JPH07837B2 - Magnesium alloy member with corrosion resistant structure - Google Patents
Magnesium alloy member with corrosion resistant structureInfo
- Publication number
- JPH07837B2 JPH07837B2 JP62086097A JP8609787A JPH07837B2 JP H07837 B2 JPH07837 B2 JP H07837B2 JP 62086097 A JP62086097 A JP 62086097A JP 8609787 A JP8609787 A JP 8609787A JP H07837 B2 JPH07837 B2 JP H07837B2
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- JP
- Japan
- Prior art keywords
- magnesium alloy
- base material
- corrosion
- weight
- synthetic resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Description
【発明の詳細な説明】 A.発明の目的 （１） 産業上の利用分野 本発明は、耐食構造を有するマグネシウム合金部材に関
する。DETAILED DESCRIPTION OF THE INVENTION A. Purpose of the Invention (1) Field of Industrial Application The present invention relates to a magnesium alloy member having a corrosion resistant structure.
（２） 従来の技術 従来、この種部材として、マグネシウム合金より構成さ
れた基材と、耐食性改善のため基材の全表面に陽極酸化
処理により形成された酸化皮膜と、その酸化皮膜の、基
材に取付けられる異種金属部材との当接面を除いた部分
にスプレー塗装等の一般塗装により形成された合成樹脂
塗膜とを備えたものが知られている。(2) Conventional Technology Conventionally, as this kind of member, a base material made of a magnesium alloy, an oxide film formed by anodizing on the entire surface of the base material for improving corrosion resistance, and a base material of the oxide film are used. There is known one provided with a synthetic resin coating film formed by general coating such as spray coating on a portion excluding a contact surface with a dissimilar metal member attached to a material.
（３） 発明が解決しようとする問題点 しかしながら、従来のマグネシウム合金、したがって基
材は耐食性の点で、未だ不十分であり、また酸化皮膜
は、一般塗装による合成樹脂塗膜との密着性がそれ程良
くないので合成樹脂塗膜の剥離のおそれがあり、さらに
異種金属部材との当接面において、酸化皮膜は無数の微
小孔を有するので、その酸化皮膜だけでは基材と異種金
属部材との間に発生を電食を確実に回避することができ
ず、その上陽極酸化処理を基材全体に施すことはその処
理が割高であるため部材の製造コストが高くなるといっ
た問題がある。(3) Problems to be Solved by the Invention However, the conventional magnesium alloy, and therefore the base material, is still insufficient in terms of corrosion resistance, and the oxide film has poor adhesion to the synthetic resin coating film by general coating. Since it is not so good, there is a risk of peeling of the synthetic resin coating film, and since the oxide film has innumerable minute pores on the contact surface with the dissimilar metal member, the oxide film alone will not separate the base material and dissimilar metal member. In the meantime, electrolytic corrosion cannot be reliably avoided, and in addition, performing the anodizing treatment on the entire substrate causes a problem that the manufacturing cost of the member becomes high because the treatment is expensive.
本発明は前記問題を解決することのできる、前記耐食構
造を有するマグネシウム合金部材を提供することを目的
とする。It is an object of the present invention to provide a magnesium alloy member having the corrosion resistant structure, which can solve the above problems.
B.発明の構成 （１） 問題点を解決するための手段 本発明は、耐食性マグネシウム合金より構成された基材
と、該基材の表面に皮膜化成処理により形成された化成
皮膜と、該化成皮膜の表面に電着塗装により形成された
合成樹脂塗膜とを備え、前記マグネシウム合金は、Al
5.7〜6.3重量％、Mn 0.15〜0.45重量％、および不可避
不純物を含むMgよりなり、前記不可避不純物のうち、F
e、CuおよびNiについて、Mn/Feの重量比を20以上に、ま
たCuの含有量を0.025重量％以下に、さらにNiの含有量
を0.004重量％以下にそれぞれ設定したことを特徴とす
る。B. Structure of the Invention (1) Means for Solving Problems The present invention is directed to a base material composed of a corrosion-resistant magnesium alloy, a chemical conversion coating formed on the surface of the base material by a chemical conversion treatment, and the chemical conversion coating. The surface of the coating is provided with a synthetic resin coating film formed by electrodeposition coating, the magnesium alloy, Al
5.7 to 6.3% by weight, Mn 0.15 to 0.45% by weight, and Mg containing inevitable impurities.
With respect to e, Cu and Ni, the Mn / Fe weight ratio is set to 20 or more, the Cu content is set to 0.025 wt% or less, and the Ni content is set to 0.004 wt% or less.
