JPH04180594A - Aluminum alloy sheet - Google Patents

Aluminum alloy sheet

Info

Publication number
JPH04180594A
JPH04180594A JP30728190A JP30728190A JPH04180594A JP H04180594 A JPH04180594 A JP H04180594A JP 30728190 A JP30728190 A JP 30728190A JP 30728190 A JP30728190 A JP 30728190A JP H04180594 A JPH04180594 A JP H04180594A
Authority
JP
Japan
Prior art keywords
iron
sheet
aluminum alloy
alloy
alloy plate
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
Application number
JP30728190A
Other languages
Japanese (ja)
Inventor
Shigeo Itano
板野 重夫
Yuji Furusawa
古沢 雄二
Toyoaki Yasui
豊明 安井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP30728190A priority Critical patent/JPH04180594A/en
Publication of JPH04180594A publication Critical patent/JPH04180594A/en
Pending legal-status Critical Current

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  • Electroplating And Plating Baths Therefor (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

PURPOSE:To produce an Al alloy sheet excellent in appearance and useful for the outer panel of the automobile without generating a crater in electrodeposition coating by thinly plating the surface of an Al alloy sheet with Fe or an Fe alloy. CONSTITUTION:When a lightweight Al sheet as the automobile outer panel is produced, an Al alloy sheet is degreased, cleaned and then surface-activated. The treated sheet is dipped in an aq. FeSO4 soln. contg. Fe<2+> ion, a current is applied between the sheet as a cathode and an anode of Pb, etc., and a thin Fe plating layer is formed on the sheet surface. The Fe plating layer forms the fine granular crystal of Zn2Fe(PO4)2.4H2O in the phosphating of sheet before coating, hence a crater is not generated in electrodeposition coating, and a coating film excellent in appearance is formed.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は表面に鉄又は鉄合金を被覆処理したアルミニウ
ム合金板に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an aluminum alloy plate whose surface is coated with iron or an iron alloy.

〔従来の技術〕[Conventional technology]

従来のアルミニウム合金製の板は、これを例えば自動車
用の外板(パネル)として使う場合等にはアルミニウム
及びその合金成分である珪素、マグネシウムなどは酸素
との親和力が大きいために、金型によるプレス成形時に
金型の鉄成分との間に酸化凝着が生じ易い欠点がある。
Conventional aluminum alloy plates, when used as outer panels for automobiles, for example, are difficult to mold due to the fact that aluminum and its alloy components, such as silicon and magnesium, have a strong affinity for oxygen. It has the disadvantage that oxidation adhesion tends to occur between it and the iron component of the mold during press molding.

又、パネルの溶接4合時に、アルミニウム合金板の表面
の酸化膜が非常に安定なために、これが溶接4合時の障
壁となって、接合強度が発揮できない問題がある。
Furthermore, since the oxide film on the surface of the aluminum alloy plate is very stable during the fourth welding of the panel, this becomes a barrier during the fourth welding, and there is a problem in that the joint strength cannot be achieved.

さらに、塗装下地としてのりん酸塩処理を施こす場合、
りん酸塩結晶の成長速度が遅く、かつ生成するりん酸塩
結晶は針状結晶のホパイトが主体となるために、電着塗
装時にクレータを生じ易く塗装外観を損う欠点を有して
いた。
Furthermore, when applying phosphate treatment as a base for painting,
Since the growth rate of phosphate crystals is slow and the phosphate crystals produced are mainly hopite needle-shaped crystals, they have the disadvantage that craters tend to form during electrodeposition coating, impairing the appearance of the coating.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

本発明は上記技術水準に鑑み、従来のアルミニウム合金
の有する不具合のないアルミニウム合金板を提供しよう
とするものである。
In view of the above-mentioned state of the art, the present invention aims to provide an aluminum alloy plate free from the defects of conventional aluminum alloys.

〔課題を解決するための手段〕[Means to solve the problem]

本発明はアルミニウム合金製の板材の表面に鉄又は鉄合
金を被覆してなることを特徴とするアルミニウム合金板
である。
The present invention is an aluminum alloy plate characterized in that the surface of the aluminum alloy plate is coated with iron or an iron alloy.

本発明はアルミニウム合金板は、アルミニウム合金板を
予じめ表面活性化したのち、その表面に鉄又は鉄合金を
極く薄く被覆することによって製造することができる。
According to the present invention, the aluminum alloy plate can be manufactured by surface-activating the aluminum alloy plate in advance and then coating the surface with a very thin layer of iron or iron alloy.

