Abstract
We study the effect of preliminary hydrogenation of carbon and low-alloy steels on their electrochemical behavior in a hydrogen galvanic couple “hydrogenated-nonhydrogenated steel.” The hydrogenation conditions being equal, the current of a hydrogen galvanic couple is determined not by its electromotive force but by the degree of polarization of the electrodes, which depends on the ratio between their areas. The polarization relations show that the electrochemical processes in a hydrogen galvanic couple obey the laws of electrochemical kinetics and have an activation nature. The current of a hydrogen galvanic couple is proportional to the concentration of absorbed hydrogen in steels, and, correspondingly, this dependence can serve as a basis of a new method for the nondestructive testing of hydrogen content in steel. As the hydrogen content in steels increases, their electrochemical properties approach the properties of a juvenile surface: the electrolytic potential becomes more negative, the polarization decreases, and the rate of anodic reactions grows sharply.
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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 41, No. 2, pp. 76–82, March–April, 2005.
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Zakharchuk, V.H., Tsyrul'nyk, O.T. & Nykyforchyn, H.M. Electrochemical Properties of Steels in a Model Hydrogen Galvanic Couple. Mater Sci 41, 223–229 (2005). https://doi.org/10.1007/s11003-005-0154-2
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DOI: https://doi.org/10.1007/s11003-005-0154-2