JPH0735105B2 - Anticorrosion steel plate for automobile exterior with excellent low temperature chipping - Google Patents
Anticorrosion steel plate for automobile exterior with excellent low temperature chippingInfo
- Publication number
- JPH0735105B2 JPH0735105B2 JP62236690A JP23669087A JPH0735105B2 JP H0735105 B2 JPH0735105 B2 JP H0735105B2 JP 62236690 A JP62236690 A JP 62236690A JP 23669087 A JP23669087 A JP 23669087A JP H0735105 B2 JPH0735105 B2 JP H0735105B2
- Authority
- JP
- Japan
- Prior art keywords
- low temperature
- film layer
- steel plate
- organic resin
- temperature chipping
- 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.)
- Expired - Fee Related
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 27
- 239000010959 steel Substances 0.000 title claims description 27
- 239000010410 layer Substances 0.000 claims description 46
- 238000007747 plating Methods 0.000 claims description 27
- 239000011347 resin Substances 0.000 claims description 26
- 229920005989 resin Polymers 0.000 claims description 26
- 239000000956 alloy Substances 0.000 claims description 19
- 229910045601 alloy Inorganic materials 0.000 claims description 19
- 239000011247 coating layer Substances 0.000 claims description 6
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 5
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- 239000010452 phosphate Substances 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 description 22
- 238000000576 coating method Methods 0.000 description 22
- 239000011701 zinc Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- 229910007567 Zn-Ni Inorganic materials 0.000 description 6
- 229910007614 Zn—Ni Inorganic materials 0.000 description 6
- 238000004070 electrodeposition Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 6
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 5
- 239000004593 Epoxy Substances 0.000 description 4
- 239000004925 Acrylic resin Substances 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 230000003449 preventive effect Effects 0.000 description 3
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229930185605 Bisphenol Natural products 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Chemical Treatment Of Metals (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は低温チッピング性に優れた自動車外面用防錆鋼
板に関するもので、さらに詳しくは、自動車外板の外面
用として必要な低温チッピング性に優れた防錆鋼板に関
する。Description: TECHNICAL FIELD The present invention relates to a rust preventive steel sheet for automobile outer surfaces, which is excellent in low temperature chipping property, and more specifically, to a low temperature chipping property required for outer surface of automobile outer plates. It relates to an excellent rustproof steel plate.
［従来技術］ 自動車外板の外面にZn系合金めっきを適用については、
ここ数年急速に進められてきており、欧州また北アメリ
カ等の寒冷地域では岩塩と混合して散布される小石が自
動車外面に衝突して、塗膜だけではなくめっき層と素地
鋼板との間が剥離するという問題が発生した（低温チッ
ピング性）。[Prior Art] Regarding the application of Zn-based alloy plating to the outer surface of an automobile outer plate,
In the cold regions of Europe and North America, pebbles mixed with rock salt and sprayed collide with the outer surface of the automobile, and not only between the coating film but also between the plating layer and the base steel sheet, which has been rapidly progressing for several years. The problem of peeling occurred (low temperature chipping property).
この問題は、合金めっき層自体が固くて脆く、また、め
っき時の残留応力が大きいこと、さらに、自動車下地塗
装である電着塗装或いは中、上塗り塗装の焼付け時にも
可成りの収縮応力が生じるために、低温でチッピングを
受けた場合めっき層と素地界面から剥離が生じると考え
られている。This problem is that the alloy plating layer itself is hard and brittle, and the residual stress at the time of plating is large, and further, a considerable shrinkage stress occurs even when electrodeposition coating which is an automobile base coating or middle or top coating is baked. Therefore, it is considered that when chipping is performed at a low temperature, peeling occurs from the plating layer and the base material interface.
そして、この問題に対しては、主としてめっき層の残留
応力を軽減する方法の対策が採用されているのが現状で
ある。しかし、このめっき層の残留応力を軽減するため
には、めっき浴中に応力緩和剤と称する添加剤を加える
等の対策が一般的であるが、浴中添加剤によってZn系合
金めっき組成が著しく変化し、ひどい場合にはZn中に他
の合金成分が殆ど入らないという問題がある。Then, in order to solve this problem, the present situation is that a measure mainly for reducing the residual stress of the plating layer is adopted. However, in order to reduce the residual stress of this plating layer, it is common to take measures such as adding an additive called a stress relaxation agent in the plating bath, but the Zn-based alloy plating composition is significantly increased by the additive in the bath. There is a problem that it changes and, in the worst case, almost no other alloy components enter into Zn.