また本発明は、耐食性マグネシウム合金より構成された
基材と、該基材の、それに取付けられる異種金属部材と
の当接面に陽極酸化処理により形成された酸化皮膜と、
該酸化皮膜の表面に電着塗装により形成された合成樹脂
塗膜とを備え、前記マグネシウム合金は、Al 5.7〜6.3
重量％、Mn 0.15〜0.45重量％、および不可避不純物を
含むMgよりなり、前記不可避不純物のうち、Fe、Cuおよ
びNiについて、Mn/Feの重量比を20以上に、またCuの含
有量を0.0025重量％以下に、さらにNiの含有量を0.004
重量％以下にそれぞれ設定したことを特徴とする。Further, the present invention, a base material composed of a corrosion-resistant magnesium alloy, and an oxide film formed by an anodizing treatment on the contact surface of the base material with a dissimilar metal member attached thereto,
The surface of the oxide film is provided with a synthetic resin coating film formed by electrodeposition coating, the magnesium alloy, Al 5.7 ~ 6.3
% By weight, Mn 0.15 to 0.45% by weight, and Mg containing inevitable impurities. Among the inevitable impurities, for Fe, Cu and Ni, the weight ratio of Mn / Fe is 20 or more, and the content of Cu is 0.0025. If the content of Ni is 0.004% or less,
It is characterized in that it is set to be less than or equal to weight%.
（２） 作用 第１の発明において、前記組成のマグネシウム合金、し
たがって基材は、優れた引張強さと、比較的高い耐力を
有し、また伸び、衝撃値および硬度も適当であり、その
上優れた耐食性を有する。(2) Action In the first invention, the magnesium alloy having the above composition, and hence the base material, has excellent tensile strength and relatively high yield strength, and also has suitable elongation, impact value and hardness, and is excellent. Has corrosion resistance.
前記合金において、Alは引張強さおよび耐力を向上させ
る効果を有する。たゞし、その含有量が5.7重量％を下
回ると、伸び特性は良くなるが、引張強さおよび耐力と
いった強度特性が十分ではなくなり、一方、6.3重量％
を上回ると、伸びの低下が著しく、また衝撃値も低くな
る。In the alloy, Al has the effect of improving tensile strength and proof stress. However, when the content is less than 5.7% by weight, the elongation properties are improved, but the strength properties such as tensile strength and proof stress are not sufficient, while 6.3% by weight
Above 0, the elongation is significantly reduced and the impact value is also reduced.
またMnは耐食性を改善する効果を有する。たゞし、その
含有量が0.15重量％を下回ると、耐食性改善効果が少な
く、一方、0.45重量％を上回ると、伸び率が低下する。In addition, Mn has an effect of improving corrosion resistance. However, if its content is less than 0.15% by weight, the effect of improving the corrosion resistance is small, while if it exceeds 0.45% by weight, the elongation rate decreases.
さらに、FeはMnとの関連において、またCuおよびNiはそ
れぞれ単独で耐食性に影響を与える化学成分であり、Mn
/Feの重量比が20を下回り、またCuおよびNiの含有量が
0.025重量％、0.004重量％をそれぞれ上回ると、耐食性
が悪化する。In addition, Fe is a chemical component that affects corrosion resistance in the context of Mn, and Cu and Ni are Mn alone.
/ Fe weight ratio is less than 20, and Cu and Ni contents are
If it exceeds 0.025% by weight and 0.004% by weight, respectively, the corrosion resistance deteriorates.
前記基材表面に形成される化成皮膜は、その基材および
合成樹脂塗膜との密着性が良好であり、その上、合成樹
脂塗膜は電気的作用により形成されるので、複雑な形状
部分も均一な厚さを以て確実に隠蔽し、これにより密着
力の強固な耐食性保護膜を構成することができる。しか
も、皮膜化成処理は割安であるから、部材の製造コスト
を安価にすることができる。The chemical conversion film formed on the surface of the base material has good adhesion to the base material and the synthetic resin coating film, and further, the synthetic resin coating film is formed by an electric action, so that the complex shaped portion Even with a uniform thickness, it is possible to form a corrosion-resistant protective film having a strong adhesive force. Moreover, since the film chemical conversion treatment is inexpensive, the manufacturing cost of the member can be reduced.
