Al-Mg合金の応力腐食割れに及ぼす粒界折出物の影響
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Stress corrosion cracking of Al-Mg alloys, particularly the relation between the size of the grain boundary precipitates and the time to failure was investigated by the tensile test, electron micrographic observations and electrochemical methods. Stress corrosion of specimens containing 7 to 9wt%Mg were tested in 1 mol NaCl+0.9%H2O2 solution, after aged at a temperature below 200°C for less than 100min. The results obtained are summarized as follows: (1) In the electron micrographs of the specimen aged at a temperature below 200°C for less than 100min., only grain boundary precipitates were observed. As aging proceeded, their growth was observed.(2) For an Al-9.0wt%Mg alloy aged at 200°C less than 100min., the larger the grain boundary precipitates the shorter was the time to the stress corrosion failure.(3) The corrosion potentials of Al-Mg alloys became less-noble with the growth of the grain boundary precipitates, e. g. the corrosion potential of an Al-9.0wt%Mg alloy quenched from 430°C into iced water was -0.55V (vs. N. H. E.) and that of a specimen aged at 200°C for 100min. was-0.76V.(4) The corrosion potential of the stressed speciman of an Al-9.0wt%Mg alloy was independent of the size of the grain boundary precipitates. Its value was between -0.51V and -0.54V (vs. N. H. E.).(5) The anodic and cathodic current densities of an Al-7.0wt%Mg alloy aged at 200°C for 10min. increased in proportion to the applied stress at a constant over voltage.
- 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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