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        Galvanic Corrosion of Zn/Steel Couple in Aqueous MgCl₂

        ( E. Tada ),( S. Katakami ),( A. Nishikata ) 한국부식방식학회(구 한국부식학회) 2017 Corrosion Science and Technology Vol.16 No.4

        Galvanic corrosion tests of Zn/steel couples were conducted in 1 M NaCl and 1 M MgCl₂ solutions to investigate the impact of magnesium ion on corrosion behavior of the couples. Two types of Zn/steel couples were used for measurements of open circuit potential (OCP) and galvanic current. From the results of OCP transient of Zn/steel couples, the corrosion potential in 1 M MgCl₂ was a more positive value than that in 1 M NaCl during the sacrificial dissolution of Zn. However, earlier increase of OCP of the couples in 1 M MgCl₂ solution indicates that the sacrificial dissolution rate of Zn in 1 M MgCl₂ was enhanced more than that in 1 M NaCl, agreeing with the results on transients of galvanic current. This result is due to that cathodic reaction on the steel surface of the Zn/steel couple was enhanced in 1 M MgCl₂ by the occurrence of hydrogen evolution reaction.

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