また第２の発明において、基材は前記同様の物性を有す
る。また酸化皮膜を耐食性だけでなく、比較的高い強度
を有するので、基材の異種金属部材との当接面を強化す
ることができる。さらに電気的作用により形成された合
成樹脂塗膜は酸化皮膜の表面を均一な厚さを以て覆うと
共にその酸化皮膜の無数の微小孔を埋めて封孔を行うの
で、それら微小孔によるアンカー効果によって合成樹脂
塗膜の密着力を強固にすることができ、これにより優れ
た耐食性保護膜を構成して、基材と異種金属部材との間
に発生する電食を長期に亘って確実に回避することがで
きる。その上陽極酸化処理を基材の一部に施すので、部
材の製造コストの上昇を抑制することができる。In the second invention, the base material has the same physical properties as described above. Further, since the oxide film has not only corrosion resistance but also relatively high strength, the contact surface of the base material with the dissimilar metal member can be strengthened. Furthermore, the synthetic resin coating film formed by electrical action covers the surface of the oxide film with a uniform thickness and fills innumerable micropores of the oxide film for sealing, so that the synthetic effect is achieved by the anchor effect of these micropores. The adhesion of the resin coating film can be strengthened, thereby forming an excellent corrosion-resistant protective film and reliably avoiding electrolytic corrosion generated between the base material and the dissimilar metal member for a long period of time. You can Moreover, since the anodizing treatment is performed on a part of the base material, it is possible to suppress an increase in the manufacturing cost of the member.
（３） 実施例 第１〜第３図は、耐食構造を有するマグネシウム合金部
材としての車両用ホイール１を示し、そのホイール１の
中心部において車体内側方へ突出するボス部２の端壁３
外面に、異種金属部材としての鋳鉄製ブレーキディスク
４の環状取付部５および鋳鉄製ハブ６の取付フランジ部
７がこの順に重合され、取付フランジ部７に突設されて
取付部５および端壁３を貫通する複数のボルト８にナッ
ト９を螺着することにより、ホイール１、ブレーキディ
スク４およびおハブ６が一体に結合される。(3) Embodiments FIGS. 1 to 3 show a vehicle wheel 1 as a magnesium alloy member having a corrosion resistant structure, and an end wall 3 of a boss portion 2 projecting inward of the vehicle body at the center of the wheel 1.
On the outer surface, the annular mounting portion 5 of the cast iron brake disc 4 as the dissimilar metal member and the mounting flange portion 7 of the cast iron hub 6 are superposed in this order, and the mounting flange portion 7 and the mounting portion 5 and the end wall 3 are projected. The wheel 1, the brake disc 4, and the hub 6 are integrally connected by screwing a nut 9 onto a plurality of bolts 8 penetrating through.
端壁３の各ボルト挿通孔10にブシュ11が螺着され、それ
らボルト挿通孔10の摩耗を防止するようになっている。
Ｓはブシュ11およびボルト挿通孔10間の間隙をシールす
るシール剤である。Bushings 11 are screwed into the bolt insertion holes 10 of the end wall 3 to prevent the bolt insertion holes 10 from being worn.
S is a sealant that seals the gap between the bush 11 and the bolt insertion hole 10.
ホイール１は、鋳造法を適用して耐食性マグネシウム合
金より構成された、ホイール１と同一形状の基材12を有
し、その基材12の表面に後述する耐食性保護膜が設けら
れる。The wheel 1 has a base material 12 made of a corrosion-resistant magnesium alloy by a casting method and having the same shape as that of the wheel 1, and a corrosion-resistant protective film described later is provided on the surface of the base material 12.
耐食性アルミニウム合金は、Al 5.7〜6.3重量％、Mn 0.
15〜0.45重量％、および不可避不純物を含むMgよりな
り、前記不可避不純物のうち、Fe、CuおよびNiについ
て、Mn/Feの重量比は20以上に、またCuの含有量は0.025
重量％以下に、さらにNiの含有量は0.004重量％以下に
それぞれ設定される。Corrosion resistant aluminum alloy, Al 5.7 ~ 6.3 wt%, Mn 0.
15 to 0.45 wt%, and consisting of Mg containing unavoidable impurities, of the unavoidable impurities, for Fe, Cu and Ni, the weight ratio of Mn / Fe is 20 or more, and the content of Cu is 0.025.
The content of Ni is set to 0.004% by weight or less, and the Ni content is set to 0.004% by weight or less.
第４図は、0.22重量％Mnおよび前記不可避不純物を含有
するマグネシウム合金において、Al含有量を変化させた
場合を示し、Al含有量を5.7〜6.3重量％に設定すること
により、前記合金、したがって基材12は、優れた引張強
さと、比較的高い耐力を有し、また伸び、衝撃値および
硬度も適当になる。FIG. 4 shows the case where the Al content was changed in a magnesium alloy containing 0.22 wt% Mn and the unavoidable impurities. By setting the Al content to 5.7 to 6.3 wt%, The substrate 12 has excellent tensile strength and relatively high yield strength, and also has suitable elongation, impact value and hardness.
第５図に明示するように、ホイール１の端壁３外面、し
たがって基材12におけるブレーキディスク４との当接面
13（第６図）およびその近傍を除く基材12表面に、皮膜
化成処理により形成された化成皮膜14と、その化成皮膜
14の表面に電着塗装により形成された合成樹脂塗膜15と
が設けられる。また必要に応じて合成樹脂塗膜15の表面
に、プライマサフェーサ等による中塗り層161、メタリ
ック塗料等による上塗り層162および透明塗料等による
層163を備えた装飾塗膜16が形成される。As clearly shown in FIG. 5, the outer surface of the end wall 3 of the wheel 1, and thus the contact surface of the base material 12 with the brake disc 4.
