JP3673886B2 - Wear-resistant iron and chrome-plated aluminum material - Google Patents
Wear-resistant iron and chrome-plated aluminum material Download PDFInfo
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- JP3673886B2 JP3673886B2 JP21888997A JP21888997A JP3673886B2 JP 3673886 B2 JP3673886 B2 JP 3673886B2 JP 21888997 A JP21888997 A JP 21888997A JP 21888997 A JP21888997 A JP 21888997A JP 3673886 B2 JP3673886 B2 JP 3673886B2
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- Prior art keywords
- wear
- iron
- aluminum
- coating layer
- aluminum material
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Description
【０００１】
【産業上の利用分野】
本発明は、アルミニウムまたはアルミニウム合金を素地とし、この表面に鉄・クロム合金メッキを施したアルミニウム材料に関するものでる。このようなアルミニウム材料は、自動車工業等の諸産業分野で今後更に広く使われるようになるものと思われる。
【０００２】
【従来の技術】
アルミニウム素地に鉄メッキを施したアルミニウム材料は今までにも知られている。しかし、鉄メッキは硬度が低いので、クロムを含む鉄でメッキをすることが試みられてきた。クロムを２〜２０％重量含む鋼は、その硬度が８００〜１２００ＨＶに達することが知られている。しかし、クロムを含む鉄をアルミニウム素地上にメッキすると、メッキ面に亀裂が生じてしまう。
【０００３】
【発明が解決しようとする課題】
そこで、本発明は、鉄・クロム合金メッキしたアルミニウム材料のメッキ面を活用した耐摩耗性のアルミニウム材料を提供するものである。
【０００４】
【課題を解決するための手段】
本発明では、亀裂の生じた鉄・クロム合金メッキ面にＰＴＦＥ、ナイロン等の熱可塑性樹脂の皮膜を施した。
【０００５】
かかる皮膜を形成するのには種々の方法があるが、溶融させた熱可塑性樹脂の皮膜の一部が亀裂内に侵入し、常温で固化し、これが皮膜の根となって皮膜のメッキ面への接着強さが高められることが肝要である。
【０００６】
このような熱可塑性樹脂の皮膜は、摩擦の過程で生ずる摩擦熱によって稼働中は液化して、潤滑剤としての役割を果たし、摩擦係数の低下ならびに摩耗量を軽減する。また、停止した状態では皮膜は固化しているため、塵埃などが付着する虞れがなく、摩耗特性を改善する。
【０００７】
また、本発明では、亀裂の生じた鉄・クロム合金メッキ面に、有機溶剤で溶かした熱硬化性樹脂に亀裂の幅またはそれよりも微細な固体潤滑剤をよく撹拌混合したものを塗布して皮膜を作り、次いでこれを加熱して溶剤を揮発させると共に、熱硬化性樹脂を固化させる。固体潤滑剤は固化した樹脂を介してメッキ面上と亀裂中に固着する。特に、亀裂中に侵入して固着した樹脂と潤滑剤はそれらの皮膜の根となって、皮膜がメッキ面から剥離するのを防ぐ。摩擦、摩耗の過程で、摩擦面間に介在する固体潤滑剤が摩擦係数の低下と摩耗量の軽減のために働くことになる。
【０００８】
【発明の実施の形態】
実施例１
厚さ２ｍｍのアルミニウム合金（ＪＩＳ ５０５２）片を通常のメッキ前処理（脱脂、酸活性、アルカリエッチング、酸活性、亜鉛置換、硫酸浸漬、亜鉛置換等）した後に、これに約２０ミクロンの厚さのクロムを約１５重量％含む鉄・クロム合金メッキを、下記の条件で施した。
【０００９】
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／１を添加した。
トライクロムプラスは、
塩基性流クロム（皮なめし剤）１２０ｇ／１
蟻酸アンモニウム ５５ｇ／１
臭酸アンモニウム １０ｇ／１
塩化カリウム ５４ｇ／１
塩化アンモニウム ５４ｇ／１
ホウ酸 ４０ｇ／１
からなり、３価のクロムメッキの組成に相当する。
液 温：３０℃
陰 極：不溶性のカーボンを使用
電流密度：１５Ａ／ｄｍ２で２分後、１０Ａ／ｄｍ２で１８分間処理
【００１０】
鉄・クロム合金メッキ被覆層の硬さは約８００ＨＶであり、その面を走査型電子顕微鏡で観察したところ、メッキ被覆層の面に全面にわたって微細な凸凹があり、そしてこの凸凹に関係なく亀裂が亀甲状に生じていることが認められた。
【００１１】
このアルミニウム合金材料片の表面の亀裂に圧力含浸法をもってＮｙｌｏｎ １１を含浸させると共に、その摩擦面に該熱可塑性樹脂の薄膜を形成した。
【００１２】
これを固定試験片とし、ソルバイト組織（ＨＱＴ）としたＳ４５Ｃを回転試験片として組合せ、ＰＩＮ−ＲＩＮＧ型摩耗試験機を使い、接触圧力を０．４９ＭＰａ．として滑り摩耗試験を行った。その結果は、図１中で本発明材料として示すカーブの通りであった。
【００１３】
なお、対比のために、上記したアルミニウム合金片を同様に鉄メッキし、ガス浸硫窒化処理し、対比固定試験片を作った。この対比試験片はガス浸硫窒化処理後の冷却を、冷却速度５℃／分で徐冷したので、その鉄メッキ被覆層には亀裂を見なかった。従って、その鉄メッキ被覆層にはＮｙｌｏｎ １１の薄膜は施さなかった。これを、前記したところと同様に滑り摩耗試験をした。その結果図１中で対比材料として示すカーブの通りである。
【００１４】
実施例２
熱硬化性樹脂であるエポキシ樹脂を有機溶剤で溶かし、この中に亀裂の幅もしくはそれ以下の粒径をもつ微細な固体潤滑剤であるＭｏＳ２を加え、充分に撹拌した後に、これを上述した実施例１のアルミニウム合金片の亀裂が生成したメッキ面に塗布した。続いて、これを約１５０℃に加熱し、溶剤を揮発させると共に、エポキシ樹脂を固化させた。
【００１５】
その結果、亀裂の内部に固体潤滑剤を含む樹脂が侵入して固化したために、これが塗布された皮膜の根となって、皮膜が鉄・クロム合金メッキ面から剥離することがなかった。
【００１６】
この実施例による本発明材料は、滑り摩耗試験で上記した実施例１の本発明材料と同様に摩擦係数の低下、摩耗量の軽減を示した。
【００１７】
【発明の効果】
本発明になるアルミニウムまたはアルミニウム合金の外表面に亀裂のある鉄・クロム合金メッキ被覆層を有し、この鉄・クロム合金メッキ被覆層に熱可塑性樹脂を含浸させたアルミニウム材料は、図１に示す滑り摩耗試験の結果の通り、優れた摩耗特性を現すことが認められた。
【００１８】
また、本発明になる鉄・クロム合金メッキ被覆層に微細な固体潤滑剤を固着させたアルミニウム材料も、同様な滑り摩耗試験において、その試験の摩擦速度の範囲で比摩耗量が少ないことが認められた。さらに、素地のアルミニウム合金が摩擦熱を伝達しやすくし、材料の表面の温度上昇が防がれていることも考えられ、本発明は優れた耐摩耗性材料を提供するものである。
【図面の簡単な説明】
