JPS6286141A - Aluminum alloy having superior pitting corrosion resistance - Google Patents

Aluminum alloy having superior pitting corrosion resistance

Info

Publication number
JPS6286141A
JPS6286141A JP20259885A JP20259885A JPS6286141A JP S6286141 A JPS6286141 A JP S6286141A JP 20259885 A JP20259885 A JP 20259885A JP 20259885 A JP20259885 A JP 20259885A JP S6286141 A JPS6286141 A JP S6286141A
Authority
JP
Japan
Prior art keywords
aluminum alloy
corrosion resistance
pitting corrosion
alloy
superior pitting
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
JP20259885A
Other languages
Japanese (ja)
Inventor
Kikuro Toyose
豊瀬 喜久郎
Koichi Hatanaka
畑中 孝一
Masanobu Fukui
福井 正信
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel 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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP20259885A priority Critical patent/JPS6286141A/en
Publication of JPS6286141A publication Critical patent/JPS6286141A/en
Pending legal-status Critical Current

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  • Prevention Of Electric Corrosion (AREA)

Abstract

PURPOSE:To obtain an Al alloy having superior pitting corrosion resistance in water by adding specified amounts of Cu, Mn and Cr to Al. CONSTITUTION:This Al alloy consists of 0.05-0.8wt% Cu, 0.5-1.5wt% Mn, 0.05-0.35wt% Cr and the balance Al. The alloy has superior pitting corrosion resistance even when used in water, especially seawater having high corrosive action on Al alloys. The alloy also has satisfactory strength, so it can be utilized in various fields such as the fields of a ship, vehicles, construction and foodstuff.

Description

【発明の詳細な説明】 「産業上の利用分野] 本発明は耐孔蝕性に優れたアルミニウム合金に司し、さ
らに詳しくは、水環境、特に海水等アルミニウムまたは
アルミニウム合金に対して腐蝕性の厳しい使用環境にお
いて優れた耐孔蝕性を示し、船舶、車輌、建設、食品等
の分野において利用が多い耐孔蝕性に優れたアルミニウ
ム合金に関する。
Detailed Description of the Invention "Industrial Field of Application" The present invention relates to an aluminum alloy with excellent pitting resistance, and more specifically, to an aluminum alloy with excellent pitting resistance. The present invention relates to an aluminum alloy with excellent pitting resistance that exhibits excellent pitting resistance in harsh usage environments and is often used in the fields of ships, vehicles, construction, food, etc.

[従米枝術J 一般的に、アルミニウムおよびアルミニウム合金!十卆
イハ尖面に11LH化の本人り4Y古瞠か■ゑ涛′十ム
ため、大気雰囲気においては実用老優れた耐蝕性を示し
、日用品等に幅広く使用されている。
[Jubei Edjutsu J Generally, aluminum and aluminum alloys! Because it has 11LH on its apical surface, it shows excellent corrosion resistance in the atmosphere and is widely used in daily necessities.

□しかしながら、水環境において使用される用途におい
ては、JISで規定されている3×××系(AI−Mn
系、Al−Mn−Mg系)、5×××系(AI−Mg系
)或いは6×××系(AI  Mg−3i系)の各合金
が比較的良好な耐蝕性を示すので使用される場合がある
が、必ずしも満足で終るものではなく、特に耐孔蝕性に
関して改善が期待されている。
□However, in applications used in water environments, the 3×XX system (AI-Mn
These alloys are used because they exhibit relatively good corrosion resistance. However, it is not always satisfactory, and improvements are expected, especially in terms of pitting resistance.

[発明が解決しようとする問題点1 本発明は上記に説明した従来のアルミニウム合金におけ
る耐蝕性に鑑み、本発明者が鋭意研究を行なった結果、
水環境、特に海水等のアルミニウム合金に対して腐蝕性
の厳しい環境において使用しても、優れた耐孔蝕性を示
すアルミニウム合金を開発したのである。
[Problem to be Solved by the Invention 1] The present invention has been made as a result of intensive research conducted by the present inventor in view of the corrosion resistance of the conventional aluminum alloys explained above.
We have developed an aluminum alloy that exhibits excellent pitting corrosion resistance even when used in an aqueous environment, especially seawater, which is highly corrosive to aluminum alloys.