A chemical conversion coating 14 formed by a chemical conversion coating on the surface of the base material 12 excluding 13 (FIG. 6) and its vicinity, and the chemical conversion coating.
A synthetic resin coating film 15 formed by electrodeposition coating is provided on the surface of 14. If necessary, a decorative coating film 16 having an intermediate coating layer 16 1 made of primer surfacer, an overcoat layer 16 2 made of metallic paint, etc. and a layer 16 3 made of transparent paint etc. is formed on the surface of the synthetic resin coating film 15. It
マグネシウム合金の場合、基材12の腐食が始まると、そ
の腐食部分はアルカリ性になるので、前記電着塗装とし
ては、耐アルカリ性の良好なエポキシ系のカチオン電着
塗装が良い。In the case of a magnesium alloy, when corrosion of the base material 12 starts, the corroded portion becomes alkaline. Therefore, as the electrodeposition coating, epoxy-based cationic electrodeposition coating having good alkali resistance is preferable.
前記基材12表面に形成される化成皮膜15は、その基材12
および合成樹脂塗膜15との密着性が良好であり、その
上、合成樹脂塗膜15は電気的作用により形成されるの
で、複雑な形状部分も均一な厚さを以て確実に隠蔽し、
これにより密着力の強固な耐食性保護膜を構成すること
ができる。しかも、皮膜化成処理は割安であるから、ホ
イール１の製造コストを安価にすることができる。The chemical conversion film 15 formed on the surface of the substrate 12 is the substrate 12
And the adhesiveness with the synthetic resin coating film 15 is good, and furthermore, since the synthetic resin coating film 15 is formed by an electrical action, even a complicated shape portion is surely hidden with a uniform thickness,
This makes it possible to form a corrosion-resistant protective film having strong adhesion. Moreover, since the film chemical conversion treatment is inexpensive, the manufacturing cost of the wheel 1 can be reduced.
また第６図に明示するように、基材12におけるブレーキ
ディスク４との当接面13およびその近傍には陽極酸化処
理により形成された酸化皮膜17と、その酸化皮膜17の表
面に電着塗装により形成された合成樹脂塗膜15とが設け
られる。Further, as clearly shown in FIG. 6, an oxide film 17 formed by anodizing on the contact surface 13 of the base material 12 with the brake disc 4 and its vicinity, and the surface of the oxide film 17 by electrodeposition coating. And a synthetic resin coating film 15 formed by.
前記のように、基材12の当接面13に酸化皮膜17を形成す
ると、その酸化皮膜17が耐食性だけでなく、化成皮膜15
に比べて高い強度を有するので、当接面13を強化するこ
とができる。また電気的作用により形成された合成樹脂
塗膜15は酸化皮膜17の表面を覆うと共にその酸化皮膜17
の無数の微小孔18を埋めて封孔を行うので、それら微小
孔18によるアンカー効果によって合成樹脂塗膜15の密着
力を強固することができ、これにより優れた耐食性保護
膜を構成して、基材12とブレーキディスク４との間に発
生する電食を長期に亘って確実に回避することができ
る。その上陽極酸化処理を基材12の一部に施すので、ホ
イール１の製造コストの上昇を抑制することができる。As described above, when the oxide film 17 is formed on the contact surface 13 of the base material 12, the oxide film 17 has not only the corrosion resistance but also the chemical conversion film 15
The contact surface 13 can be strengthened because it has a higher strength than the contact surface 13. Further, the synthetic resin coating film 15 formed by the electric action covers the surface of the oxide film 17 and the oxide film 17
Since the innumerable micropores 18 are filled and sealed, the adhesion of the synthetic resin coating film 15 can be strengthened by the anchoring effect of the micropores 18, thereby forming an excellent corrosion-resistant protective film, It is possible to reliably avoid electrolytic corrosion generated between the base material 12 and the brake disc 4 for a long period of time. In addition, since the anodizing treatment is performed on a part of the base material 12, it is possible to suppress an increase in the manufacturing cost of the wheel 1.
前記ホイール１は以下の工程を経て製造される。The wheel 1 is manufactured through the following steps.
即ち、基材12の真空ダイカスト工程（必要に応じて鋳肌
の除去）→基材12に対する脱脂工程→基材12の当接面13
およびその近傍をマスキングして行われる皮膜化成処理
工程→マスキングを外して行われる陽極酸化処理工程→
陽極酸化処理により得られた酸化皮膜17の封孔処理を兼
ねた電着塗装工程→装飾塗膜16の形成工程である。That is, the vacuum die-casting process of the base material 12 (removal of the casting surface if necessary) → the degreasing process for the base material → the contact surface 13 of the base material 12
And the film formation treatment process performed by masking the vicinity of it → Anodizing treatment process performed by removing the masking →
The process is an electrodeposition coating process that also serves as a sealing treatment for the oxide film 17 obtained by anodizing process → the process of forming the decorative coating film 16.
