ジルカロイ-2のCH_3OH/HCl溶液中における応力腐食割れとその電位依存性

概要

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The susceptibility to stress corrosion cracking (SCC) and its potential dependence of Zircaloy-2 were investigated. The SCC tests were conducted with CH_3OH solutions containing HCl under given potentials at room temperature. The critical potential for SCC in 0.4% HCl solution moved to the negative direction, and the susceptibility to SCC increased. The potential range for SCC corresponded withthe active region in the potentiostatic anodic polarization dagram, and the test specimen was attacked by uneven general corrosion when the potential was moved to the positive direction. The fracture mode of SCC differed from that of general corrosion, i.e. the transiton of integranular fracture to cleavage-like fracture was observed in the SCC potential region, whereas only integranular corrosion was found in the active region. It is, therefore, considered that cleavage-like fracture is caused by mechanical stresses associated with the absorption of hydrogen generated by an intergranular corrosion reaction. A model for cracking was prposed based on these experimental results.
社団法人日本材料学会の論文
1989-09-15