［発明が解決しようとする問題点］ 本発明は従来における自動車外板の外面に使用する防錆
鋼板の種々の問題点に鑑み、本発明者が鋭意研究を行
い、検討を重ねた結果、低温におけるチッピング性が極
めて良好な自動車外面用防錆鋼板を開発したのである。[Problems to be Solved by the Invention] In view of various problems of the conventional rust-preventing steel plate used for the outer surface of an automobile outer plate, the present invention has been earnestly studied and studied, and as a result, low temperature We have developed a rustproof steel plate for automobile exteriors that has extremely good chipping properties.
［問題点を解決するための手段］ 本発明に係る低温チッピング性に優れた自動車外面用防
錆鋼板の特徴とするところは、 鋼板上に10g/m2のZn系合金めっき層を設け、その上に、
クロメート処理皮膜層或いは燐酸塩処理皮膜層を設け、
さらにその上に、Tg点55℃以下で、かつ、焼付け後の常
温における硬度が鉛筆硬度のＨ〜2Bである有機樹脂皮膜
層が0.1〜2.0μｍの厚さに設けられていることにある。[Means for Solving Problems] A feature of the rust-preventive steel sheet for automobile outer surface according to the present invention that is excellent in low-temperature chipping is that a 10 g / m 2 Zn-based alloy plating layer is provided on the steel sheet, and above,
Provide a chromate treatment film layer or a phosphate treatment film layer,
Furthermore, an organic resin film layer having a Tg point of 55 ° C. or less and a hardness at the normal temperature after baking of H to 2B, which is a pencil hardness of H to 2B, is provided thereon to a thickness of 0.1 to 2.0 μm.
本発明に係る低温チッピング性に優れた自動車外面用防
錆鋼板について、以下詳細に説明する。The rust-preventive steel sheet for automobile outer surfaces having excellent low-temperature chipping properties according to the present invention will be described in detail below.
本発明に係る低温チッピング性に優れた自動車外面用防
錆鋼板においては、合板上にZn系合金めっき層、クロメ
ート処理皮膜層或いは燐酸塩処理皮膜層を順に設け、そ
の上に特定の性質を有する有機樹脂皮膜層を設けること
によって、自動車製造に際して施される下地電着塗装、
中、上塗り塗装後の収縮応力がZn系合金めっき層に直接
伝わらないのである。In the anticorrosive steel sheet for automobile outer surface excellent in low-temperature chipping property according to the present invention, a Zn-based alloy plating layer, a chromate treatment coating layer or a phosphate treatment coating layer is sequentially provided on the plywood, and has specific properties on it. By providing an organic resin film layer, base electrodeposition coating applied during automobile manufacturing,
The shrinkage stress after the middle and top coats are not directly transmitted to the Zn-based alloy plating layer.
なお、Zn系合金めっき層の付着量は、低温チッピング性
を考慮すると10g/m2以上とするのがよい。The amount of the Zn-based alloy plating layer deposited is preferably 10 g / m 2 or more in consideration of the low temperature chipping property.
本発明に係る低温チッピング性に優れた自動車外面用防
錆鋼板に使用する有機樹脂皮膜層としては、水溶性、溶
剤型等の種類には関係なく使用でき、エポキシ系、ウレ
タン系、アクリル系及びこれらの混合物が使用できる。As the organic resin film layer used in the anticorrosive steel sheet for automobile outer surface excellent in low temperature chipping property according to the present invention, water-soluble, can be used regardless of type such as solvent type, epoxy type, urethane type, acrylic type and Mixtures of these can be used.
そして、エポキシ系樹脂としては、汎用液状エポキシ樹
脂、ウレタン系樹脂では、水溶性非反応自己乳化型ウレ
タン樹脂、アクリル系樹脂では、水溶性アクリル樹脂等
が挙げられる。Examples of the epoxy-based resin include a general-purpose liquid epoxy resin, a urethane-based resin, a water-soluble non-reactive self-emulsifying urethane resin, and an acrylic resin, a water-soluble acrylic resin.
