Film forming treatment agent and film forming method for composite chemical conversion film for magnesium alloy.

摘要

A film forming treatment agent and a film forming method for a composite chemical conversion film for magnesium alloy, and a composite chemical conversion film are provided. The components of the film forming treatment agent for a composite chemical treatment film for magnesium alloy are composed of an aqueous solution and a suspension of reduced graphene oxide flakes for the aqueous solution. The aqueous solution is composed of 0.1 mol / L to 2.5 mol / L strontium ions and 0.06 mol / L to 1.5 mol / L phosphate ions, and the aqueous solution has a pH value of 1.5 to 4.5. The concentration of the reduced graphene oxide varies between 0.1 mg / L to 5 mg / L. The film forming process method for a composite chemical treatment film for magnesium alloy includes the following steps 1) pre-treating the surface of the magnesium alloy matrix; 2) immersing the magnesium alloy matrix in the film forming treatment agent; 3) It consists of taking out magnesium alloy pieces and drying them in air. The composite chemical conversion treatment film for magnesium alloy is formed by immersing a magnesium alloy matrix in the film forming treatment agent. The composite chemical conversion film for magnesium alloy in 3.5 wt% sodium chloride solution has excellent corrosion resistance.