The Composition of the Rare Earth Based Conversion Coating Formed on AZ91D Magnesium Alloy
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As structural materials, magnesium (Mg) alloys have been widely used in the fields of aviation, automobiles,optical instruments, and electronic products. There are few studies on the effect of coating conditions onthe compositional variation during the formation process of the conversion coatings. Rare-earth based conversioncoating on AZ91 magnesium alloy was prepared in ceric sulfate and hydrogen peroxide contained solution. The element composition and valence as well as their distribution in the coating were analyzed with energydispersive X-ray spectroscopy (EDS), Electron probe micro-analyzer (EPMA), X-ray photoelectron spectroscopy(XPS). The effect of treating process on the element composition were also studied. It was found thatthe conversion coating surface consists of Mg, Al, O, Ce, and the weight content of Ce in the coatingwas affected by the treating solution concentration and immersion time; the Ce element was distributedin the coating non-uniformly and existed in the form of Ce+3 and Ce+4, while the O element existed inthe form of OH-, O2-, H2O. Based on microscopic analysis results, the electrochemical deposition mechanismon the micro-anode and micro-cathode in the process of the coating growth was suggested.
Abstract
As structural materials, magnesium (Mg) alloys have been widely used in the fields of aviation, automobiles,optical instruments, and electronic products. There are few studies on the effect of coating conditions onthe compositional variation during the formation process of the conversion coatings. Rare-earth based conversioncoating on AZ91 magnesium alloy was prepared in ceric sulfate and hydrogen peroxide contained solution. The element composition and valence as well as their distribution in the coating were analyzed with energydispersive X-ray spectroscopy (EDS), Electron probe micro-analyzer (EPMA), X-ray photoelectron spectroscopy(XPS). The effect of treating process on the element composition were also studied. It was found thatthe conversion coating surface consists of Mg, Al, O, Ce, and the weight content of Ce in the coatingwas affected by the treating solution concentration and immersion time; the Ce element was distributedin the coating non-uniformly and existed in the form of Ce+3 and Ce+4, while the O element existed inthe form of OH-, O2-, H2O. Based on microscopic analysis results, the electrochemical deposition mechanismon the micro-anode and micro-cathode in the process of the coating growth was suggested.
참고문헌 (12)
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