このような有機樹脂皮膜層は低温チッピング性に関与す
るものであり、その性質としては、Tg点（ガラス転位
点）が重要であり、このTg点が55℃以下でなければ効果
はない。また、有機樹脂皮膜層の厚さは0.1〜2.0μｍと
するのが良く0.1μｍ未満の厚さでは低温チッピング性
改良の効果は少なく、また、2.0μｍを越える厚さでは
低温チッピング性に効果はあるけれども、電着塗装性、
溶接性、外観仕上り性等に悪影響を及ぼすのである。ま
た、有機樹脂皮膜層の焼付け後の硬度は外面用として自
動車の各部に使用するためのプレス時に問題を生じ、即
ち、塗膜硬度が鉛筆硬度のＨを越えるとプレス時にクラ
ックが入り、特に著しい場合には剥離することがあり、
また、塗膜硬度が鉛筆硬度の2Bより軟かいとプレス時に
疵がつき易くなる。この塗膜硬度とプレス時のパウダリ
ング性の関係をドロービードテストにより評価した場合
について、第３図に示す。この第３図において、有機樹
脂皮膜層はウレタン系樹脂（２μｍ）で、下地はZn−Ni
合金めっき層（20g/m2）であり、●印は鉛筆硬度のＨ〜
2Bを外れているので有機樹脂皮膜層の疵つきが大きい。Such an organic resin film layer is involved in the low temperature chipping property, and as its property, the Tg point (glass transition point) is important, and if the Tg point is 55 ° C. or lower, there is no effect. The thickness of the organic resin film layer is preferably 0.1 to 2.0 μm, and a thickness of less than 0.1 μm has little effect on improving the low temperature chipping property, and a thickness of more than 2.0 μm has no effect on the low temperature chipping property. Although there is, electrodeposition paintability,
It has a bad influence on the weldability and appearance finish. Further, the hardness of the organic resin film layer after baking causes a problem at the time of pressing for use in various parts of an automobile for external surfaces, that is, when the coating film hardness exceeds H of the pencil hardness, cracks are generated at the time of pressing, which is particularly remarkable. In some cases, it may peel off,
Further, if the coating film hardness is lower than the pencil hardness of 2B, flaws are likely to occur during pressing. FIG. 3 shows the case where the relationship between the coating film hardness and the powdering property during pressing was evaluated by the draw bead test. In FIG. 3, the organic resin film layer is urethane resin (2 μm), and the base is Zn-Ni.
It is an alloy plating layer (20 g / m 2 ), and ● indicates pencil hardness from H to
Since it is out of 2B, the organic resin film layer is greatly damaged.
なお、従来の自動車における低温チッピング対策とし
て、下塗り電着塗装後に耐チッピング塗料を10μｍ以上
塗布するか、上塗りまで施した後に耐チッピング塗料を
10μｍ以上の厚さに塗布することが行なわれており、本
発明に係る低温チッピング性に優れた自動車外面用防錆
鋼板におけるように、有機樹脂皮膜層の厚さを0.1〜2.0
μｍのように薄く電着塗装の下層とすることは行なわれ
ていない。そして、従来の対策では欧州、北アメリカ等
の寒冷地に対してだけ、この種の塗装を施す必要がある
ことから、塗料塗り替え等の製造工程上の煩雑さは避け
ることができなかったのである。As a measure against low-temperature chipping in conventional automobiles, apply a chipping resistant coating of 10 μm or more after undercoating electrodeposition coating, or apply a chipping resistant coating after applying up to the top coating.
It is applied to a thickness of 10 μm or more, and the organic resin film layer has a thickness of 0.1 to 2.0 as in the case of the rust-preventing steel sheet for automobile outer surface excellent in low temperature chipping property according to the present invention.
It is not used as a lower layer of electrodeposition coating such as μm. Since the conventional measures need to apply this kind of coating only to cold regions such as Europe and North America, the complexity of the manufacturing process such as paint repainting cannot be avoided. .
