2011•Cailiao gongchengRequires access
Influence of Phytic Acid Concentration on Corrosion Resistance of Phytic Acid Conversion Coating on AZ31B Magnesium Alloy
Yong Zou
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Abstract
The phytic acid conversion coatings on AZ31B magnesium alloy were formed in different phytic acid concentrations and the corrosion resistance of the conversion samples was studied by hydrogen evolution method and Tafel.The morphology,composition and functional groups were investigated by SEM,EDS and FTIR,respectively.The results indicate that the concentration of phytic acid has obvious influence on the corrosion resistance of the conversion samples,the conversion sample formed under C=4.0g·L-1 has the best corrosion resistance,the current density decreases about two orders than that of the untreated sample.The main elements of the coating are Mg,Al,Zn,O and P,the functional groups are PO3-4,HPO2-4 and OH-.The conversion coating also has few cracks,and the thin coating is formed on the crack.