前記真空ダイカストは、注湯温度 700℃、圧力 750kg
/cm2、型予熱温度 150℃の条件の下に行われる。The vacuum die casting is a pouring temperature of 700 ℃ and a pressure of 750kg.
/ cm 2 , mold preheating temperature 150 ℃.
皮膜化成処理は、重クロム酸塩 150〜200g/l、硝酸塩
150〜200g/l、アンモニウム塩 10〜20g/l等を含む、
常温の処理液に基材12を30〜60秒間浸漬することにより
行われる。Film chemical conversion treatment is dichromate 150-200g / l, nitrate
150-200g / l, including ammonium salt 10-20g / l,
It is performed by immersing the base material 12 in a treatment liquid at room temperature for 30 to 60 seconds.
陽極酸化処理は、NaOH（またはKOH）100〜200g/l、Al塩
20〜50g/l、Cr塩 10〜30g/l、カルボン酸塩 20〜60
g/l等を含む、常温の処理液に基材12を浸漬し、電流密
度１〜3A/dm2、電圧20Vの条件の下に行われる。Anodizing treatment is NaOH (or KOH) 100-200g / l, Al salt
20-50g / l, Cr salt 10-30g / l, carboxylate 20-60
The substrate 12 is immersed in a treatment liquid at room temperature containing g / l or the like, and the treatment is performed under conditions of a current density of 1 to 3 A / dm 2 and a voltage of 20V.
電着塗装は、エポキシ系樹脂分 19重量％を含む、約26
℃の弱酸性浴に基材12を浸漬し、電着電圧200Vの条件の
下に行われる。The electrodeposition coating contains about 26% by weight of epoxy resin, about 26
The substrate 12 is immersed in a weak acid bath at 0 ° C., and the electrodeposition voltage is 200 V.
前記のように酸化皮膜17の封孔処理を電着塗装工程で行
うと、封孔および塗装を別工程で行う場合に比べて作業
工数を半減することができ、また塗膜が連続するので耐
食性を向上させる上に有効である。When the sealing treatment of the oxide film 17 is performed in the electrodeposition coating process as described above, the number of working steps can be reduced by half compared to the case where the sealing and coating are performed in separate processes, and the coating film is continuous, so corrosion resistance Is effective in improving.
次に、基材12、したがってマグネシウム合金の腐食性
と、その合金に含有される不可避不純物のうちFe、Cuお
よびNiの含有量との関係について説明する。なお、Feは
Mnとの関連において前記合金の腐食性に影響を与えるの
で、Mn/Feの重量比として考察する。Next, the relationship between the corrosiveness of the base material 12, that is, the magnesium alloy, and the contents of Fe, Cu, and Ni among the unavoidable impurities contained in the alloy will be described. Note that Fe is
Since it affects the corrosiveness of the alloy in relation to Mn, it is considered as a weight ratio of Mn / Fe.
試験片としては、各種マグネシウム合金を用いて真空ダ
イカストにより得られた鋳造体の表面に、前記化成皮膜
14および前記合成樹脂塗膜15を順次形成したものを用い
る。As the test piece, the above-mentioned chemical conversion film was formed on the surface of the cast body obtained by vacuum die casting using various magnesium alloys.
14 and the synthetic resin coating film 15 are sequentially formed and used.
腐食試験は、試験片の合成樹脂塗膜15にクロスカット傷
を付け、温度35℃の雰囲気下でクロスカット傷に塩水を
噴霧することにより行われる（JIS Z2371）。The corrosion test is performed by making cross-cut scratches on the synthetic resin coating film 15 of the test piece and spraying salt water on the cross-cut scratches in an atmosphere at a temperature of 35 ° C. (JIS Z2371).
第７図は、Al 5.9重量％、Ni 0.001重量％以下、Cu 0.0
15重量％以下ならびにMnおよびFeを含有するマグネシウ
ム合金において、MnおよびFeの含有量を変化させた場合
いて、MnおよびFeの含有量を変化させた場合を示す。第
７図から明らかなようにMn/Feの重量比を20以上に設定
することによって、良好な耐食性を得ることができる。
前記腐食試験において、クロスカット傷から2mmの位置
まで腐食が進行する時間を求めたところ、第７図におい
て、点ａでは216時間、点ｂでは456〜768時間、点ｃで
は768〜960時間、点ｄでは1008時間以上、点ｅでは792
〜1080時間であることが判明している。Figure 7 shows Al 5.9 wt%, Ni 0.001 wt% or less, Cu 0.0
In a magnesium alloy containing 15% by weight or less and containing Mn and Fe, the case where the contents of Mn and Fe are changed and the cases where the contents of Mn and Fe are changed are shown. As is clear from FIG. 7, by setting the Mn / Fe weight ratio to 20 or more, good corrosion resistance can be obtained.