このようなことから、本発明に係る低温チッピング性の
優れた自動車外面用防錆鋼板においては、有機樹脂皮膜
層を改良することにより耐蝕性を確保しながら、低温チ
ッピング性を著しく改良したものであり、さらに、プレ
ス加工によりたとえ鋼板上のZn系合金めっき層が局部的
に剥離することがあっても、可撓性に優れた有機樹脂皮
膜層に覆われているので、Zn系合金めっき層単独の場合
に比較してプレス時の疵の原因となるパウダリング量を
低下できるのである。Therefore, in the rust preventive steel sheet for automobile outer surface excellent in low temperature chipping property according to the present invention, while ensuring corrosion resistance by improving the organic resin film layer, the low temperature chipping property is remarkably improved. In addition, even if the Zn-based alloy plating layer on the steel sheet may be locally peeled off by pressing, the Zn-based alloy plating layer is covered by the organic resin film layer with excellent flexibility. The amount of powdering that causes flaws at the time of pressing can be reduced as compared with the case of using alone.
なお、有機樹脂皮膜層にSiO2、各種防錆顔料また、その
他の添加剤を含有させて種々の性能を向上することも可
能である。It is also possible to improve the various performances by adding SiO 2 , various rust preventive pigments and other additives to the organic resin film layer.
また、鋼板上のZn系合金めっき層の上に設けるクロメー
ト処理皮膜層或いは燐酸塩処理皮膜層は、Zn系合金めっ
き層と有機樹脂皮膜層のバインダーとしての作用を行う
ものであれば、どのようなものでもその種類は問はな
い。What is the chromate treatment film layer or phosphate treatment film layer provided on the Zn-based alloy plating layer on the steel plate as long as it functions as a binder for the Zn-based alloy plating layer and the organic resin film layer? It doesn't matter what kind it is.
［実施例］ 本発明に係る低温チッピング性の優れた自動車外面用防
錆鋼板の実施例を説明する。[Example] An example of an anticorrosive steel sheet for automobile outer surfaces, which is excellent in low-temperature chipping property, according to the present invention will be described.
通常の硫酸亜鉛、硫酸ニッケルを主成分とするめっき液
中に、鋼板を陰極として電解を行い、20g/m2の付着量を
有するZn−Ni系合金めっき鋼板上にクロメート処理皮膜
層を設け、さらに、その上に、Tg点が100℃、60℃、55
℃、40℃、16℃である第一工業製薬製の水溶性自己乳化
型ウレタン樹脂（Ａ）のウレタン系水溶性有機樹脂皮膜
層を1.0μｍの厚さに設けた。Ordinary zinc sulfate, in a plating solution containing nickel sulfate as a main component, electrolysis is performed with the steel plate as a cathode, and a chromate treatment coating layer is provided on a Zn-Ni alloy plated steel plate having an adhesion amount of 20 g / m 2 . Furthermore, the Tg point is 100 ℃, 60 ℃, 55
A urethane water-soluble organic resin film layer of water-soluble self-emulsifying urethane resin (A) manufactured by Daiichi Kogyo Seiyaku Co., Ltd. having a temperature of 40 ° C., 16 ° C. was provided to a thickness of 1.0 μm.
この鋼板の上に自動車のに適用されている下塗り電着塗
装20μｍ、中塗り35μｍ、上塗り35μｍの厚さ（全体の
厚さは90μｍである。）に焼付け、試験片を−20℃に冷
却した状態において、7.9〜11.1mmの径を有する御影石1
00gをグラベロメーターにより空気圧4.0kg/cm2、距離30
0mmで打ち付け、Zn−Ni系合金めっき層と素地界面から
剥離した最大径を測定した。This steel plate was baked to a thickness of 20 μm for undercoat electrodeposition coating applied to automobiles, 35 μm for intermediate coating, and 35 μm for top coating (total thickness is 90 μm), and the test piece was cooled to −20 ° C. Granite 1 with a diameter of 7.9 to 11.1 mm in the state
Air pressure 4.0g / cm 2 , distance 30 with 00g
The maximum diameter peeled from the interface between the Zn-Ni alloy plating layer and the substrate was measured by hitting at 0 mm.
第１図にその結果を示す。The results are shown in FIG.