[問題点を解決するための手段] 本発明に係る耐孔蝕性に優れたアルミニウム合金の特徴
とするところは、 Cu 0.05〜0.8wt%、Mn 005−1,5
wt%、Cr 0.05−0,35wt% を含有し、残部Alおよび不可避不純物からなることに
ある。
[Means for solving the problems] The aluminum alloy with excellent pitting resistance according to the present invention is characterized by: Cu 0.05-0.8 wt%, Mn 005-1,5
wt%, Cr 0.05-0.35 wt%, and the balance consists of Al and inevitable impurities.

本発明に係る耐孔蝕性に優れたアルミニウム合金につい
て、以下詳細に説明する。
The aluminum alloy with excellent pitting resistance according to the present invention will be described in detail below.

先ず、本発明に係る耐孔蝕性に優れたアルミニウム合金
の含有成分および成分割合について説明する。
First, the components and component ratios of the aluminum alloy with excellent pitting resistance according to the present invention will be explained.

Cuはアルミニウム合金を電汽化学的に責とし、かつ、
強度を高める元素であり、含有量が0.05wt%未満
ではこのような効果は充分ではなく、また、0.8wt
%を越えて含有されると粒界腐蝕感受性が増大するよう
になる。よって、Cu含有量は0.05〜0.8wt%
とする。
Cu is responsible for aluminum alloy electrically and chemically, and
It is an element that increases strength, and if the content is less than 0.05 wt%, this effect is not sufficient, and if the content is less than 0.8 wt%,
If the content exceeds %, susceptibility to intergranular corrosion increases. Therefore, the Cu content is 0.05 to 0.8 wt%
shall be.

MnはCuと同様にアルミニウム合金を電気化学的に貴
とし、かつ、不可避的に含有している不純物のFeをA
I、(MnFe)の形として固定するので、Feが軟点
となり発生する孔蝕を低減でき、さらに、耐孔蝕性を改
善すると同時に強度を高める元素であり、含有量が0.
5IIIL%未満ではこのような効果は小さく、また、
1.5wt%を越えて含有されると粗大な金属間化合物
が生成して欠陥の原因となる。よって、Mn含有量は0
.5〜1.5u+L%とする。
Like Cu, Mn electrochemically nobles aluminum alloys and removes Fe, an unavoidable impurity.
Since Fe is fixed in the form of (MnFe), it is possible to reduce pitting that occurs as Fe becomes a soft point.Furthermore, it is an element that improves pitting resistance and increases strength at the same time, and its content is 0.
Below 5IIIL%, this effect is small, and
If the content exceeds 1.5 wt%, coarse intermetallic compounds will be formed and cause defects. Therefore, the Mn content is 0
.. 5 to 1.5u+L%.

C「は強度を高めると共に耐蝕性を向上させる元素であ
り、含有量が0.Oht%未満ではこの効果は認められ
ず、また、0,35wt%を越えて含有されるとその効
果は飽和してしまい無意味であり、さらに、Mnと同じ
く粗大な金属間化合物を生成するので好ましくない。よ
って、Cr含有量は0.05−0.35wt%とする。
C is an element that increases strength and improves corrosion resistance; this effect is not observed when the content is less than 0.000%, and the effect is saturated when the content exceeds 0.35wt%. Furthermore, it is not preferable because it produces coarse intermetallic compounds like Mn.Therefore, the Cr content is set to 0.05-0.35 wt%.

これらの必須成分以外に、Ti等の鋳造組織を微細化し
鋳造性を向上させる元素を含有させることができる。
In addition to these essential components, elements such as Ti that refine the casting structure and improve castability can be included.

なお、Feは不可避不純物であり、含有量は0.3wt
%以下に規制することが望ましい。
Note that Fe is an unavoidable impurity, and the content is 0.3wt.
It is desirable to limit the amount to less than %.

