Abstract: In view of the mechanical product under the conditions of corrosion, especially in the special easy corrosion situation, this paper studies the surface roughness of Ra0.2 state non quenched and tempered 45 steel treated with QPQ combined anti-rust oil after corrosion resistance. Use of neutral salt spray accelerated corrosion with optical microscope, and X-ray diffraction analysis shows that after QPQ treatment corrosion resistance is enhanced. The main reason is that permeability layer formed in the oxide film and compound layer. Rust-proof oil improve product corrosion resistant ability and the main reason is that the rust-proof medium oil soluble corrosion inhibitor. Dealing with QPQ treatment and rust-proof oil would greatly improve the corrosion resistance of the specimen, and the longest time is up to 432 hours of salt spray resistance, which can be used widely in industrial anti-corrosion.