Research on hydrogen embrittlement by electrochemical hydrogen permeation technique

Abstract

Research on hydrogen embrittlement by electrochemical hydrogen permeation technique is reviewed in this paper. Diffusion coefficient of hydrogen (D) and hydrogen permeation rate (J) can be more easily determined by electrochemical hydrogen permeation technique than other hydrogen measurement methods. Threshold hydrogen content for hydrogen embrittlement can be determined and hydrogen embrittlement mechanism is discussed by focusing effects of metallurgical factors on apparent D. Effects of environmental factors on J have been investigated and hydrogen entering mechanism can be discussed by transition of J. The electrochemical hydrogen permeation technique can be used as a monitoring system in plants. It can be also applied to “in-situ measurement” by combining with other tests of fracture mechanics, ultrasonic wave C-scanning and so on. It will have a potential of new experimental variation to research on hydrogen embrittlement.