JP4131345B2 - Method for producing aluminum or aluminum alloy material plated with iron or iron-based alloy - Google Patents
Method for producing aluminum or aluminum alloy material plated with iron or iron-based alloy Download PDFInfo
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- JP4131345B2 JP4131345B2 JP10167798A JP10167798A JP4131345B2 JP 4131345 B2 JP4131345 B2 JP 4131345B2 JP 10167798 A JP10167798 A JP 10167798A JP 10167798 A JP10167798 A JP 10167798A JP 4131345 B2 JP4131345 B2 JP 4131345B2
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- Prior art keywords
- iron
- aluminum
- alloy
- aluminum alloy
- based alloy
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Description
【０００１】
【産業上の利用分野】
本発明は、例えば薄板状のアルミニウムまたはアルミニウム合金の表面もしくは一部に鉄または鉄合金をメッキしたアルミニウムまたはアルミニウム合金材料の新規な製造方法に関するもので、得られる材料は例えば自動車産業等に広く用い得る工業用材料である。
【０００２】
【従来の技術】
特に自動車産業では、自動車の軽量化のためにアルミニウムまたはアルミニウム合金が使用される傾向が見られる。しかし、アルミニウムまたはアルミニウム合金は、そのままでは自動車用の構造あるいは機能材料としては適さない。このため、アルミニウムまたはアルミニウム合金の表面に鉄または鉄合金メッキを施したものが注目されている。
【０００３】
本発明者は、平成９年７月４日に出願した特願平９−２１５３９６号で、アルミニウムまたはアルミニウム合金の表面に鉄または鉄系合金をメッキした新たな材料を提案した。この材料は、アルミニウムまたはアルミニウム合金と鉄または鉄系合金のメッキ面との境界域にそれらの相互拡散層を有するので、メッキ面がアルミニウム素地から剥離するおそれがなく、かつまたメッキ面は亀裂を有するので、塗料の付着性に優れた構造材料として適し、更にまた亀裂が油溜まりとなって油膜の保護に適するので耐摩耗性に優れた機械部品ともなり得る。
【０００４】
【発明が解決しようとする課題】
本発明者が先に提案した上述のアルミニウムまたはアルミニウム合金材料は、このように優れた構造または機能材料であるが、本発明は更にこれを改良するものである。
【０００５】
即ち、そのメッキ面の亀裂の開口幅が広め及び／または開口の凸部を平滑にして、その機能性を高めようとすることが、本発明の課題である。
【０００６】
【課題を解決するための手段】
そこで、本発明では、亀裂を有する鉄または鉄系合金がメッキされたアルミニウムまたはアルミニウム合金を電解処理して、亀裂の開口を広げ及び／または開口の微視的な凸部を平滑にするものである。以下に、本発明を更に実施例で説明する。
【０００７】
【発明の実施の形態】
実施例１
厚さ１ｍｍのアルミニウム合金（ＪＩＳ ５０５２）の圧延板を前処理（脱脂、酸活性、アルカリエッチング、酸活性、亜鉛置換、硫酸置換：ただし前処理の工程中で必要な水洗は記載を省略した。）した後、その外表面に厚さ２０ミクロンの鉄メッキを下記の条件で６０分で施した。
【０００８】
【０００９】
このようにして得られた鉄メッキしたアルミニウム合金板を水洗・乾燥した後に、不活性雰囲気中（圧力２ｂａｒのＮ２ガス中）で５７０℃で５時間加熱し、続いて同様な雰囲気中で冷却速度６０℃／分で急冷した。その結果、メッキ面には全面にわたってほぼ均一に発生した亀甲状の開口の幅が約３ミクロンの亀裂が走査型電子顕微鏡の観察で認められた。
【００１０】
このアルミニウム合金板を電解処理した。電解条件は、上記したところと同一の液組成を用い、電流密度を３Ａ／ｄｍ２、液温４０〜４５℃，電解時間を３０秒とした。その結果、亀甲の開口幅は約９ミクロンに拡大し、開口付近の微視的な凹凸が研磨されていることが認められた。
【００１１】
