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Assessment of hydrogen permeation on steels by a simplified device using two electrode configuration based on passive interfaces
Author(s) -
de Freitas D. S.,
Ponciano J. A. C.,
Jambo H. C. M.
Publication year - 2001
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/1521-4176(200110)52:10<760::aid-maco760>3.0.co;2-f
Subject(s) - hydrogen , electrode , chemistry , galvanic cell , analytical chemistry (journal) , chromatography , organic chemistry
Based on the potential decay observed in the anodic side of a Devanathan cell, it was possible to develop a hydrogen permeation probe based on two‐electrode configuration using a pair of passive steel interfaces. The influence of the hydrogenating environment and the TEHP response could be observed and it was in a good agreement with ones found in literature. However this technique showed some limitations. It was interesting to point out that this probe works as a galvanic couple, therefore its open potential overcomes fluctuations and the current response can be affected by the simultaneous reactions that take place during the hydrogen oxidation, such as oxygen and passive film reduction. The relationship between the measurements performed with the TEHP and the continuous inspection using B‐scan was also investigated. This showed a good correlation between the hydrogen flux through the metallic membrane and ist effect on the internal damage of a C‐Mn steel. Despite the limitations presented by the Two Electrode Hydrogen Probe, the simplicity of its concept and the good correlation found with the ultrasonic technique, justify a further investigation in the field of the hydrogen permeation probes.