Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Influence of Dissolved Oxygen on the Stress Corrosion Behavior of 18Cr-8Ni Austenitic Stainless Steel
Ryohei TANAKAKyuya NAGASAKITingkwei Hsu
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1970 Volume 56 Issue 2 Pages 342-350

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Abstract

In order to study the behavior of oxygen dissolved in corrosives which has been reported to influence the stress corrosion cracking of austenitic stainless steels, the specimens of the steel were stressed and exposed to 42% MgCl2 solution or 40% FeCl2 solution under nitrogen or normal atmosphere, and the change in ductility and hardness during corrosion, and fracture time were measured.
The results obtained are summarized as follows:
(1) In 42% MgCl2 solution without dissolved oxygen, the stress corrosion cracking occurred both in case of whole immersion specimen or half immersion specimen.
(2) It was concluded that the dissolved oxygen is necessary for pitting to occur in high temperature sodium chloride solution, but, after the initial pit forms, the crack propargation may depend on hydrogen embrittlement which is resulted from the phenomenon that low pH FeCl, is filled in the pit by electrochemical reaction.
(3) The stress corrosion mechanism seemed to be illustrated from the standpoint of crevice corrosion mechanism, and consequently it was concluded that not oxygen but hydrogen plays an important role in stress corrosion cracking processes.

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© The Iron and Steel Institute of Japan
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