In the corrosion test, the time required for the corrosion to progress from the cross-cut scratch to the position of 2 mm was determined. In FIG. 7, the point a was 216 hours, the point b was 456 to 768 hours, and the point c was 768 to 960 hours. 1008 hours or more at point d, 792 at point e
It turns out to be ~ 1080 hours.
第８図は、Al 5.9重量％、Mn 0.22重量％、Fe 0.005重
量％（Mn/Feの重量比 44）、Ni 0.001重量％以下およ
びCuを含有するマグネシウム合金において、Cuの含有量
を変化させた場合を示す。第８図から明らかなように、
Cuの含有量を0.025重量％以下に設定することによっ
て、良好な耐食性を得ることができる。Fig. 8 shows that the content of Cu was changed in the magnesium alloy containing Al 5.9 wt%, Mn 0.22 wt%, Fe 0.005 wt% (Mn / Fe weight ratio 44), Ni 0.001 wt% or less and Cu. It shows the case. As is clear from FIG.
Good corrosion resistance can be obtained by setting the content of Cu to 0.025% by weight or less.
第９図は、Al 5.9重量％、Mn 0.22重量％、Fe 0.003重
量％（Mn/Feの重量比 薬73.3）、Cu 0.015重量％以下
およびNiを含有するマグネシウム合金において、Niの含
有量を変化させた場合を示す。第９図から明らかなよう
に、Niの含有量を0.004重量％以下に設定することによ
って、良好な耐食性を得ることができる。Figure 9 shows changes in the Ni content in magnesium alloys containing Al 5.9 wt%, Mn 0.22 wt%, Fe 0.003 wt% (Mn / Fe weight ratio 73.3), Cu 0.015 wt% or less and Ni. The following shows the case where it is allowed. As is clear from FIG. 9, good corrosion resistance can be obtained by setting the Ni content to 0.004% by weight or less.
電着塗装および陽極酸化処理において、基材12のエッジ
部では合成樹脂塗膜15および酸化皮膜17の厚さが薄くな
る傾向がある。これはエッジ部の円弧面の半径Ｒと密接
な関係があり、そこで種々検討したところ、半径Ｒを0.
5mm以上、好ましくは0.8mm以上に設定することによって
耐食性を確保し得る厚さの合成樹脂塗膜15および酸化皮
膜17を形成することができることを究明した。In the electrodeposition coating and anodizing treatment, the synthetic resin coating film 15 and the oxide film 17 tend to be thin at the edge portion of the base material 12. This has a close relationship with the radius R of the arc surface of the edge part, and various studies were conducted there to find that the radius R was 0.
By setting the thickness to 5 mm or more, preferably 0.8 mm or more, it was found that the synthetic resin coating film 15 and the oxide film 17 having a thickness capable of ensuring corrosion resistance can be formed.
第10図はエッジ部における円弧面の半径Ｒと、合成樹脂
塗膜15の厚さとの関係を示し、半径Ｒが0.5mm以上であ
れば、基材12の平坦面部と略同等の厚さの合成樹脂塗膜
15を得ることができる。たゞし半径Ｒが0.5mmを下回る
と、合成樹脂塗膜15の厚さが薄くなって基材12の腐食が
進行し、その腐食部分のアルカリ性に起因して多数の糸
錆が発生する。FIG. 10 shows the relationship between the radius R of the circular arc surface at the edge portion and the thickness of the synthetic resin coating film 15. If the radius R is 0.5 mm or more, the thickness of the flat surface portion of the base material 12 is approximately the same. Synthetic resin coating
You can get 15. However, if the radius R is less than 0.5 mm, the thickness of the synthetic resin coating film 15 becomes thin, and the corrosion of the base material 12 progresses, causing a lot of thread rust due to the alkalinity of the corroded portion.
円弧面の形成は、金型に円弧面を付して行う。機械加工
により行う。またはスコッチブライト、サンドペーパ等
を用いて手作業により行う。The arc surface is formed by attaching the arc surface to the mold. It is done by machining. Alternatively, it is done manually using Scotch bright, sand paper, etc.
なお、前記ホイールにおいて、異種金属部材がハブであ
る場合もある。また本発明はホイールに限らず、他の部
材にも適用される。In the wheel, the dissimilar metal member may be a hub. Further, the present invention is not limited to the wheel and is applied to other members.
