オーステナイトステンレス鋼の分極下での水素脆化挙動と応力腐食割れの関連性について

概要

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In order to study the behavior of hydrogen embrittlement under anodic and cathodic polarization of austenitic stainless steels, were measured the change in ductility and amount of adsorbed hydrogen in the 18Cr-8Ni and 25Cr-20Ni stainless steels in H_2SO_4, HCl, NaCl and MgCl_2 solutions. The main results obtained are as follows : (1) Hydrogen absorption and embrittlement occurs in chloride solution under anodic polarization but not in H_2SO_4 solution. (2) This hydrogen adsorption was closely connected with the operation of local corrosion cells associated with pits on the surface of the steel. (3) It is significant that the pitting and the associated hydrogen adsorption in these steels play an important role for stress corrosion cracking. Therefore impressed anodic current can reduce the stress corrosion cracking time.
社団法人日本鉄鋼協会の論文
1970-05-01