本発明でいるアルミニウム合金板とは純アルミニラム板
、JISで規定されている全てのアルミニウム合金板を
意味する。また、鉄及び鉄合金とは純鉄及びMn、 Z
n、  P、 B、 Ni、 Cr、 Co。
The aluminum alloy plate used in the present invention means a pure aluminum plate and all aluminum alloy plates specified by JIS. In addition, iron and iron alloys include pure iron, Mn, Z
n, P, B, Ni, Cr, Co.

Mo、  V、 Sm、 Nbなどの合金元素を1種以
上を1〜2Qwt%を含有する鉄合金を意味する。
It means an iron alloy containing 1 to 2 Qwt% of one or more alloying elements such as Mo, V, Sm, and Nb.

〔作 用〕[For production]

アルミニウム合金板の表面に被覆された鉄又は鉄合金は
アルミニウム合金よりも硬いために、鉄主体の金型との
間の摩擦係数が低下すること及び鉄又は鉄合金はアルミ
ニウム合金に較べて酸素との親和性が弱いために、金型
に酸化凝着することがない。又、鉄又は鉄合金がアルミ
ニウム合金に較べて酸化しにくいことはアルミニウム合
金板上に被覆された状態の鉄又は鉄合金被膜の表面には
極く薄い鉄酸化膜しか生成していないので、溶接4合時
に障壁となることもなく、大きな接合強度が得られる。
Since the iron or iron alloy coated on the surface of the aluminum alloy plate is harder than the aluminum alloy, the coefficient of friction between it and the iron-based mold decreases, and the iron or iron alloy has a lower resistance to oxygen than the aluminum alloy. Because of its weak affinity, it does not oxidize and adhere to the mold. In addition, iron or iron alloys are less susceptible to oxidation than aluminum alloys because only a very thin iron oxide film is formed on the surface of the iron or iron alloy coating that is coated on the aluminum alloy plate. It does not become a barrier at the time of 4-coupling, and high bonding strength can be obtained.

さらに、アルミニウム合金板上の鉄又は鉄合金被膜は、
塗装前のりん酸塩処理時に微細な粒状結晶であるフォス
フォヒライト[Zn、Fe(FD=)z・4LO]を生
成し、電着塗装時にクレータを生成することなく、塗装
時に美麗な外観を提供することができる。
Furthermore, the iron or iron alloy coating on the aluminum alloy plate is
Fine granular crystals of phosphohylite [Zn, Fe(FD=)z・4LO] are generated during phosphate treatment before painting, and no craters are created during electrodeposition painting, resulting in a beautiful appearance when painting. can be provided.

〔実施例〕〔Example〕

板厚2mmのAl−Mg合金板(2,5wt%Mg、0
.2wE%[:r、 0.3 vt%Fe、 o、 2
5 wt%Si、残: Al)をアルカリ水溶液で脱脂
及び表面活性化(35wt%HNO3水溶液に1〜3分
浸漬)し、水洗したのち、Fe2+イオンを含む硫酸塩
水溶液(FeSO。
Al-Mg alloy plate with a plate thickness of 2 mm (2.5 wt% Mg, 0
.. 2wE%[:r, 0.3 vt%Fe, o, 2
After degreasing and surface activation (immersion in 35 wt% HNO3 aqueous solution for 1 to 3 minutes) with an alkaline aqueous solution and washing with water, a sulfate aqueous solution containing Fe2+ ions (FeSO.

7)120: 300 g/I!、 Na−3O4: 
l 00 g/l。
7) 120: 300 g/I! , Na-3O4:
l 00 g/l.

pH:1.8)中でAl−Mg合金板を陰極とし、Pb
合金板を陽極として、電気めっき(電流密度:100−
A/dm’、極間距離: 50 mm、浴温度:50゜
±5℃)を行い、アルミニウム合金板上に鉄めっきを施
こし、種々の性能試験を行った。
pH: 1.8), an Al-Mg alloy plate was used as a cathode, and Pb
Electroplating (current density: 100-
A/dm', distance between poles: 50 mm, bath temperature: 50°±5°C), iron plating was applied on an aluminum alloy plate, and various performance tests were conducted.