C.発明の効果 マグネシウム合金の組成の前記限定に基づいて優れた機
械的強度および耐食性を発揮する基材と、その基材の表
面を確実に覆い、また密着力の強固な耐食性保護膜、即
ち化成皮膜および合成樹脂塗膜とを備えた、耐食構造を
有するマグネシウム合金部材を提供することができる。
また皮膜化成処理は割安であるから、前記部材の製造コ
ストを安価にすることができる。C. Effect of the invention Based on the above-mentioned limitation of the composition of the magnesium alloy, the base material that exhibits excellent mechanical strength and corrosion resistance, and the surface of the base material is surely covered, and the corrosion resistance protective film having a strong adhesion, that is, It is possible to provide a magnesium alloy member having a corrosion resistant structure, which is provided with a chemical conversion film and a synthetic resin coating film.
Further, since the film chemical conversion treatment is inexpensive, the manufacturing cost of the member can be reduced.
第２の発明によれば、マグネシウム合金の組成の前記限
定に基づいて優れた機械的強度および耐食性を発揮する
基材と、その基材の表面を確実に覆い、また密着力の強
固な耐食性保護膜、即ち、酸化皮膜および合成樹脂塗膜
とを備え、基材とそれに取付けられる異種金属部材との
間に発生する電食を確実に回避することのできる、耐食
構造を備えたマグネシウム合金部材を提供することがで
きる。また陽極酸化処理は基材の一部に施されるだけで
あるから、前記部材の製造コストの上昇を抑制すること
ができる。According to the second invention, a base material that exhibits excellent mechanical strength and corrosion resistance based on the above-mentioned limitation of the composition of the magnesium alloy, and a surface of the base material is surely covered, and the adhesion strength is strong and the corrosion resistance is protected. A magnesium alloy member provided with a film, that is, an oxide film and a synthetic resin coating film, capable of reliably avoiding electrolytic corrosion generated between a base material and a dissimilar metal member attached thereto, and a magnesium alloy member having a corrosion resistant structure. Can be provided. Further, since the anodizing treatment is performed only on a part of the base material, it is possible to suppress an increase in the manufacturing cost of the member.
第１ないし第３図は車両用ホイールを示し、第１図は縦
断正面図、第２図は第１図II矢視図、第３図は要部拡大
図、第４図はマグネシウム合金のAl含有量と機械的強度
との関係を示すグラフ、第５図は第３図Ｖ矢示部の拡大
図、第６図は第３図VI矢示部の拡大図、第７図は耐食性
保護膜を有するマグネシウム合金のMn/Feの重量比と腐
食速度との関係を示すグラフ、第８図は耐食性保護膜を
有するマグネシウム合金のCu含有量と腐食速度との関係
を示すグラフ、第９図は耐食性保護膜を有するマグネシ
ウム合金のNi含有量と腐食速度との関係を示すグラフ、
第10図は基材のエッジ部における円弧面の半径と合成樹
脂塗膜の厚さとの関係を示すグラフである。 ４……異種金属部材としてのブレーキディスク、12……
基材、13……当接面、14……化成皮膜、15……合成樹脂
塗膜、17……酸化皮膜1 to 3 show a vehicle wheel, FIG. 1 is a longitudinal front view, FIG. 2 is a view taken in the direction of arrow II of FIG. 1, FIG. 3 is an enlarged view of a main part, and FIG. 4 is a magnesium alloy Al. A graph showing the relationship between the content and the mechanical strength, FIG. 5 is an enlarged view of an arrow V in FIG. 3, FIG. 6 is an enlarged view of an arrow VI in FIG. 3, and FIG. 7 is a corrosion-resistant protective film. FIG. 8 is a graph showing the relationship between the corrosion rate and the Mn / Fe weight ratio of the magnesium alloy having the alloy, FIG. 8 is a graph showing the relationship between the Cu content and the corrosion rate of the magnesium alloy having the corrosion resistant protective film, and FIG. A graph showing the relationship between the Ni content and the corrosion rate of a magnesium alloy having a corrosion resistant protective film,
FIG. 10 is a graph showing the relationship between the radius of the arc surface at the edge portion of the base material and the thickness of the synthetic resin coating film. 4 …… Brake disc as a dissimilar metal member, 12 ……
Base material, 13 ... Contact surface, 14 ... Chemical conversion coating, 15 ... Synthetic resin coating, 17 ... Oxide coating
Claims (4)
材と、該基材の表面に皮膜化成処理により形成された化
成皮膜と、該化成皮膜の表面に電着塗装により形成され
た合成樹脂塗膜とを備え、前記マグネシウム合金は、Al
5.7〜6.3重量％、Mn 0.15〜0.45重量％、および不可避
不純物を含むMgよりなり、前記不可避不純物のうち、F
e、CuおよびNiについて、Mn/Feの重量比を20以上に、ま
たCuの含有量を0.025重量％以下に、さらにNiの含有量
を0.004重量％以下にそれぞれ設定したことを特徴とす
る耐食構造を有するマグネシウム合金部材。1. A base material composed of a corrosion-resistant magnesium alloy, a chemical conversion film formed on the surface of the base material by a chemical conversion treatment, and a synthetic resin coating film formed on the surface of the chemical conversion film by electrodeposition coating. And the magnesium alloy is Al
5.7 to 6.3% by weight, Mn 0.15 to 0.45% by weight, and Mg containing inevitable impurities.