また、このアルミニウム合金板の断面組織をＥＰＭＡで検討したしたところ、アルミニウム素地と鉄メッキの境界域にＡｌとＦｅの相互拡散層の生成が認められ、両者が密着していることが観察された。また、９０゜曲げ試験でも両者は全く剥離しなかった。
【００１２】
このアルミニウム合金板を回転試験片とし、Ｓ４５Ｃ、ＨＱＴ，Ｓｏｒ−ｂｉｔｅを固定試験片として、下記の条件で摩耗試験を行なった。
１）摩擦面に試験開始の直前に７．５Ｗ３０ＳＥモーター油を塗布した。
２）接触圧力：２Ｋｇｆ／ｃｍ２（０．１９６ＭＰａ）
３）摩擦係数：０．０３〜０．０５
【００１３】
その結果、比摩耗量（０〜５００００ｍ）では、５．７０×１０−１０ｍｍ３／Ｋｇｆ・ｍｍであり、同（３００００〜５００００ｍ）では、５．８８×１０−１１ｍｍ３／Ｋｇｆ／ｍｍであって、誠に優れた耐摩耗性が示された。
【００１４】
実施例２
厚さ１ｍｍのアルミニウム合金（ＪＩＳ ５０５２）の圧延板を実施例１と同様に前処理し、その外表面に厚さ約２０ミクロンのクロムを７重量％含む鉄系合金のメッキを下記の条件で３５分で施した。
【００１５】
液組成：トライクロムプラス（アトテックジャパン社製）をベースとし、これに硫酸第一鉄４０ｇ／ｌを添加した。
このトライクロムプラスは
塩基性硫酸クロム（皮なめし剤）１２０ｇ／ｌ
蟻酸アンモニウム ５５ｇ／ｌ
臭酸アンモニウム １０ｇ／ｌ
塩化カリウム ５４ｇ／ｌ
塩化アンモニウム ５４ｇ／ｌ
ホウ酸 ４０ｇ／ｌ
からなり、３価のクロムメッキの組成に相当する。
液 温：４０〜４５℃
陰 極：不溶性のカーボンを使用
電流密度：５Ａ／ｄｍ２
【００１６】
鉄・クロム合金メッキ皮膜（蛍光Ｘ線分析によれば、Ｆｅ：９３．０３．％、Ｃｒ：６．５５％）の硬さは約７５７ＨＶであり、走査型電子顕微鏡で観察したところ、メッキ皮膜の全面にわたって亀甲状に成長した開口が約３ミクロンの亀裂が認められた。この実施例では、クロムを７重量％含む鉄系合金を用いたが、クロム１〜３０重量％を含む鉄合金でも同様な亀裂が生じることが実験の結果で分った。
【００１７】
このようにして得られた鉄・クロム合金でメッキされたアルミニウム合金板を水洗いして乾燥した後、不活性雰囲気中（圧力２ｂａｒのＮ２ガス中）で５７０℃で５時間加熱し、続いて同様な雰囲気中で冷却速度６０℃／分で急冷した。次にこのアルミニウム合金板を電解処理（電解液は前記した液組成と同じで、電流密度５Ａ／ｄｍ２，液温４０〜４５℃，電解時間３０秒）した。その結果、亀裂の開口幅は約１０ミクロンに広がり、開口付近の微視的な凸部は平滑に電解研磨された。
【００１８】
このアルミニウム合金材料の断面組織をＥＰＭＡで検討したところ、アルミニウム素地とメッキ面の境界域にそれらの金属の相互拡散層の生成が認められ、両者が密着していることが認めらた。また、９０゜曲げ試験でも両者の剥離は全くなかった。更に、塗料の付着性がよいことも確かめられた。
【００１９】
このアルミニウム合金材料を回転試験片として、前記実施例１と同様な摩耗試験を行ったところ、同様な結果が得られ、この材料の優れた耐摩耗性が確認された。
【００２０】
なお、加熱、冷却処理後にアルミニウム合金板を電解処理する代わりに、加熱、冷却前に合金板を電解処理したところ、その結果は上記したところと同様に良好であった。
【００２１】
また、上述した実施例１と２において、電解条件を変えることによって、亀裂の開口幅を約２０ミクロンにまで広げることが可能であり、また開口を大幅に広げることなしに、開口付近の凸部のみを平滑にすることもできることが分かった。
【００２２】
【発明の効果】
上述したところから明かな通り、本発明によれば表面に亀裂があるように鉄または鉄系合金がメッキされたアルミニウムまたはアルミニウム合金材料の物理的特性、例えば耐摩耗性、塗料の付着性等が更に改善される効果がある。[0001]
[Industrial application fields]
The present invention relates to a novel method for producing aluminum or an aluminum alloy material in which iron or an iron alloy is plated on the surface or part of a thin plate-like aluminum or aluminum alloy, for example, and the obtained material is widely used in, for example, the automobile industry. It is an industrial material to obtain.
