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Preparation of Composite Molybdate/Phosphate Conversion Coating on Mg Alloys

Yali Liu

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Abstract

A molybodate/phosphate conversion coating on magnesium alloy is investigated,and several factors affecting the conversion coating are analysed.The results show that molybdate/phosphate conversion coating has the lowest corrosion current and the best corrosion resistance when the pH of molybdate-phosphate conversion bath is 5 and n(MoO~(2-)_4)/n(H_2PO~-_4) is 1/2.The treated magnesium alloy has a uniform alveolate-crystallized microstructure.When the molybdate-phosphate conversion bath contains both ions Mn~(2+) and Ca~(2+),the conversion coating has maximal polarization impedance.

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What this paper is about

A molybodate/phosphate conversion coating on magnesium alloy is investigated,and several factors affecting the conversion coating are analysed.The results show that molybdate/phosphate conversion coating has the lowest corrosion current and the best corrosion resistance when the pH of molybdate-phosphate conversion bath is 5 and n(MoO~(2-)_4)/n(H_2PO~-_4) is 1/2.The treated magnesium alloy has a uniform alveolate-crystallized microstructure.When the molybdate-phosphate conversion bath contains both ions Mn~(2+) and Ca~(2+),the conversion coating has maximal polarization impedance.

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Available abstract

A molybodate/phosphate conversion coating on magnesium alloy is investigated,and several factors affecting the conversion coating are analysed.The results show that molybdate/phosphate conversion coating has the lowest corrosion current and the best corrosion resistance when the pH of molybdate-phosphate conversion bath is 5 and n(MoO~(2-)_4)/n(H_2PO~-_4) is 1/2.The treated magnesium alloy has a uniform alveolate-crystallized microstructure.When the molybdate-phosphate conversion bath contains both ions Mn~(2+) and Ca~(2+),the conversion coating has maximal polarization impedance.

Key concepts: Molybdate, Conversion coating, Materials science, Phosphate, Coating, Corrosion, Magnesium, Microstructure

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