Electrochemical Studies on Cause of Hydrogen-embrittlement by Zn-cyanide Plating:Studies on Hydrogen-embrittlement of Steel Electrolytically Plated by Zn-cyanide Process (Part 2)
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Hydrogen-embrittlement caused by Zn-cyanide plating process was stronger than that by the acidic process in the same current efficiency. Therefore, the embrittlement by the former process seemed to be caused by other factors than the amount of hydrogen discharged. At first, electrolytic con-ditions in the process of plating were studied for hydrogen or zinc polarization by potentiostatic method in the eight baths reported in the previous paper.The results obtained were as follows:1) The degree of brittleness of the specimens corresponded well with that of the hydrogen polarization before Zn deposition. Then, the cause of embrittlement was considered to be the action of hydrogen discharged on the naked iron cathode of low hydrogen overvoltage.2) As the results of equilibrium potential measurements and activity of OH-, it was concluded that most of Zn from so-called Zn cyanide bath was deposited from zincate solution.
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