【図１】滑り摩耗試験の結果を示すグラフで、異なる摩擦速度における本発明材料と対比材料とのそれぞれの比摩耗量を示す。[0001]
[Industrial application fields]
The present invention relates to an aluminum material having aluminum or an aluminum alloy as a base and iron / chromium alloy plating on the surface. Such aluminum materials are expected to be used more widely in various industrial fields such as the automobile industry.
[0002]
[Prior art]
Aluminum materials obtained by iron plating an aluminum substrate have been known so far. However, since iron plating has low hardness, it has been attempted to plate with iron containing chromium. It is known that steel containing 2 to 20% by weight of chromium reaches a hardness of 800 to 1200 HV. However, if iron containing chromium is plated on an aluminum substrate, the plated surface will crack.
[0003]
[Problems to be solved by the invention]
Therefore, the present invention provides an abrasion-resistant aluminum material that utilizes a plated surface of an aluminum material plated with iron / chromium alloy.
[0004]
[Means for Solving the Problems]
In the present invention, a coating of a thermoplastic resin such as PTFE or nylon is applied to the cracked iron / chromium alloy plating surface.
[0005]
To form such a film There are various ways, some of the film of melted thermoplastic resin penetrates into the cracks, solidifies at room temperature, which becomes the root of the coating to the plated surface of the film It is important that the adhesive strength of the can be increased.
[0006]
Such a thermoplastic resin film is liquefied during operation by frictional heat generated in the process of friction, serves as a lubricant, reduces the friction coefficient, and reduces the amount of wear. Further, since the film is solidified in the stopped state, there is no possibility of dust and the like being attached, and wear characteristics are improved.
[0007]
In the present invention, the cracked iron / chromium alloy plating surface is coated with a thermosetting resin dissolved in an organic solvent and thoroughly mixed with a solid lubricant having a crack width or finer than that. A film is formed and then heated to volatilize the solvent and solidify the thermosetting resin. The solid lubricant is fixed on the plated surface and in the crack through the solidified resin. In particular, the resin and lubricant that penetrates and adheres into the cracks become the roots of these films, and prevents the films from peeling off from the plated surface. In the process of friction and wear, the solid lubricant interposed between the friction surfaces acts to lower the friction coefficient and reduce the amount of wear.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Example 1
After a 2 mm thick aluminum alloy (JIS 5052) piece is subjected to normal plating pretreatment (degreasing, acid activity, alkali etching, acid activity, zinc substitution, sulfuric acid immersion, zinc substitution, etc.), the thickness is about 20 microns. Iron / chromium alloy plating containing about 15% by weight of chromium was applied under the following conditions.
[0009]
Liquid composition: Trichrome Plus (manufactured by Atotech Japan) was used as a base, and ferrous sulfate 40 g / 1 was added thereto.
