JPH0533151A - Surface treating agent for aluminum alloy - Google Patents
Surface treating agent for aluminum alloyInfo
- Publication number
- JPH0533151A JPH0533151A JP21442691A JP21442691A JPH0533151A JP H0533151 A JPH0533151 A JP H0533151A JP 21442691 A JP21442691 A JP 21442691A JP 21442691 A JP21442691 A JP 21442691A JP H0533151 A JPH0533151 A JP H0533151A
- Authority
- JP
- Japan
- Prior art keywords
- treatment
- plating
- zinc
- alloy
- treating agent
- 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.)
- Pending
Links
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 23
- 238000007747 plating Methods 0.000 claims abstract description 38
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 19
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 13
- 239000011701 zinc Substances 0.000 claims abstract description 13
- 229910001297 Zn alloy Inorganic materials 0.000 claims abstract description 9
- 150000001412 amines Chemical class 0.000 claims abstract description 5
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims abstract description 5
- 235000018553 tannin Nutrition 0.000 claims abstract description 5
- 229920001864 tannin Polymers 0.000 claims abstract description 5
- 239000001648 tannin Substances 0.000 claims abstract description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000654 additive Substances 0.000 claims description 7
- 230000000996 additive effect Effects 0.000 claims description 5
- 239000012756 surface treatment agent Substances 0.000 claims description 5
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 abstract description 21
- 229910000165 zinc phosphate Inorganic materials 0.000 abstract description 21
- 239000003795 chemical substances by application Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 10
- 238000004381 surface treatment Methods 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 3
- 239000012964 benzotriazole Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 8
- 239000002585 base Substances 0.000 description 7
- 238000005406 washing Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009713 electroplating Methods 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910018137 Al-Zn Inorganic materials 0.000 description 1
- 229910018182 Al—Cu Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- 229910018566 Al—Si—Mg Inorganic materials 0.000 description 1
- 229910018573 Al—Zn Inorganic materials 0.000 description 1
- 229920000298 Cellophane Polymers 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910019086 Mg-Cu Inorganic materials 0.000 description 1
- 229910007567 Zn-Ni Inorganic materials 0.000 description 1
- 229910007614 Zn—Ni Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- LJCNRYVRMXRIQR-OLXYHTOASA-L potassium sodium L-tartrate Chemical compound [Na+].[K+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O LJCNRYVRMXRIQR-OLXYHTOASA-L 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000011006 sodium potassium tartrate Nutrition 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Landscapes
- Chemically Coating (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、アルミニウム或いはア
ルミニウム合金(以下、総称して「アルミニウム合金」
と呼ぶ)の表面処理剤に関し、特に、塗装下地処理とし
てりん酸亜鉛処理が施される用途、例えば、自動車パネ
ル材の表面処理において、りん酸亜鉛処理性に優れる表
面を付与でき、塗膜密着性を著しく向上し得る表面処理
剤に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to aluminum or an aluminum alloy (hereinafter collectively referred to as "aluminum alloy").
In particular, in applications where zinc phosphate treatment is applied as a coating base treatment, for example, in the surface treatment of automobile panel materials, it is possible to impart a surface with excellent zinc phosphate treatment properties and to adhere coatings. The present invention relates to a surface treatment agent which can remarkably improve the properties.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】アルミ
ニウム合金は、軽量化を目的として自動車パネル材など
の自動車部材に採用されつつある。しかし、通常の自動
車塗装ラインの下地処理はりん酸亜鉛処理であって、鋼
材に対しては、塗料の密着性の確保及び耐食性の向上に
効果的であるが、アルミニウム合金に対しては充分な下
地処理とは言えないのが現状である。2. Description of the Related Art Aluminum alloys are being adopted for automobile members such as automobile panel materials for the purpose of weight reduction. However, the base treatment of a normal automobile coating line is zinc phosphate treatment, which is effective for securing the adhesiveness of the coating and improving the corrosion resistance for steel materials, but is sufficient for aluminum alloys. At present, it cannot be said that the surface treatment is performed.
【０００３】すなわち、通常の自動車塗装ラインにおい
て、塗装の下地処理としてりん酸亜鉛処理が採用されて
いるのは、専ら鋼材用の下地処理のためであるが、自動
車部材に鋼材と共にアルミニウム合金を適用する場合に
は、同じ下地処理によってアルミニウム合金も下地処理
するのが経済的である。しかるに、アルミニウム合金に
この下地処理(りん酸亜鉛処理)を行うと、りん酸亜鉛処
理性がよくなく、したがって、優れた塗膜密着性等が得
られないという問題があった。That is, in the ordinary automobile coating line, zinc phosphate treatment is adopted as the base treatment for coating only for the base treatment for steel materials, but aluminum alloy is applied to automobile members together with steel materials. In this case, it is economical to subject the aluminum alloy to the same base treatment. However, when the aluminum alloy is subjected to this undercoating treatment (zinc phosphate treatment), the zinc phosphate treatability is not good, so that there is a problem that excellent coating film adhesion and the like cannot be obtained.
