JPS594495B2 - Al alloy plate material with excellent pitting corrosion resistance - Google Patents
Al alloy plate material with excellent pitting corrosion resistanceInfo
- Publication number
- JPS594495B2 JPS594495B2 JP3112978A JP3112978A JPS594495B2 JP S594495 B2 JPS594495 B2 JP S594495B2 JP 3112978 A JP3112978 A JP 3112978A JP 3112978 A JP3112978 A JP 3112978A JP S594495 B2 JPS594495 B2 JP S594495B2
- Authority
- JP
- Japan
- Prior art keywords
- plate material
- alloy plate
- corrosion resistance
- pitting corrosion
- alloy
- 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.)
- Expired
Links
Description
【発明の詳細な説明】
この発明は、すぐれた成形加工性を有し、海水や淡水中
、特にＣｕイオンなどの重金属イオンを含有する水中に
おいて、すぐれた耐孔食性を示すＡ［合金板材に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alloy sheet material having excellent formability and excellent pitting corrosion resistance in seawater and freshwater, especially in water containing heavy metal ions such as Cu ions. It is something.
従来、一般に、海水や淡水にさらされる部材の製造には
、Ｍｎ：ｌ〜１．５％を含有するＡ−Ａ合金板材、すな
わちＪＩ８３００３合金板材が使用されている。BACKGROUND ART Conventionally, generally, an A-A alloy plate containing 1 to 1.5% of Mn, that is, a JI83003 alloy plate, has been used to manufacture members exposed to seawater or fresh water.
この３００３合金板材は、Ｎｎ含有によって、すぐれた
成形加工性を有し、かつ使用中に自然発生する酸化皮膜
によって耐食性も良好であり、さらに比較的高い強度を
有するものである。This 3003 alloy plate material has excellent formability due to the Nn content, good corrosion resistance due to the oxide film that naturally occurs during use, and relatively high strength.
しかし、この３００３合金板材においては、特にＣｕイ
オンなどの重金属イオンを含有する水にさらされると、
多数の微細な孔食が発生するのを避けることができない
ものであった。However, when this 3003 alloy plate material is exposed to water containing heavy metal ions such as Cu ions,
The occurrence of a large number of fine pitting corrosions was unavoidable.
本発明者等は、上述のような観点から、成形加工性にす
ぐれた３００３合金板材に着目し、これに耐孔食性を付
与すべく研究を行なった結果、重量％で（以下％は重量
％を示す）、
Ｍｎ：１〜１．５％、
Ｚｎ 二 〇、２〜１％、
を含有し、残りがＡｌと不可避不純物からなる組成を有
するＡＡ合金板材は、３００３合金と同等の成形加工性
を有し、特に重金属イオンを含有する水中において、す
ぐれた耐孔食性を示すという知見を得たのである。From the above-mentioned viewpoint, the present inventors focused on 3003 alloy plate material with excellent formability and conducted research to impart pitting corrosion resistance to it. AA alloy sheet material containing Mn: 1 to 1.5%, Zn 20, 2 to 1%, and the remainder consisting of Al and unavoidable impurities has the same formability as 3003 alloy. They found that it has excellent pitting corrosion resistance, especially in water containing heavy metal ions.
この発明は、上記知見にもとづいてなされたものであっ
て、以下に成分組成を上記の通りに限定した理由を説明
する。This invention was made based on the above knowledge, and the reason why the component composition was limited as described above will be explained below.
（ａ） Ｍｎ
Ｍｎ成分には、Ａｌと結合して、素地中に微細に分散析
出するＡ ｌ−Ｍｎ系化合物を形成し、もって板材の成
形加工性および強度を向上させる作用があるが、その含
有量が１％未満では前記作用に所望の効果が得られず、
一方１．５％を越えて含有させると、前記Ａｌ−Ｍｎ化
合物が粗大化し、成形加工性に劣化傾向が現われるよう
になることから、その含有量を１〜１．５％と定めた。(a) Mn The Mn component has the effect of combining with Al to form an Al-Mn compound that is finely dispersed and precipitated in the base material, thereby improving the formability and strength of the plate material. If the content is less than 1%, the desired effect cannot be obtained,
On the other hand, if the Al-Mn compound is contained in excess of 1.5%, the Al-Mn compound becomes coarse and moldability tends to deteriorate, so the content is set at 1 to 1.5%.
（ｂ）Ｚｎ
Ｚｎ成分には、素地に固溶して、板材の表面に自然発生
的に形成される酸化皮膜の厚さを極力薄い状態に保持し
、その腐食形態を全面腐食型とし、これによって局部的
溶解および孔食発生を抑制する作用があるが、その含有
量が０．２％未満では前記作用に所望の効果が得られず
、一方１％を越えて含有させると、不均一腐食が発生す
るようになると共に、腐食量が増大するようになること
から、その含有量を０．２〜１％と定めた。(b) Zn The Zn component is dissolved in the base material, and the thickness of the oxide film that is naturally formed on the surface of the plate material is kept as thin as possible, and the corrosion form is a general corrosion type. has the effect of suppressing local dissolution and pitting corrosion, but if the content is less than 0.2%, the desired effect cannot be obtained, while if the content exceeds 1%, uneven corrosion may occur. The content was determined to be 0.2 to 1% because the amount of corrosion increases as well.
