Journal
CORROSION SCIENCE
Volume 52, Issue 12, Pages 3907-3916Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2010.08.007
Keywords
Steel; Zinc; XRD; Polarization; EIS; Acid corrosion
Funding
- China Steel Corporation, Taiwan
- National Science Council of Taiwan [982221E002056MY3]
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The effect of Mg2+ in the phosphate solution on the microstructural evolution and corrosion resistance of the coating on hot-dip galvanized steel has been explored. Surface morphology observations reveal that increasing the solution Mg2+ concentration increases the population density and refines the grain size of the phosphate grains. In the presence of Mg2+, the phosphate coating is composed of mixed Zn phosphate hydrate and (Zn, Mg) phosphate hydrate. Furthermore, elevating Mg2+ in the solution reduces the porosity of the phosphate coating. As a result, the corrosion resistance of the phosphate coating is improved. (C) 2010 Elsevier Ltd. All rights reserved.
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