AN ELECTROCHEMICAL METHOD FOR THE STUDY OF DIFFUSION OF HYDROGEN IN CARBON STEEL AT ELEVATED TEMPERATURES

J Chin Soc Corr Pro

1989, Vol. 9

Issue (4): 322-326 DOI:

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AN ELECTROCHEMICAL METHOD FOR THE STUDY OF DIFFUSION OF HYDROGEN IN CARBON STEEL AT ELEVATED TEMPERATURES

Wei Baoming Zhang Zhongxing (Nanjing Institute of Chemical Technology)

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Abstract An electrochemical set-up was devised to measure the diffusion and permeation rates of hydrogen in cardon steel at elevated temperatures on the principle of Devanathan cell. The optimum parameters for the set-up were obtained as follows: The electrolyte in measuring room was 0.1N NaOH solution; The reference and appendix electrodes were made with pure nickel; The thickness of palladium plating on the measuring side was 0.2μm; The anodic polarized potential to oxidize permeated hydrogen atoms was +300mV (relative to the nickel reference electrode). The diffusion coefficients and diffusion rates of hydrogen in carbon steel at temperatures 100～200℃ were measured with the above mentioned set-up. The activation energy ot diffusion by means of diffusion coefficients was 8.61kJ/mol, The mechanism of H~+ reduction on carbon steel was discussed. The results showed that the mechanism was "fast charging,slow coupling electrochemically".

Received: 25 August 1989

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Wei Baoming Zhang Zhongxing (Nanjing Institute of Chemical Technology). AN ELECTROCHEMICAL METHOD FOR THE STUDY OF DIFFUSION OF HYDROGEN IN CARBON STEEL AT ELEVATED TEMPERATURES. J Chin Soc Corr Pro, 1989, 9(4): 322-326.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1989/V9/I4/322

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