この第１図から、Tg点が55℃以下で最大めっき剥離径が
著しく小さくなり、有機樹脂皮膜層のないZn−Ni系合金
めっき鋼板のままの状態に比較して大きく改善されてい
ることがわかる。From FIG. 1, it can be seen that the maximum peeling diameter of the plating is remarkably reduced when the Tg point is 55 ° C. or lower, which is a great improvement compared to the state of the Zn-Ni alloy plated steel sheet without the organic resin coating layer. Recognize.
また、Tg点が60℃では低温チッピング性は改善されては
いるが充分ではなく、さらに、Tg点が100℃になるとZn
−Ni系合金めっき鋼板そのままのものに比して何等の改
善効果は認められない。Also, when the Tg point is 60 ° C, the low temperature chipping property is improved, but it is not sufficient.
-No improvement effect is recognized compared to the Ni-based alloy plated steel sheet as it is.
そして、この第１図から明らかであるが、Tg点が55℃を
境としてTg点の低下に伴って低温チッピング性は向上し
ていくが、Tg点があまりに低い値の有機樹脂皮膜層を採
用するとコスト高となる割には、それほどチッピング性
が改善されることにはならないことと、耐蝕性の劣化を
招くことからTg点は55℃以下〜18℃の範囲とするのがよ
い。As is clear from FIG. 1, the low temperature chipping property improves with the decrease of the Tg point at the Tg point of 55 ° C, but an organic resin film layer having a too low Tg point is adopted. Then, although the cost is high, the chipping property is not so improved and the corrosion resistance is deteriorated, so that the Tg point is preferably in the range of 55 ° C to 18 ° C.
次に、第２図に、Tg点50℃の第１図と同じウレタン系水
溶性樹脂の皮膜層（塗膜硬度は鉛筆硬度のHB）の膜厚を
変化させた場合の第１図と同様の低温チッピング試験を
行った結果を示す。Next, in FIG. 2, the same as in FIG. 1 when the film thickness of the urethane water-soluble resin coating layer (coating hardness is HB of pencil hardness) same as that in FIG. The results of the low temperature chipping test are shown.
この第２図から有機樹脂皮膜層の厚さが0.1μｍ以上でZ
n−Ni系合金めっき層の剥離径は極めて小さくなり、チ
ッピング性改善効果は充分である。It can be seen from Fig. 2 that the thickness of the organic resin film layer is 0.1 μm or more and Z
The peeling diameter of the n-Ni alloy plating layer becomes extremely small, and the effect of improving the chipping property is sufficient.
また、上記ウレタン系有機樹脂皮膜層以外に、エポキシ
系（旭電化製のビスフェノールＡ型汎用液状エポキシ趣
旨（Ｂ））、アクリル系（ヘキスト合成製水溶性アクリ
ル樹脂（Ｃ））の有機樹脂皮膜層について、Tg点を変化
させて低温チッピング性を調査したが、何れの場合にお
いてもTg点55℃以下、有機樹脂皮膜層の厚さ0.1μｍ以
上で優れた効果が認められた。In addition to the urethane-based organic resin film layer, an epoxy-based (bisphenol A-type general-purpose liquid epoxy purpose (B) epoxy resin manufactured by Asahi Denka), acrylic (water-soluble acrylic resin (C) manufactured by Hoechst Synthetic) organic resin film layer The low temperature chipping property was investigated by changing the Tg point, and in any case, an excellent effect was observed at a Tg point of 55 ° C. or less and an organic resin film layer thickness of 0.1 μm or more.
第１表に、上記の例および比較例としてZn−Niめっき鋼
板、Zn−Fe/Zn−Niめっき鋼板についてめっき剥離径に
ついて示してある。Table 1 shows the stripping diameter of the Zn-Ni plated steel sheet and the Zn-Fe / Zn-Ni plated steel sheet as the above examples and comparative examples.
この第１表から、本発明に係る低温チッピング性に優れ
た自動車外面用防錆鋼板は、塗膜硬度が鉛筆硬度のＨ〜
2Bにおいて低温ピッチング試験において著しく小さいめ
っき剥離径を示していることがわかる。From Table 1, it can be seen from the Table 1 that the anticorrosion steel sheet for automobile outer surface excellent in low temperature chipping property according to the present invention has a coating film hardness of H to pencil hardness.
It can be seen that 2B shows a remarkably small plating peeling diameter in the low temperature pitting test.