その結果を第1図に示す。即ち、金型との非凝着性、溶
接々合強度及びりん酸塩処理後の耐食性を、鉄めっき膜
厚との関係を調べたところ、いずれの性質も膜厚の増大
とともに急激に向上し、はVl、5g/m2片面程度で
満足のいく性能を発揮することが判った。
The results are shown in FIG. In other words, when we investigated the relationship between non-adhesion to the mold, weld joint strength, and corrosion resistance after phosphate treatment, we found that all properties improved rapidly as the film thickness increased. , was found to exhibit satisfactory performance at a Vl of about 5 g/m2 on one side.

たゾし、りん酸塩処理後の耐食性は約6g/m2片面以
上になると、未反応の鉄が残存するために、母材のアル
ミニウム合金との間でガルバニックコロ−ジョンが進行
し易くなり、逆に耐食性が劣化してくる。従って、アル
ミニウム合金板上に施こす鉄めっき厚さは1.5〜6g
/m2片面が適当であるといえる。
However, when the corrosion resistance after phosphate treatment is approximately 6g/m2 or more on one side, galvanic corrosion tends to progress between the aluminum alloy and the base metal because unreacted iron remains. On the contrary, corrosion resistance deteriorates. Therefore, the thickness of iron plating applied on the aluminum alloy plate is 1.5 to 6 g.
/m2 on one side is appropriate.

次に、板厚2mmの上記と同じAl−Mg合金板をアル
カリ水溶液で上記と同様に脱脂並びに表面活性化し、水
洗後、乾燥したのち、真空蒸着室に導いて基板を250
℃に予熱後、鉄を蒸着めっきした。
Next, the same Al-Mg alloy plate as above with a thickness of 2 mm was degreased and surface activated with an alkaline aqueous solution in the same manner as above, washed with water, dried, and then introduced into a vacuum deposition chamber to form a substrate at 250° C.
After preheating to ℃, iron was deposited and plated.

この鉄蒸着めっきAl−Mg合金板の各種性能をめっき
厚さの関係で調べたところ、前記の第1図と同じ結果が
得られた。即ち、蒸着鉄めっきを施こす場合も、めっき
厚さとしては1.5〜6g / m 2片面が適するこ
とが判った。
When various performances of this iron vapor-deposited Al--Mg alloy plate were investigated in relation to the plating thickness, the same results as those shown in FIG. 1 above were obtained. That is, it was found that even when applying vapor deposited iron plating, a plating thickness of 1.5 to 6 g/m2 on one side is suitable.

又、電気めっき法により鉄−マンガン合金をアルミニウ
ム合金板上に施こした例について説明する。
Further, an example in which an iron-manganese alloy is applied on an aluminum alloy plate by electroplating will be explained.

板厚2mmのアルミニウム合金板を上記と同様にアルカ
リ水溶液で脱脂並びに表面活性化を行い、水洗したのち
、Fe” 50 g/ It、 Mn” 2g/Ilを
含む硫酸塩水溶液(pH:1.8)中でアルミニウム合
金板を陰極とし、pb金合金陽極として電気めっきを施
こしFe99%−Mn 1%の合金tつきを施こした。
An aluminum alloy plate with a thickness of 2 mm was degreased and surface activated with an alkaline aqueous solution in the same manner as above, washed with water, and then treated with a sulfate aqueous solution (pH: 1.8) containing 50 g/It of Fe and 2 g/Il of Mn. ), an aluminum alloy plate was used as a cathode, and electroplating was performed as a PB gold alloy anode to coat an alloy of 99% Fe-1% Mn.

この鉄合金めっきの厚さと各種性能との関係は第1図は
はり同様の結果が得られた。即ち、Fe−Mn合金めっ
きの場合も、厚さとしては1.5〜6g/a+”片面が
適することが判った。
Regarding the relationship between the thickness of this iron alloy plating and various performances, results similar to those shown in Figure 1 were obtained. That is, in the case of Fe--Mn alloy plating as well, it was found that a thickness of 1.5 to 6 g/a+'' on one side is suitable.

又、上述の電気めっき法による鉄又は鉄・マンガン合金
をアルミニウム合金板上に施こす方法において、以下の
方法についても実施した。
Furthermore, in the method of applying iron or iron-manganese alloy onto an aluminum alloy plate by the above-mentioned electroplating method, the following method was also carried out.

