Al-Zn-Mg系合金の溶接部の応力腐食割れに及ぼすCuの影響(<小特集>腐食防食小特集)

概要

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An investigation was made on the effect of small amount of Cu on the stress corrosion cracking in welds of Al-Zn-Mg series A7N01 alloys. The environments used were 3.5% NaCl solution, 36g/lCrO_3 + 30g/lK_2Cr_2O_7 + 3g/lNaCl solution and atmospheric exposure. The results obtained are as follows: The weld heat affected zone has higher susceptibility to stress corrosion cracking than the other position. Stress corrosion cracking fracture principally occurs in the weld heat affected zone about 0.5 〜 2 mm far from the weld bond. The addition of Cu increases strongly the resistance to stress corrosion cracking in aged alloys. Especially the addition of Cu increases the initiation time of stress corrosion cracking, but does not impractical point of view, it is necessary to add a small amount of Cu (less than 0.2%) to avoid stress corrosion cracking in aged welds of A7N01 alloy.
社団法人日本材料学会の論文
1988-01-15