［発明の効果］ 以上説明したように、本発明に係る低温チッピング性に
優れた自動車外面用防錆鋼板は上記の構成であるから、
下地、中塗り、上塗り塗装後の収縮応力がZn系合金めっ
き層には及ばず、また、優れた低温チッピング性を有す
るという効果を有するものである。 [Advantages of the Invention] As described above, since the rustproof steel sheet for automobile outer surface excellent in low temperature chipping property according to the present invention has the above configuration,
The shrinkage stress after the undercoating, the intermediate coating, and the overcoating does not reach the Zn-based alloy plating layer, and has an effect of having excellent low temperature chipping property.
第１図は有機樹脂皮膜層のTg点および塗膜強度（鉛筆硬
度）と最大めっき剥離径との関係を示す図、第２図は有
機樹脂皮膜層の厚さと最大めっき剥離径との関係を示す
図、第３図は塗膜硬度（鉛筆硬度）とパウダー発生量と
の関係を示す図である。Fig. 1 shows the relationship between the Tg point and coating strength (pencil hardness) of the organic resin film layer and the maximum plating peel diameter, and Fig. 2 shows the relationship between the organic resin film layer thickness and the maximum plating peel diameter. FIG. 3 and FIG. 3 are views showing the relationship between coating film hardness (pencil hardness) and the amount of powder generated.
Claims (1)
設け、その上に、クロメート処理皮膜層或いは燐酸塩処
理皮膜層を設け、さらにその上に、Tg点55℃以下で、か
つ、焼付け後の常温における硬度が鉛筆硬度のＨ〜2Bで
ある有機樹脂皮膜層が0.1〜2.0μｍの厚さに設けられて
いることを特徴とする低温チッピング性に優れた自動車
外面用防錆鋼板。1. A Zn-based alloy plating layer of 10 g / m 2 or more is provided on a steel plate, a chromate treatment film layer or a phosphate treatment film layer is provided thereon, and a Tg point of 55 ° C. or less is further provided thereon. And an organic resin coating layer having a pencil hardness of H to 2B at room temperature after baking is provided in a thickness of 0.1 to 2.0 μm, which is excellent in low temperature chipping property and is used for automobile exterior surface protection. Rusted steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62236690A JPH0735105B2 (en) | 1987-09-21 | 1987-09-21 | Anticorrosion steel plate for automobile exterior with excellent low temperature chipping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62236690A JPH0735105B2 (en) | 1987-09-21 | 1987-09-21 | Anticorrosion steel plate for automobile exterior with excellent low temperature chipping |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6478832A JPS6478832A (en) | 1989-03-24 |
| JPH0735105B2 true JPH0735105B2 (en) | 1995-04-19 |
Family
ID=17004327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62236690A Expired - Fee Related JPH0735105B2 (en) | 1987-09-21 | 1987-09-21 | Anticorrosion steel plate for automobile exterior with excellent low temperature chipping |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0735105B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2952266B2 (en) * | 1990-01-30 | 1999-09-20 | 日新製鋼株式会社 | Roof and exterior materials |
| JP2726872B2 (en) * | 1990-12-25 | 1998-03-11 | 新日本製鐵株式会社 | Manufacturing method of galvanized steel sheet with excellent low temperature chipping resistance and perforated corrosion resistance |
| JPH11291395A (en) * | 1998-04-06 | 1999-10-26 | Nippon Steel Corp | Precoated steel sheet with excellent weather resistance and impact resistance and its use |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57185987A (en) * | 1981-05-06 | 1982-11-16 | Kawasaki Steel Corp | Surface treatment of zinc electroplated steel plate |
| JPS59193279A (en) * | 1983-04-15 | 1984-11-01 | Nisshin Steel Co Ltd | Steel sheet hot-dip coated with composite zinc-aluminum layer as undercoat for coating |
| JPS59193280A (en) * | 1983-04-18 | 1984-11-01 | Nisshin Steel Co Ltd | Steel sheet hot-dip coated with composite zinc-aluminum layer as undercoat for coating |
| JPS60171145A (en) * | 1984-02-15 | 1985-09-04 | 日新製鋼株式会社 | Coated steel plate having excellent heating peeling resistance |
-
1987
- 1987-09-21 JP JP62236690A patent/JPH0735105B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6478832A (en) | 1989-03-24 |
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