【０００４】このため、従来より、アルミニウム合金の
りん酸亜鉛処理性を改善しようとする提案がなされてい
る。例えば、特開昭６１−１５７６９３号には、りん酸
亜鉛処理性を改善するためにアルミニウム合金に亜鉛め
っきを施すことが提案されている。具体的には、亜鉛め
っき層或いは亜鉛系合金めっき層を１g／m2以上の付着
量にて形成するというものである。For this reason, conventionally, proposals have been made to improve the zinc phosphate treatability of aluminum alloys. For example, JP-A-61-157693 proposes to galvanize an aluminum alloy in order to improve the zinc phosphate treatment property. Specifically, the zinc plating layer or the zinc-based alloy plating layer is formed with an adhesion amount of 1 g / m 2 or more.
【０００５】この提案では、亜鉛めっき法を公知の電気
めっき或いは浸漬めっき法により行うもので、通常のめ
っき条件、めっき浴組成でよいとされている。具体例と
しては電気めっき法が示されている。しかし、この電気
めっき法によってもめっき皮膜の密着性が必ずしも充分
とは云えない。According to this proposal, the galvanizing method is carried out by a known electroplating method or an immersion plating method, and it is said that ordinary plating conditions and plating bath compositions are sufficient. An electroplating method is shown as a specific example. However, even with this electroplating method, the adhesion of the plating film is not always sufficient.
【０００６】また、亜鉛めっきの別の方法としては、い
わゆるジンケート処理があるが、以下に示すとおり、２
段のジンケート処理を実施しなければ、めっき皮膜の密
着性が改善されないといわれるものであり、煩雑な工程
を必要とするので、工業的方法としては難点があった。Another method of galvanizing is so-called zincate treatment.
It is said that the adhesion of the plating film is not improved unless the stepped zincate treatment is performed, and a complicated process is required, which is a problem as an industrial method.
【０００７】（従来のジンケート処理工程）アルカリエ
ッチング→水洗→硝酸洗浄→１段目ジンケート処理→水
洗→硝酸剥離→水洗→２段目ジンケート処理→水洗。な
お、ジンケート処理浴は、通常、ＮaＯＨ、ＺnＯにロッ
セル塩等を添加した組成のもので、２０〜２４℃で、３
０秒浸漬の条件が代表的である。(Conventional zincate treatment step) Alkaline etching → washing → nitric acid washing → first stage zincate treatment → water washing → nitric acid peeling → water washing → second stage zincate treatment → water washing. The zincate treatment bath is usually a composition of NaOH, ZnO added with Rochelle salt, etc.
The condition of 0 second immersion is typical.
【０００８】本発明は、上記従来技術の問題点を解決
し、りん酸亜鉛処理性に優れる亜鉛或いは亜鉛合金めっ
き処理を行うに際し、煩雑な工程に頼ることなく、１段
の化学処理でも、アルミニウム合金表面に密着性の優れ
ためっき皮膜を形成し得る処理技術を提供することを目
的とするものである。The present invention solves the above-mentioned problems of the prior art, and when performing a zinc or zinc alloy plating treatment which is excellent in zinc phosphate treatment, it does not rely on complicated steps, and even if it is a single-step chemical treatment, aluminum is used. It is an object of the present invention to provide a treatment technique capable of forming a plating film having excellent adhesion on the surface of an alloy.
【０００９】[0009]
【課題を解決するための手段】前記課題を解決するた
め、本発明者は、アルミニウム合金の亜鉛或いは亜鉛合
金めっき処理法の条件、特に処理剤について鋭意研究を
重ねた結果、ここに本発明を完成したものである。In order to solve the above-mentioned problems, the present inventor has conducted earnest research on conditions of a zinc or zinc alloy plating method for aluminum alloys, in particular, a treating agent, and as a result, It has been completed.
【００１０】すなわち、本発明は、ＺnＯとＮaＯＨを主
添加成分とする亜鉛及び亜鉛合金めっき用アルミニウム
合金表面処理剤において、ベンズトリアゾール、アミン
及びタンニンのうちの１種以上を含み、その添加量の合
計が０.１〜２g／lであることを特徴とするめっき皮膜
の密着性に優れるアルミニウム合金表面処理剤を要旨と
するものである。That is, the present invention relates to an aluminum alloy surface treatment agent for zinc and zinc alloy plating, which contains ZnO and NaOH as main addition components, and contains at least one of benztriazole, amine and tannin, and its addition amount The gist is an aluminum alloy surface treatment agent having excellent adhesion of a plating film, which is characterized in that the total amount is 0.1 to 2 g / l.