For e, Cu and Ni, the corrosion resistance is characterized by setting the weight ratio of Mn / Fe to 20 or more, the content of Cu to 0.025% by weight or less, and the content of Ni to 0.004% by weight or less. A magnesium alloy member having a structure.
ールである、特許請求の範囲第（１）項記載の耐食構造
を有するマグネシウム合金部材。2. The magnesium alloy member having a corrosion resistant structure according to claim 1, which is a vehicle wheel.
材と、該基材の、それに取付けられる異種金属部材との
当接面に陽極酸化処理により形成された酸化皮膜と、該
酸化皮膜の表面に電着塗装により形成された合成樹脂塗
膜とを備え、前記マグネシウム合金は、Al 5.7〜6.3重
量％、Mn 0.15〜0.45重量％、および不可避不純物を含
むMgよりなり、前記不可避不純物のうち、Fe、Cuおよび
Niについて、Mn/Feの重量比を20以上に、またCuの含有
量を0.025重量％以下に、さらにNiの含有量を0.004重量
％以下にそれぞれ設定したことを特徴とする耐食構造を
有するマグネシウム合金部材。3. A base material composed of a corrosion-resistant magnesium alloy, an oxide film formed by anodizing on the contact surface of the base material with a dissimilar metal member attached thereto, and a surface of the oxide film. A synthetic resin coating film formed by electrodeposition coating, wherein the magnesium alloy consists of Al 5.7 ~ 6.3 wt%, Mn 0.15 ~ 0.45 wt%, and Mg containing inevitable impurities, of the inevitable impurities, Fe , Cu and
Regarding Ni, magnesium having a corrosion-resistant structure characterized in that the weight ratio of Mn / Fe is set to 20 or more, the content of Cu is set to 0.025% by weight or less, and the content of Ni is set to 0.004% by weight or less. Alloy material.
ールである、特許請求の範囲第（３）項記載の耐食構造
を有するマグネシウム合金部材。4. The magnesium alloy member having a corrosion resistant structure according to claim 3, which is a vehicle wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62086097A JPH07837B2 (en) | 1987-04-08 | 1987-04-08 | Magnesium alloy member with corrosion resistant structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62086097A JPH07837B2 (en) | 1987-04-08 | 1987-04-08 | Magnesium alloy member with corrosion resistant structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63250498A JPS63250498A (en) | 1988-10-18 |
| JPH07837B2 true JPH07837B2 (en) | 1995-01-11 |
Family
ID=13877202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62086097A Expired - Fee Related JPH07837B2 (en) | 1987-04-08 | 1987-04-08 | Magnesium alloy member with corrosion resistant structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07837B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009140147A1 (en) * | 2008-05-12 | 2009-11-19 | Gm Global Technology Operations, Inc. | Corrosion isolation of magnesium components |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0895875A1 (en) * | 1997-02-26 | 1999-02-10 | WASHI KOSAN Company Limited | Magnesium alloy wheel for vehicle |
| JPH10236101A (en) * | 1997-02-26 | 1998-09-08 | Washi Kosan Kk | Assembled magnesium alloy wheel |
| US6335099B1 (en) | 1998-02-23 | 2002-01-01 | Mitsui Mining And Smelting Co., Ltd. | Corrosion resistant, magnesium-based product exhibiting luster of base metal and method for producing the same |
| JP2003055795A (en) * | 2001-08-10 | 2003-02-26 | Niigata Prefecture | Method for producing thin product made of magnesium alloy |
| KR101167155B1 (en) | 2004-12-24 | 2012-07-24 | 재단법인 포항산업과학연구원 | Method for improving the corrosion resistance of magnesium melting crucible |
| JP5191722B2 (en) * | 2006-11-16 | 2013-05-08 | ヤマハ発動機株式会社 | Magnesium alloy member and manufacturing method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6253018A (en) * | 1985-09-02 | 1987-03-07 | Toshiba Corp | Semiconductor protection device |
-
1987
- 1987-04-08 JP JP62086097A patent/JPH07837B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009140147A1 (en) * | 2008-05-12 | 2009-11-19 | Gm Global Technology Operations, Inc. | Corrosion isolation of magnesium components |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63250498A (en) | 1988-10-18 |
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