Solubility of Hydrogen in Liquid Copper and Certain Copper Alloys Measured by Sieverts’ Method

Abstract

The solubility of hydrogen in liquid pure copper and binary copper alloys have been measured by Sieverts’ method under an atmospheric pressure of hydrogen. Among the alloying elements, nickel, cobalt and iron increase the solubility of hydrogen in the alloys, while tin and silicon decrease it. The results obtained are summarized as follows:
(1) Solubility of hydrogen in liquid pure copper in the temperature range of 1096°∼1288°C.
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(2) Interaction parameter e_H^(j) in liquid copper alloys:
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(3) There is a regular periodic relation between the interaction parameter, ε_H^(j), and atomic number of the alloying element.
(4) There is a correlation between the interaction parameter, ε_H^(j), and effective free electron concentration of the alloying element. Therefore, it seems that the free electron of the alloying element mainly influences the hydrogen solubility in liquid copper, while other factors such as the coulombic interaction between proton and the solute atoms and the strain caused by the difference in the size factor of solute atoms slightly influence the solubility.
(5) A linear relation between the interaction parameters, ε_H^(j), in liquid copper and liquid iron is observed.