Journal
CORROSION SCIENCE
Volume 150, Issue -, Pages 279-295Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.01.046
Keywords
Magnesium; XRD; polarization curves; SEM; interfaces; oxide coatings
Funding
- National Natural Science Foundation of China [51531007, 51771050, U1737102]
- Young Elite Scientists Sponsorship Program by CAST [2017QNRC001]
- National program for the Young Top-notch Professionals
- Fundamental Research Funds for the Central Universities [N170205002, N170203006]
- Program of Hundred Talents of Chinese Academy of Sciences
- Key Laboratory of Superlight Material and Surface Technology (Harbin Engineering University), Ministry of Education
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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.
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