【００１１】以下に本発明を更に詳述する。The present invention will be described in more detail below.
【００１２】[0012]
【００１３】前述のように、本発明の処理剤は、ＺnＯ
とＮaＯＨを主添加成分とするが、これに更に、ベンズ
トリアゾール、アミン及びタンニンのうちの１種以上を
０.１〜２g／l添加しためっき浴である。このめっき浴
を用いて亜鉛めっきを行うことにより、アルミニウム合
金表面に密着性に優れためっき皮膜を形成できる。As described above, the treating agent of the present invention is ZnO.
And NaOH as main addition components, and 0.1 to 2 g / l of benztriazole, amine and tannin are further added to the plating bath. By performing zinc plating using this plating bath, a plating film having excellent adhesion can be formed on the surface of the aluminum alloy.
【００１４】この処理剤の成分限定理由は以下のとおり
である。The reasons for limiting the components of this treating agent are as follows.
【００１５】ＺnＯは、アルミニウム合金表面に析出す
る亜鉛の供給源として必須であり、また、ＮaＯＨはア
ルミニウム合金を溶解し亜鉛の析出を可能とするための
成分である。これらの主添加成分の添加量は特に制限さ
れるものではないが、それぞれＺnＯは５〜２０g／l、
ＮaＯＨは５０〜２５０g／lが好ましい。ZnO is indispensable as a supply source of zinc deposited on the surface of the aluminum alloy, and NaOH is a component for dissolving the aluminum alloy and enabling the deposition of zinc. The addition amount of these main addition components is not particularly limited, but ZnO is 5 to 20 g / l,
NaOH is preferably 50 to 250 g / l.
【００１６】ベンズトリアゾール、アミン及びタンニン
は、それぞれ、めっき皮膜の密着性を向上するために効
果的な成分である。これらの１種以上を主添加成分に添
加した処理剤により、１段処理が可能となる。Benztriazole, amine and tannin are effective components for improving the adhesion of the plating film. The treatment agent containing one or more of these added to the main additive component enables one-step treatment.
【００１７】これらの添加剤の総添加量が０.１g／l未
満では、めっき皮膜の均一な析出ができず、密着性は向
上しない。また２g／lを超えると密着性の向上効果が飽
和すると共にめっき皮膜の析出速度が低下し、りん酸亜
鉛処理皮膜量が少なくなり、りん酸亜鉛処理性が劣化す
るので好ましくない。よって、添加剤の総添加量は０.
１〜２g／lの範囲とする。If the total amount of these additives added is less than 0.1 g / l, the plating film cannot be uniformly deposited and the adhesion cannot be improved. Further, if it exceeds 2 g / l, the effect of improving the adhesion is saturated, the deposition rate of the plating film decreases, the amount of the zinc phosphate-treated film decreases, and the zinc phosphate treatment property deteriorates, which is not preferable. Therefore, the total amount of additives added is 0.
The range is 1 to 2 g / l.
【００１８】勿論、亜鉛合金めっきの場合には、適当な
合金元素を添加することができる。Of course, in the case of zinc alloy plating, a suitable alloying element can be added.
【００１９】このような処理剤を用いて亜鉛及び亜鉛合
金めっきを行うことにより、アルミニウム合金表面に、
例えばＺn−Ｆe、Ｚn−Ｎi或いはＺn−Ｆe−Ｎi皮膜が
得られる。By plating zinc and a zinc alloy with such a treating agent, the aluminum alloy surface is
For example, a Zn-Fe, Zn-Ni or Zn-Fe-Ni coating is obtained.
【００２０】なお、この処理剤を用いて行う亜鉛めっき
及び亜鉛合金めっきの他の化学めっき条件は、適宜決め
られるもので、特に制限されない。また、アルミニウム
合金の成分系も制限されず、Ａl−Ｍg系、Ａl−Ｃu系、
Ａl−Ｚn系、Ａl−Ｓi−Ｍg系、Ａl−Ｍg−Ｃu系等々、
種々の成分系及び組成のものが可能である。勿論、この
処理剤を用いためっき後に下地処理として適用するりん
酸亜鉛処理を通常の条件で実施しても、本発明の優れた
効果が発揮できる。The other chemical plating conditions for zinc plating and zinc alloy plating using this treatment agent are appropriately determined and are not particularly limited. Also, the component system of the aluminum alloy is not limited, and Al-Mg system, Al-Cu system,
Al-Zn system, Al-Si-Mg system, Al-Mg-Cu system, etc.
