Patent ID: 8337689

Claim:
A composition for plasma electrolytic oxidation (PEO) treatment of magnesium alloy products, which contains a sodium hydroxide (NaOH) solution as a main component, the composition comprising, based on the weight of sodium hydroxide contained in the sodium hydroxide solution: 1-20 wt % of sodium fluoride (NaF); 1-15 wt % of trisodium phosphate (Na 3 PO 4 ); 1-10 wt % of sodium pyrophosphate (Na 4 P 2 O 7 ); 1-20 wt % of aluminum hydroxide (Al(OH) 3 ); 1-20 wt % of sodium fluorosilicate (Na 2 SiF 6 ); 1-10 wt % of potassium hydroxide (KOH); 1-15 wt % of potassium acetate (C 2 H 3 O 2 K); and 1-10 wt % of rare earth metal powder.