板厚2mmのアルミニウム合金板をアルカリ水溶液で脱
脂、エツチング後、脱スマット(62%llN0.水溶
液、液温:30℃9時間:100秒)し、引続きジンケ
ート処理(奥野製薬製サブスターZN−1: 300T
nf/Il、液温:25℃。
An aluminum alloy plate with a thickness of 2 mm was degreased and etched with an alkaline aqueous solution, then desmutted (62% 11N0. aqueous solution, liquid temperature: 30°C, 9 hours: 100 seconds), and then zincate treated (Substar ZN-1 manufactured by Okuno Pharmaceutical Co., Ltd.). : 300T
nf/Il, liquid temperature: 25°C.

時間:40秒)により、Znを置Ieつきし、その後、
酸性水溶液により表面を活性化し、水洗したのち、Fe
2+50g/lを含む硫酸水溶液並びにるFe” 50
 g/ l、 Mn” 2 g/ i!を含む硫酸水溶
液中でアルミニウム合金板を陰極とし、pb金合金陽極
としてそれぞれ電気めっきを施し、Fe並びにFe99
%−Mn 1%の合金を作成した。
Time: 40 seconds) to place Zn, and then
After activating the surface with an acidic aqueous solution and washing with water, Fe
Aqueous sulfuric acid solution containing 2+50g/l of Fe” 50
An aluminum alloy plate was used as a cathode in a sulfuric acid aqueous solution containing Mn” 2 g/l, Mn” 2 g/i!, and electroplated as a PB gold alloy anode.
%-Mn 1% alloy was prepared.

これらの鉄又は鉄合金めっきの厚さと各種性能との関係
は第1図とはゾ同様の結果が得られた。即ち、Fe又は
Fe −Mn合金島つきの厚さとしては、1.5〜6 
g/1片面が適することが判った。
Regarding the relationship between the thickness of these iron or iron alloy platings and various performances, results similar to those shown in FIG. 1 were obtained. That is, the thickness of the Fe or Fe-Mn alloy islands is 1.5 to 6.
It was found that g/1 single side is suitable.

〔発明の効果〕〔Effect of the invention〕

以上記したように、アルミニウム合金板に鉄又は鉄合金
を極く薄くとつきすることにより、特に自動車用外板等
として使用する際に、■金型成形時に金型への酸化・凝
着が防止でき、■溶接々合時の強度が増大し構造物とし
ての信頼性が増大し、■塗装下地としてのりん酸塩処理
時に微細な粒状のりん酸塩結晶(フォスフォヒライト)
を生成するので、電着塗装時にクレータを生ずることが
ない。
As mentioned above, by applying a very thin layer of iron or iron alloy to an aluminum alloy plate, especially when used as an outer panel for automobiles, ■ oxidation and adhesion to the mold during molding can be prevented. ■ Increased strength during welding and increased reliability as a structure; ■ Fine granular phosphate crystals (phosphohylite) during phosphate treatment as a base for painting.
, so no craters are created during electrodeposition coating.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例のアルミニウム合金板の効果
を示す図表である。
FIG. 1 is a chart showing the effects of an aluminum alloy plate according to an embodiment of the present invention.

Claims (1)

【特許請求の範囲】[Claims] アルミニウム合金製の板材の表面に鉄又は鉄合金を被覆
してなることを特徴とするアルミニウム合金板。
An aluminum alloy plate comprising an aluminum alloy plate whose surface is coated with iron or an iron alloy.
JP30728190A 1990-11-15 1990-11-15 Aluminum alloy sheet Pending JPH04180594A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30728190A JPH04180594A (en) 1990-11-15 1990-11-15 Aluminum alloy sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30728190A JPH04180594A (en) 1990-11-15 1990-11-15 Aluminum alloy sheet

Publications (1)

Publication Number Publication Date
JPH04180594A true JPH04180594A (en) 1992-06-26

Family

ID=17967243

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30728190A Pending JPH04180594A (en) 1990-11-15 1990-11-15 Aluminum alloy sheet

Country Status (1)

Country Link
JP (1) JPH04180594A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6328530B1 (en) * 1998-03-18 2001-12-11 Hitachi, Ltd. MG alloy member and its use
JP2014037587A (en) * 2012-08-17 2014-02-27 Ota Mekki Kogyo Co Ltd Electroplating method of pure iron to aluminum or aluminum alloy material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6328530B1 (en) * 1998-03-18 2001-12-11 Hitachi, Ltd. MG alloy member and its use
JP2014037587A (en) * 2012-08-17 2014-02-27 Ota Mekki Kogyo Co Ltd Electroplating method of pure iron to aluminum or aluminum alloy material

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