Effect of additives on the properties of phosphate conversion coating on electrogalvanized steel sheet |
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| Affiliation: | 1. CSIR, National Metallurgical Laboratory, Madras Centre, CSIR Complex, Chennai 600 113, India;2. Department of Analytical Chemistry, School of Chemical Sciences, University of Madras, Maraimalai Campus, Chennai 600 025, India;3. Department of Dental Biomaterials and Institute of Biodegradable Materials, Institute of Oral Bioscience and BK21 Plus Project, School of Dentistry, Chonbuk National University, Jeonju 561-756, Republic of Korea |
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| Abstract: | 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. |
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| Keywords: | A Zinc B EIS B XPS C Passive films |
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