Ratio of total acidity to pH value of coating bath: A new strategy towards phosphate conversion coatings with optimized corrosion resistance for magnesium alloys

Zhang, C, Liao, S, Yu, B, Lu, X, Chen, X, Zhang, T and Wang, F 2019, 'Ratio of total acidity to pH value of coating bath: A new strategy towards phosphate conversion coatings with optimized corrosion resistance for magnesium alloys', Corrosion Science, vol. 150, pp. 279-295.


Document type: Journal Article
Collection: Journal Articles

Title Ratio of total acidity to pH value of coating bath: A new strategy towards phosphate conversion coatings with optimized corrosion resistance for magnesium alloys
Author(s) Zhang, C
Liao, S
Yu, B
Lu, X
Chen, X
Zhang, T
Wang, F
Year 2019
Journal name Corrosion Science
Volume number 150
Start page 279
End page 295
Total pages 17
Publisher Pergamon Press
Abstract In this work, with the aid of thermodynamic equilibrium calculations, a crucial contributor, i.e. total acidity/pH value (TA/pH), was proposed for the first time to guide the design of the chemical formulation of metal-phosphate-based conversion coatings having excellent corrosion resistance for Mg alloys. The present study and published works were compared to validate the proposed theory and correlation between the TA/pH and corrosion resistance of the resulting coatings. A significant contribution of this work was the elucidation of the kinetic role of the buffering nature of chemical bath in regulating the formation of corrosion resistant phosphate conversion coatings.
Subject Metals and Alloy Materials
Keyword(s) A: Magnesium
B: XRD
C: interfaces
oxide coatings
polarization curves
SEM
DOI - identifier 10.1016/j.corsci.2019.01.046
Copyright notice © 2019 Elsevier
ISSN 0010-938X
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