An on-line monitoring system for hydrogen distribution metallic wall caused by hydrogen permeation

Abstract

Abstract: Based on the electrochemical permeation technique and the patent by Du, an intelligent electrochemical measurement system for determination of the hydrogen distribution in the wall of hydrogenation reactor has been developed and tested. It consists of a PC computer, a single chip unit, an I/V converter and an electrochemical hydrogen probe. The construction of the electrochemical hydrogen probe is described and the features of the measured system are given. The diffusion coefficient of 2.25Cr1Mo steel determined with present system was in good agreement with the value in the literature. Experimental results of hydrogen concentration in a wall of hydrogen charged testing autoclave made of AISI 321 stainless steel are presented. The present system can intelligently display hydrogen amount-of-substance concentration and mass fraction concentration, hydrogen concentration distribution curves in steels, permeation current density curve. An intelligent detection technique can be provided for predicting the susceptibility to hydrogen-induced cracks owing to hydrogen permeation in the wall of hydrogenation reactor in the field.

Key words:

Gang YU, Xueyuan ZHANG, Yuanlong DU. An on-line monitoring system for hydrogen distribution metallic wall caused by hydrogen permeation[J]. J Mater Sci Technol, 2001, 17(03): 346-350.

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An on-line monitoring system for hydrogen distribution metallic wall caused by hydrogen permeation

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