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The phosphate coating for Mg alloy was performed in the unagitated solutions containing 1 g・dm-3 of Mg, Ca, Sr and Ba as alkaliearth metal and 50 g・dm-3 of H3PO4 of pH 3 and 40°C for 3 min, and the structure and formation behavior of the phosphate films were investigated. The Xray diffraction patterns of phosphate films broadened regardless of the kinds of alkaliearth metal, which was a characteristic of an amorphous structure. XPS analysis revealed that the valence of P in the phosphate films was pentavalent. The pH in the vicinity of the Mg alloy during the phosphate coating, as measured using an Sb microelectrode, was approximately 10.4, 11.4, 10.7, 12.0 in the solutions containing Mg, Ca, Sr and Ba, respectively, which shows that the phosphoric acid dissociates to the third stage during the phosphate coating and the phosphate films composed of M3(PO4)2 containing alkaliearth metal (M) are formed. The phosphate coating were successively performed in the two kinds of solutions containing different alkaliearth metals and the cross section was analyzed, as a result, it was suggested that the new phosphate films were formed at the interface between Mg alloy substrate and phosphate films and the previously formed phosphate films were boosted up in films. [doi:10.2320/jinstmet.J2016039]

Formation Behavior of Phosphoric Acid-Based Chemical Conversion Coating Containing Alkaline Earth Metals on Magnesium Alloy