Double-layered manganese phosphate conversion coating on magnesium alloy AZ91D: Insights into coating formation, growth and corrosion resistance

Chen, X, Zhou, X, Abbott, T, Easton, M and Birbilis, N 2013, 'Double-layered manganese phosphate conversion coating on magnesium alloy AZ91D: Insights into coating formation, growth and corrosion resistance', Surface and Coatings Technology, vol. 217, pp. 147-155.


Document type: Journal Article
Collection: Journal Articles

Title Double-layered manganese phosphate conversion coating on magnesium alloy AZ91D: Insights into coating formation, growth and corrosion resistance
Author(s) Chen, X
Zhou, X
Abbott, T
Easton, M
Birbilis, N
Year 2013
Journal name Surface and Coatings Technology
Volume number 217
Start page 147
End page 155
Total pages 9
Publisher Elsevier
Abstract A double-layered conversion coating system, consisting of magnesium hydroxide-magnesium/manganese phosphate, was applied to magnesium alloy AZ91D using an acidic manganese nitrate and ammonium dihydrogen phosphate solution. The coating structure, composition and morphology were characterised by SEM, EDX, XRD and XPS. A coating formation mechanism is proposed, and the effect of operating parameters, i.e. pH and temperature, on coating formation was systematically investigated, with optimised conditions able to produce coatings of high corrosion resistance. Corrosion resistance of the coating was evaluated by electrochemical and salt spray testing. The double-layered coating system develops in three stages: initial substrate dissolution, formation of a dense magnesium hydroxide layer, and then co-deposition of magnesium and manganese phosphate film.
Subject Materials Engineering not elsewhere classified
Keyword(s) Conversion coating
corrosion resistance
EIS
Magnesium alloy AZ91D
Manganese phosphate
Polarisat
DOI - identifier 10.1016/j.surfcoat.2012.12.005
Copyright notice © 2012 Elsevier B.V. All rights reserved.
ISSN 0257-8972
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