Formation and properties of stannate conversion coatings on AZ61 magnesium alloys
Resource
Corrosion Science 48 (1): 93-109
Journal
Corrosion Science
Journal Volume
48
Journal Issue
1
Pages
93-109
Date Issued
2006
Date
2006
Author(s)
Lin, C.S.
Lin, H.C.
Lin, K.M.
Lai, W.C.
Abstract
The effects of solution composition and temperature on the microstructure and corrosion resistance of stannate conversion coatings on AZ61 magnesium alloys were investigated. The conversion coating consisted of a porous layer as under layer intimately contacted with the magnesium plate and a hemispherical particle layer as major overlay formed right on top of the porous layer. During the coalescence of the hemispherical particles to form a complete coating on the magnesium alloy, some sites of discontinuity inevitably left and determined the corrosion resistance of the coating evaluated using a salt spray test. Increasing bath stannate ion concentration and lowering bath pH increased the population density of the hemispherical particles whose size was accordingly reduced. The corrosion resistance of the conversion coating was improved with finer particles, which were preferably formed at less alkaline solution with higher stannate ion contents. Furthermore, the conditions favoring the formation of finer particles also reduced the immersion time necessary for producing the conversion coating with optimal corrosion resistance. © 2005 Elsevier Ltd. All rights reserved.
Subjects
AZ61 magnesium alloys; Corrosion resistance; Salt spray test; Stannate conversion coating
Other Subjects
Corrosion resistance; Magnesium alloys; Microstructure; pH effects; AZ61 magnesium alloy; Salt spray test; Stannate conversion coating; Coatings; coating; corrosion resistance; magnesium alloy; microstructure
Type
journal article
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