Journal
CORROSION SCIENCE
Volume 83, Issue -, Pages 137-146Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2014.02.002
Keywords
Zinc; EIS; XPS; Passive films
Funding
- National Science Council of the Republic of China [96-2628-E-002-016-MY3, 102-3113-P-002-025]
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Ni2+ and Mn2+ ions have been added separately to the phosphate solution to minimize the porosity of the phosphate conversion coating on electrogalvanized steels. Results showed that the Ni2+ or Mn2+ in the. solution reduced the grain size and porosity of the phosphate coating; thereby, the corrosion resistance was enhanced. However, Ni2+ and Mn2+ played a different role in the coating formation. Ni2+ in the solution was reduced by Zn to form Ni, which enhanced the dissolution of Zn to promote the nucleation of hopeite grains. Mn2+ in the solution facilitated the nucleation by increasing the impingement of reacting species. (c) 2014 Elsevier Ltd. All rights reserved.
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