[0002]
[Prior art]
In the automobile industry in particular, there is a tendency to use aluminum or aluminum alloys for reducing the weight of automobiles. However, aluminum or an aluminum alloy is not suitable as a structural or functional material for automobiles as it is. For this reason, the surface of iron or an iron alloy plated with iron or an iron alloy is attracting attention.
[0003]
The present inventor proposed a new material in which the surface of aluminum or an aluminum alloy is plated with iron or an iron-based alloy in Japanese Patent Application No. 9-215396 filed on July 4, 1997. This material has a mutual diffusion layer in the boundary area between the aluminum or aluminum alloy and the iron or iron-based alloy plating surface, so that the plating surface does not peel off from the aluminum substrate, and the plating surface does not crack. Therefore, it can be used as a structural material having excellent paint adhesion, and can be a mechanical part having excellent wear resistance since cracks form an oil reservoir suitable for protecting an oil film.
[0004]
[Problems to be solved by the invention]
The above-mentioned aluminum or aluminum alloy material previously proposed by the present inventor is such an excellent structural or functional material, but the present invention further improves this.
[0005]
That is, it is an object of the present invention to increase the functionality by increasing the opening width of the crack on the plated surface and / or smoothing the convex portion of the opening.
[0006]
[Means for Solving the Problems]
Therefore, in the present invention, the aluminum or aluminum alloy plated with cracked iron or iron-based alloy is subjected to electrolytic treatment to widen the opening of the crack and / or smooth the microscopic convex portion of the opening. is there. Hereinafter, the present invention will be further described with reference to examples.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Example 1
Pre-treatment (degreasing, acid activity, alkali etching, acid activity, zinc substitution, sulfuric acid substitution: 1 mm thick rolled sheet of aluminum alloy (JIS 5052): However, the description of water washing required in the pretreatment step is omitted. Then, iron plating with a thickness of 20 microns was applied to the outer surface in 60 minutes under the following conditions.
[0008]
[0009]
The iron-plated aluminum alloy plate thus obtained was washed with water and dried, then heated in an inert atmosphere (in N 2 gas at a pressure of 2 bar) at 570 ° C. for 5 hours, and then cooled in the same atmosphere. Quenched at a rate of 60 ° C./min. As a result, a crack having a turtle shell-like opening width of about 3 microns, which was generated almost uniformly on the entire plated surface, was observed with a scanning electron microscope.
[0010]
This aluminum alloy plate was subjected to electrolytic treatment. As the electrolysis conditions, the same liquid composition as described above was used, the current density was 3 A / dm 2 , the liquid temperature was 40 to 45 ° C., and the electrolysis time was 30 seconds. As a result, the opening width of the tortoise shell was expanded to about 9 microns, and it was confirmed that microscopic irregularities near the opening were polished.
[0011]
Further, when the cross-sectional structure of the aluminum alloy plate was examined by EPMA, it was observed that an interdiffusion layer of Al and Fe was formed in the boundary region between the aluminum base and the iron plating, and the two were in close contact with each other. . Moreover, neither peeled at all in the 90 ° bending test.
[0012]
Using this aluminum alloy plate as a rotating test piece and S45C, HQT, Sor-bite as a fixed test piece, a wear test was performed under the following conditions.
1) 7.5W30SE motor oil was applied to the friction surface immediately before the start of the test.
2) Contact pressure: 2 kgf / cm 2 (0.196 MPa)
3) Friction coefficient: 0.03-0.05
[0013]
As a result, the specific wear amount (0 to 50000 m) is 5.70 × 10 −10 mm 3 / Kgf · mm, and the same (30000 to 50000 m) is 5.88 × 10 −11 mm 3 / Kgf / mm. However, excellent wear resistance was shown.