つぎに、この発明のＡＡ合金板材を実施例により具体的
に説明する。Next, the AA alloy plate material of the present invention will be specifically explained using examples.
実施例
通常の溶解法により、それぞれ第１表に示される成分組
成をもったＡ１合金溶湯を調製した後、インゴットに鋳
造し、ついで通常の条件にて均熱化処理、熱間圧延、お
よび冷間圧延を施して、いずれも板厚：１ｍ７＋！を有
する本発明Ａ１合金板材１〜３およびＺｎ含有量がこの
発明の範囲から外れた比較Ａ１合金板材１，２をそれぞ
れ製造した。EXAMPLE After preparing A1 alloy molten metals having the compositions shown in Table 1 by the usual melting method, they were cast into ingots, and then subjected to soaking treatment, hot rolling, and cooling under normal conditions. All plate thickness: 1m7+ by inter-rolling! Invention A1 alloy sheet materials 1 to 3 having the following properties and comparative A1 alloy sheet materials 1 and 2 having Zn contents outside the range of the present invention were manufactured, respectively.
つぎに、この結果得られた本発明ＡＡ合金板材１〜３お
よび比較Ａ１合金材１，２について、（ａ） ５ｐｐ
ｍのＣｕ＋＋イオンを含有させた６０℃の３％ＮａＣｌ
水溶液中に１週間浸漬保持のＮａＣｌ水溶液浸漬試験、
（ｂ） ５１）Ｉ）ＩＩＩのＣｕ＋＋イオンを含有さ
せた３０℃の水道水中に１週間浸漬保持の水道水浸漬試
験、・（ｃ）１６時間のＪＩＳ−ＣＡＳＳ試験、を行な
い、それぞれ腐食量、最大孔食深さ、および孔食数を測
定した。Next, regarding the resulting AA alloy sheets 1 to 3 of the present invention and comparative A1 alloy materials 1 and 2, (a) 5pp
3% NaCl at 60°C containing m Cu++ ions
NaCl aqueous solution immersion test, immersed in an aqueous solution for one week; (b) Tap water immersion test, immersed in 30°C tap water containing Cu++ ions of 51)I) III for one week; (c) 16 hours. A JIS-CASS test was conducted to measure the amount of corrosion, maximum pitting depth, and number of pitting corrosion.
これらの測定結果を第２表に示した。The results of these measurements are shown in Table 2.
第２表に示される結果から、本発明Ａ１合金板材１〜３
は、いずれも最も苛酷な使用環境条件に相当するＮａＣ
ｌ水溶液浸漬試験や水道水浸漬試験、さらにＣＡＳＳ試
験において、腐食量を増加させることなく、すぐれた耐
孔食性を示すのに対して、Ｚｎを含有しない比較ＡＡ合
金板材１においては、多数の孔食が発生し、その孔食も
深いものであり、またＺｎの含有量がこの発明の範囲を
越えて高い比較Ａ１合金板材２においては、相対的に多
数の孔食発生が見られるばかりでなく、その腐食量も多
いものであった。From the results shown in Table 2, the present invention A1 alloy plate materials 1 to 3
are NaC, which corresponds to the most severe operating environment conditions.
l In aqueous solution immersion tests, tap water immersion tests, and CASS tests, it shows excellent pitting corrosion resistance without increasing the amount of corrosion, whereas Comparative AA alloy sheet material 1, which does not contain Zn, has a large number of holes. In Comparative A1 Alloy Sheet Material 2, where corrosion occurs and the pitting corrosion is deep, and the Zn content is higher than the scope of this invention, not only a relatively large number of pitting corrosions are observed. , and the amount of corrosion was also large.
上述のように、この発明のに１合金板材は、すぐれた成
形加工性を有するばかりでなく、特に苛酷な腐食環境下
において、腐食量をほとんど増加させることなく、すぐ
れた耐孔食性を示すのである。As mentioned above, the Ni-1 alloy plate material of the present invention not only has excellent formability, but also exhibits excellent pitting corrosion resistance, with almost no increase in the amount of corrosion, especially in severe corrosive environments. be.
Claims (1)
上重量％）を有することを特徴とする耐孔食性にすぐれ
たＡ１合金板材。[Claims] I Mn: 1 to 1.5%, Zn: 0.2 to 1%, and the remainder is AA and unavoidable impurities (weight %). A1 alloy plate material with excellent pitting corrosion resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3112978A JPS594495B2 (en) | 1978-03-20 | 1978-03-20 | Al alloy plate material with excellent pitting corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3112978A JPS594495B2 (en) | 1978-03-20 | 1978-03-20 | Al alloy plate material with excellent pitting corrosion resistance |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17842783A Division JPS6045702B2 (en) | 1983-09-27 | 1983-09-27 | Al alloy plate material with excellent pitting corrosion resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54123513A JPS54123513A (en) | 1979-09-25 |
| JPS594495B2 true JPS594495B2 (en) | 1984-01-30 |
Family
ID=12322806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3112978A Expired JPS594495B2 (en) | 1978-03-20 | 1978-03-20 | Al alloy plate material with excellent pitting corrosion resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS594495B2 (en) |
-
1978
- 1978-03-20 JP JP3112978A patent/JPS594495B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54123513A (en) | 1979-09-25 |
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