Various component systems and compositions are possible. Of course, the excellent effect of the present invention can be exhibited even if the zinc phosphate treatment applied as the base treatment after plating using this treatment agent is carried out under normal conditions.
【００２１】次に本発明の実施例を示す。Next, examples of the present invention will be described.
【００２２】[0022]
【実施例】ＪＩＳ６０６１合金、５１８２合金の供試材
について、常法により脱脂→アルカリエッチング→水洗
→硝酸洗浄の後、[Example] Regarding the test materials of JIS6061 alloy and 5182 alloy, after degreasing → alkali etching → washing with water → washing with nitric acid by a conventional method,
【表１】 に示す組成の処理浴を用いて亜鉛めっき処理した。処理
浴温度は３５℃、処理時間は５０秒である。[Table 1] Galvanization was performed using a treatment bath having the composition shown in. The treatment bath temperature is 35 ° C. and the treatment time is 50 seconds.
【００２３】めっき皮膜の密着性及びりん酸亜鉛処理性
を調査した結果を表１に併記する。なお、めっき皮膜の
密着性はセロテープ剥離試験により評価し、りん酸亜鉛
処理性は市販のりん酸亜鉛処理浴で処理し皮膜量を測定
して評価した。Table 1 also shows the results of the investigation of the adhesion and zinc phosphate treatment of the plating film. The adhesion of the plating film was evaluated by a cellophane tape peeling test, and the zinc phosphate treatment property was evaluated by treating with a commercially available zinc phosphate treatment bath and measuring the coating amount.
【００２４】表１より明らかなように、本発明例はいず
れも、めっき皮膜の密着性に優れ、りん酸亜鉛処理性が
優れている。As is clear from Table 1, all of the examples of the present invention are excellent in the adhesion of the plating film and in the zinc phosphate treatment property.
【００２５】これに対し、添加剤なしの場合(Ｎo.８)は
めっき皮膜の密着性に劣り、添加剤が少ない場合(Ｎo.
９、Ｎo.１０)もめっき皮膜の密着性の改善効果がな
い。一方、添加剤が多すぎると(Ｎo.１１)、めっき皮膜
の密着性は良好であるものの、りん酸亜鉛皮膜量が少な
く、りん酸亜鉛処理性が劣っている。On the other hand, when the additive is not added (No. 8), the adhesion of the plating film is poor, and when the additive is small (No. 8).
9, No. 10) also has no effect of improving the adhesion of the plating film. On the other hand, when the amount of the additive is too large (No. 11), the adhesion of the plating film is good, but the zinc phosphate film amount is small and the zinc phosphate treatment property is poor.
【００２６】[0026]
【発明の効果】以上詳述したように、本発明によれば、
亜鉛及び亜鉛合金めっき処理の１段処理においても、優
れためっき皮膜密着性が得られるので、りん酸亜鉛処理
を下地処理として施す自動車部材用アルミニウム合金の
表面処理用として有効である。As described in detail above, according to the present invention,
Even in the one-step treatment of zinc and zinc alloy plating treatment, excellent plating film adhesion can be obtained, and therefore it is effective for surface treatment of aluminum alloys for automobiles, which is subjected to zinc phosphate treatment as a base treatment.
Claims (1)
及び亜鉛合金めっき用アルミニウム合金表面処理剤にお
いて、ベンズトリアゾール、アミン及びタンニンのうち
の１種以上を含み、その添加量の合計が０.１〜２g／l
であることを特徴とするめっき皮膜の密着性に優れるア
ルミニウム合金表面処理剤。Claim: What is claimed is: 1. An aluminum alloy surface treatment agent for zinc and zinc alloy plating, which comprises ZnO and NaOH as main additive components, and contains at least one of benztriazole, amine and tannin, and the addition thereof. The total amount is 0.1-2g / l
The aluminum alloy surface treatment agent having excellent adhesion to the plating film, which is characterized by
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21442691A JPH0533151A (en) | 1991-07-31 | 1991-07-31 | Surface treating agent for aluminum alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21442691A JPH0533151A (en) | 1991-07-31 | 1991-07-31 | Surface treating agent for aluminum alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0533151A true JPH0533151A (en) | 1993-02-09 |
Family
ID=16655596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21442691A Pending JPH0533151A (en) | 1991-07-31 | 1991-07-31 | Surface treating agent for aluminum alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0533151A (en) |
-
1991
- 1991-07-31 JP JP21442691A patent/JPH0533151A/en active Pending
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