[実施例J 次に、本発明に係る耐孔蝕性に優れたアルミニウム合金
の実施例を説明する。
[Example J Next, an example of an aluminum alloy having excellent pitting resistance according to the present invention will be described.

実施例 第1表に示す含有成分および成分割合のアルミニウム合
金を常法により溶製し、鋳造後、3n+m厚さまで熱間
圧延を行ない、その後冷開圧延により厚さ0.5III
111に仕上げた。
Example An aluminum alloy having the components and proportions shown in Table 1 was melted by a conventional method, and after casting, it was hot-rolled to a thickness of 3n+m, and then cold-opened to a thickness of 0.5III.
I finished it at 111.

この0.5順厚さの冷開圧延板を7cmX15cmの寸
法に切り出し、J Is  Z 2371に規定されて
いる塩水噴霧試験を実施した。
This cold-open rolled plate with a regular thickness of 0.5 cm was cut into a size of 7 cm x 15 cm and subjected to a salt spray test as specified in JIS Z 2371.

2000時間経過後の各試験板について、腐蝕生成物を
30%HNO3溶液で除去し、顕微鏡観察により孔蝕深
さを調査した。耐孔蝕性の評価は孔蝕深さにより次のよ
うに評価した。
For each test plate after 2000 hours, corrosion products were removed with a 30% HNO3 solution, and the depth of pitting was investigated by microscopic observation. The pitting resistance was evaluated based on the pitting depth as follows.

最大孔蝕深さ        評価 0.05μ以下        ◎ 0.05〜0.1μ         00.1〜0.
15μ未満       Δ0.15μ以上     
   × この第1表かに示す通り、本発明に係る耐孔蝕性に優れ
たアルミニウム合金は比較例より大幅に耐孔蝕性が改善
されていることがわかる。
Maximum pitting depth Evaluation 0.05μ or less ◎ 0.05~0.1μ 00.1~0.
Less than 15μ Δ0.15μ or more
x As shown in Table 1, it can be seen that the aluminum alloy with excellent pitting resistance according to the present invention has significantly improved pitting resistance compared to the comparative example.

[発明の効果] 以上説明したように、本発明に係る耐孔蝕性に優れたア
ルミニウム合金は上記の構成であるから、優れた耐孔蝕
性を有し、強度をも配慮したもので、船舶、車輌、建設
、食品等の分野において広く利用できるものである。
[Effects of the Invention] As explained above, since the aluminum alloy with excellent pitting resistance according to the present invention has the above-mentioned structure, it has excellent pitting corrosion resistance and also takes into consideration strength. It can be widely used in the fields of ships, vehicles, construction, food, etc.

Claims (1)

【特許請求の範囲】 Cu0.05〜0.8wt%、Mn0.5〜1.5wt
%、Cr0.05〜0.35wt% を含有し、残部Alおよび不可避不純物からなることを
特徴とする耐孔蝕性に優れたアルミニウム合金。
[Claims] Cu0.05-0.8wt%, Mn0.5-1.5wt
%, Cr: 0.05 to 0.35 wt%, and the remainder consisting of Al and unavoidable impurities.
JP20259885A 1985-09-13 1985-09-13 Aluminum alloy having superior pitting corrosion resistance Pending JPS6286141A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20259885A JPS6286141A (en) 1985-09-13 1985-09-13 Aluminum alloy having superior pitting corrosion resistance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20259885A JPS6286141A (en) 1985-09-13 1985-09-13 Aluminum alloy having superior pitting corrosion resistance

Publications (1)

Publication Number Publication Date
JPS6286141A true JPS6286141A (en) 1987-04-20

Family

ID=16460116

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20259885A Pending JPS6286141A (en) 1985-09-13 1985-09-13 Aluminum alloy having superior pitting corrosion resistance

Country Status (1)

Country Link
JP (1) JPS6286141A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0339438A (en) * 1989-07-05 1991-02-20 Nikkei Giken:Kk Pitting corrosion-resistant aluminum alloy and its manufacture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0339438A (en) * 1989-07-05 1991-02-20 Nikkei Giken:Kk Pitting corrosion-resistant aluminum alloy and its manufacture

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