Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Galvanic Corrosion of Zn/Steel Couple in Aqueous MgCl2

  • Tada, E. (Dept. Mater. Sci. & Eng., Tokyo Institute of Technology) ;
  • Katakami, S. (Dept. Mater. Sci. & Eng., Tokyo Institute of Technology) ;
  • Nishikata, A. (Dept. Mater. Sci. & Eng., Tokyo Institute of Technology)
  • Received : 2017.06.14
  • Accepted : 2017.08.17
  • Published : 2017.08.31
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Abstract

Galvanic corrosion tests of Zn/steel couples were conducted in 1 M NaCl and $1M\;MgCl_2$ 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 $1M\;MgCl_2$ 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 $1M\;MgCl_2$ solution indicates that the sacrificial dissolution rate of Zn in $1M\;MgCl_2$ 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 $1M\;MgCl_2$ by the occurrence of hydrogen evolution reaction.

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References

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