Trichrome Plus
Basic flow chrome (skin tanning agent) 120g / 1
Ammonium formate 55g / 1
Ammonium bromate 10g / 1
Potassium chloride 54g / 1
Ammonium chloride 54g / 1
Boric acid 40g / 1
It corresponds to the composition of trivalent chromium plating.
Liquid temperature: 30 ° C
Negative electrode: Insoluble carbon used Current density: Treated with 15 A / dm 2 for 2 minutes, then treated with 10 A / dm 2 for 18 minutes
The hardness of the iron / chromium alloy plating coating layer is about 800 HV, and when the surface was observed with a scanning electron microscope, the surface of the plating coating layer had fine irregularities over the entire surface, and cracks were observed regardless of the irregularities. It was observed that it occurred in a turtle shell shape.
[0011]
Nylon 11 was impregnated in the crack of the surface of the aluminum alloy material piece by a pressure impregnation method, and a thin film of the thermoplastic resin was formed on the friction surface.
[0012]
This was used as a fixed test piece, S45C having a sorbite structure (HQT) was combined as a rotating test piece, and a contact pressure was 0.49 MPa. Using a PIN-RING type wear tester. A sliding wear test was conducted. The result was as shown in the curve shown as the material of the present invention in FIG.
[0013]
For comparison, the above-mentioned aluminum alloy pieces were similarly iron-plated and subjected to gas nitrosulphurizing treatment to produce contrast fixed test pieces. Since this comparative test piece was gradually cooled at a cooling rate of 5 ° C./min after the gas nitronitriding treatment, no crack was observed in the iron plating coating layer. Accordingly, the Nylon 11 thin film was not applied to the iron plating coating layer. This was subjected to a sliding wear test in the same manner as described above. As a result, the curve is shown as a contrast material in FIG.
[0014]
Example 2
An epoxy resin, which is a thermosetting resin, is dissolved in an organic solvent, and MoS 2 that is a fine solid lubricant having a particle size smaller than or equal to the width of a crack is added thereto, and after sufficient stirring, this is described above. It applied to the plating surface in which the crack of the aluminum alloy piece of Example 1 produced | generated. Subsequently, this was heated to about 150 ° C. to volatilize the solvent and solidify the epoxy resin.
[0015]
As a result, since the resin containing the solid lubricant entered the cracks and solidified, the film did not peel from the iron / chromium alloy plating surface as the root of the applied film.
[0016]
The inventive material according to this example showed a reduction in the friction coefficient and a reduction in the amount of wear in the sliding wear test in the same manner as the inventive material of Example 1 described above.
[0017]
【The invention's effect】
FIG. 1 shows an aluminum material having a cracked iron / chromium alloy plating coating layer on the outer surface of aluminum or an aluminum alloy according to the present invention and impregnating the iron / chromium alloy plating coating layer with a thermoplastic resin. As a result of the sliding wear test, it was confirmed that excellent wear characteristics were exhibited.
[0018]
In addition, the aluminum material in which the fine solid lubricant is fixed to the iron / chromium alloy plating coating layer according to the present invention is also found to have a small specific wear amount within the range of the friction speed in the same sliding wear test. It was. Furthermore, it is conceivable that the base aluminum alloy facilitates the transmission of frictional heat and the temperature rise of the surface of the material is prevented, and the present invention provides an excellent wear-resistant material.
[Brief description of the drawings]
FIG. 1 is a graph showing the results of a sliding wear test, showing specific wear amounts of a material of the present invention and a comparative material at different friction rates.
Claims (2)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21888997A JP3673886B2 (en) | 1997-07-09 | 1997-07-09 | Wear-resistant iron and chrome-plated aluminum material |
| US09/097,030 US6149790A (en) | 1997-07-04 | 1998-06-12 | Method of making iron-electroplated aluminum materials |
| EP98305172A EP0892088B1 (en) | 1997-07-04 | 1998-06-30 | Method of making iron electroplated aluminium materials |
| DE69801404T DE69801404T2 (en) | 1997-07-04 | 1998-06-30 | Process for the production of aluminum-clad aluminum materials |
| CN98103321A CN1122118C (en) | 1997-07-04 | 1998-07-03 | Method of making iron-electroplated aluminium materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21888997A JP3673886B2 (en) | 1997-07-09 | 1997-07-09 | Wear-resistant iron and chrome-plated aluminum material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1129893A JPH1129893A (en) | 1999-02-02 |
| JP3673886B2 true JP3673886B2 (en) | 2005-07-20 |
Family
ID=16726900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21888997A Expired - Fee Related JP3673886B2 (en) | 1997-07-04 | 1997-07-09 | Wear-resistant iron and chrome-plated aluminum material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3673886B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100360536B1 (en) * | 1999-12-29 | 2002-11-13 | 대우종합기계 주식회사 | Hard chronium coatings and manufacturing method thereof |
| US11141501B2 (en) * | 2016-11-16 | 2021-10-12 | Dai Nippon Printing Co., Ltd. | Gasifier for sterilizer |
-
1997
- 1997-07-09 JP JP21888997A patent/JP3673886B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1129893A (en) | 1999-02-02 |
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