The possibility of forming a sacrificial anode coating for Mg

Guang Ling Song, Nancy J. Dudney, Juchuan Li, Robert L. Sacci, Jeffery K. Thomson

Research output: Contribution to journalShort surveypeer-review

33 Scopus citations

Abstract

Mg is the most active engineering metal, and is often used as a sacrificial anode/coating to protect other engineering metals from corrosion attack. So far no sacrificial anode coating has been developed or considered for Mg. This study explores the possibility of forming a sacrificial coating for Mg. A lithiated carbon coating and a metaphosphated coating are applied on the Mg surface, respectively, and their open-circuit-potentials are measured in saturated Mg(OH)2 solution. They exhibit more negative potentials than bare Mg. SEM reveals that the metaphosphated coating offers more effective and uniform protection for Mg than the lithiated carbon coating. These preliminary results indicate that development of a sacrificial anode coating for Mg is indeed possible.

Original languageEnglish
Pages (from-to)11-14
Number of pages4
JournalCorrosion Science
Volume87
DOIs
StatePublished - Oct 2014

Funding

The Research was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory . The graphite materials were kindly supplied by Pred Materials. The authors would like to thank GM R&D director, Dr. M.W.Verbrugge, for his support and beneficial discussion in this project. Also, T. Lowe’s help in SEM experiment is highly appreciated.

Keywords

  • A. Magnesium
  • B. SEM
  • C. Cathodic protection

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