Abstract
Plasma electrolytic fluorination (PEF) was performed on AZ31 Mg alloy in the ethylene glycol (EG) electrolytes containing varying quantities of H3PO4. Effects of the H3PO4 addition on the microstructure, growth behaviour and corrosion resistance of the PEF coatings were analyzed. Results revealed that after the addition of H3PO4, the plasma discharges became weaker and the crystallinity of the PEF coating was detected to decrease with the H3PO4 content. As the H3PO4 content reached 20 g/L, the PEF coating was completely transformed into an amorphous state. Beside, adding H3PO4 into the EG electrolytes increased the growth rates of the PEF coatings, and changed the growth mechanism of the PEF coatings from inward growth to mixed growth dominated by outward growth. The influence of the H3PO4 addition on the corrosion resistance of PEF coating varied with the H3PO4 content in EG electrolytes. When the H3PO4 content was 10 g/L, the PEF coating had the best corrosion resistance.
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