[0014]
Example 2
A 1 mm-thick aluminum alloy (JIS 5052) rolled plate was pretreated in the same manner as in Example 1 and the outer surface thereof was plated with an iron-based alloy containing 7% by weight of chromium having a thickness of about 20 microns under the following conditions. Applied in 35 minutes.
[0015]
Liquid composition: Trichrome plus (manufactured by Atotech Japan) was used as a base, and ferrous sulfate 40 g / l was added thereto.
This trichrome plus is basic chromium sulfate (tanning agent) 120g / l
Ammonium formate 55g / l
Ammonium bromate 10g / l
Potassium chloride 54g / l
Ammonium chloride 54g / l
Boric acid 40g / l
It corresponds to the composition of trivalent chromium plating.
Liquid temperature: 40-45 degreeC
Negative electrode: Insoluble carbon used Current density: 5 A / dm 2
[0016]
The hardness of the iron / chrome alloy plating film (according to X-ray fluorescence analysis: Fe: 93.03%, Cr: 6.55%) is about 757 HV. A crack having an opening of about 3 microns was observed over the entire surface. In this example, an iron-based alloy containing 7% by weight of chromium was used. However, it has been experimentally found that similar cracks occur even in an iron alloy containing 1-30% by weight of chromium.
[0017]
The aluminum alloy plate plated with the iron-chromium alloy thus obtained was washed with water and dried, and then heated at 570 ° C. for 5 hours in an inert atmosphere (N 2 gas at a pressure of 2 bar). Rapid cooling was performed at a cooling rate of 60 ° C./min in the same atmosphere. Next, this aluminum alloy plate was subjected to electrolytic treatment (the electrolytic solution was the same as the above-described liquid composition, the current density was 5 A / dm 2 , the liquid temperature was 40 to 45 ° C., and the electrolysis time was 30 seconds). As a result, the opening width of the crack spread to about 10 microns, and the microscopic convex portion near the opening was smoothly electropolished.
[0018]
When the cross-sectional structure of the aluminum alloy material was examined by EPMA, the formation of an interdiffusion layer of these metals was recognized in the boundary region between the aluminum base and the plating surface, and it was confirmed that the two were in close contact with each other. Also, there was no separation between the two in the 90 ° bending test. Furthermore, it was confirmed that the adhesion of the paint was good.
[0019]
When this aluminum alloy material was used as a rotating test piece, the same wear test as in Example 1 was performed. The same result was obtained, and the excellent wear resistance of this material was confirmed.
[0020]
In addition, when the aluminum alloy plate was subjected to an electrolytic treatment before the heating and cooling instead of the electrolytic treatment of the aluminum alloy plate after the heating and cooling treatment, the result was good as described above.
[0021]
Further, in Examples 1 and 2 described above, by changing the electrolysis conditions, it is possible to widen the opening width of the crack to about 20 microns, and without increasing the opening significantly, the convex portion in the vicinity of the opening. It was found that only smoothing could be achieved.
[0022]
【The invention's effect】
As is apparent from the above, according to the present invention, the physical properties of aluminum or aluminum alloy material plated with iron or an iron-based alloy so that there is a crack on the surface, such as wear resistance, paint adhesion, etc. The effect is further improved.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10167798A JP4131345B2 (en) | 1998-03-10 | 1998-03-10 | Method for producing aluminum or aluminum alloy material plated with iron or iron-based alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10167798A JP4131345B2 (en) | 1998-03-10 | 1998-03-10 | Method for producing aluminum or aluminum alloy material plated with iron or iron-based alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11256399A JPH11256399A (en) | 1999-09-21 |
| JP4131345B2 true JP4131345B2 (en) | 2008-08-13 |
Family
ID=14306992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10167798A Expired - Fee Related JP4131345B2 (en) | 1998-03-10 | 1998-03-10 | Method for producing aluminum or aluminum alloy material plated with iron or iron-based alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4131345B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4674746B2 (en) * | 2004-08-05 | 2011-04-20 | 国立大学法人室蘭工業大学 | Hydrogen gas generation method using activated aluminum fine particles |
| JP4878438B2 (en) * | 2005-03-08 | 2012-02-15 | 東京特殊電線株式会社 | Probe needle and manufacturing method thereof |
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1998
- 1998-03-10 JP JP10167798A patent/JP4131345B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11256399A (en) | 1999-09-21 |
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