Journal
CORROSION SCIENCE
Volume 191, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109725
Keywords
Magnesium alloys; Corrosion resistance; Conversion coatings; Pretreatment
Funding
- National Natural Science Foundation of China [51771050, 51531007]
- China Postdoctoral Science Foundation [2019M651128]
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The Alx(Mn,Fe)y phase, a common derivative of Fe-containing impurities, significantly deteriorates the protectiveness of phosphate conversion coatings (PCC) on magnesium alloys due to the micro-galvanic effect. A novel pretreatment method involving chemically depleting the noble Alx(Mn,Fe)y phase before PCC treatment has been proposed, leading to improved corrosion resistance attributed to the mitigation of micro-galvanic corrosion.
Alx(Mn,Fe)y phase, as a common derivative of Fe-containing impurities, significantly deteriorates the protectiveness of phosphate conversion coatings (PCC) on magnesium alloys due to the micro-galvanic effect. This work presents a novel pretreatment method, aiming at chemically depleting the noble Alx(Mn,Fe)y phase from Mg alloy surface before PCC treatment. The pretreatment bath contains both oxidant and complexing agent, with the pH value and concentration of different constituents being determined by thermodynamic calculation. The corrosion resistance of PCC being preceded by exploiting the novel pretreatment method was improved, which was attributed to the mitigation of micro-galvanic corrosion.
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