5083合金の応力腐食割れに及ぼす環境因子の影響
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Stress corrosion cracking and intergranular corrosion of aluminum alloy was tested in NaCl and NaCl+H2O2 solution under freely corroding and together with potentiostatic condition. The potentiostatic test showed that critical potential of stress corrosion cracking, ESCC, and of intergranular corrosion. EIGC, shifted in the less noble direction with increasing the concentration of chloride. ESCC was noted as less noble than or nearly equal to EIGC. In acid solution (pH3) stress corrosion cracking occurred under less noble potential than in neutral (pH6) or alkaline (pH9) solution. In the natural immersion tests, stress corrosion cracking was only observed when the noblest value of natural potential during test, En, exceeded the critical value ESCC. Potentiostatic test at -700mV vs. SCE in solution containing 0.18g/l of chloride ion at pH6 or 9 was recommended for stress corrosion cracking test because of easier detection of cracks, beter reproducibility of results and shorter time for the test in comparison with the conventional natural immersion tests. The stress corrosion cracking of 5083 alloy in chloride solution proceeds by active pass corrosion.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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