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Characteristics Evaluation of Conversion Coating of Acid Pickling AZ31 Magnesium Alloy by a Chromium-Free Phosphate-Permanganate Solution
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 Title & Authors
Characteristics Evaluation of Conversion Coating of Acid Pickling AZ31 Magnesium Alloy by a Chromium-Free Phosphate-Permanganate Solution
Kim, Myung-Hwan; Kwag, Sam-Tag; Moon, Myung-Jun;
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 Abstract
A chromium-free conversion coating for AZ31 magnesium alloy has been obtained by using a permanganatephosphate solution, which has been developed with acid pickling. Examination have been carried out on the conversion coatings for morphology, composition and corrosion resistance. The morphology of the conversion-coated layer was observed using optical microscope and SEM. It was shown that the conversion coatings are relatively uniform and continuous, with thickness 1.8 to 2.7 . The chemical composition of conversion coating was mainly consisted of Mg, O, P, K, Al and Mn by EDS analysis. It was found that the corrosion resistance of the AZ31 magnesium alloy has been improved by the permanganate-phosphate conversion treatment from electrochemical polarization.
 Keywords
AZ31;Magnesium alloy;Conversion coating;Chromium-free;Acid pickling;
 Language
Korean
 Cited by
1.
알카리성 인산-과망간산 용액을 이용한 AZ31 마그네슘 합금의 친환경 화성 처리 및 화성 피막의 특성 평가,김명환;이만식;곽삼탁;문명준;

한국표면공학회지, 2011. vol.44. 3, pp.82-88 crossref(new window)
1.
A Blade-Abrading Method for Surface Pretreatment of Mg Alloys, Journal of the Korean institute of surface engineering, 2015, 48, 5, 194  crossref(new windwow)
2.
Characteristics of Conversion Coating of AZ31 Magnesium Alloy Formed in Chromium-Free Cerium-Based Solution, Journal of the Korean institute of surface engineering, 2016, 49, 1, 62  crossref(new windwow)
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