The study on performances of environment-friendly colorless chemical conversion coatings on aluminum alloy

Abstract With the increasingly high requirements on appearance of electronic equipment and environmental protection, conventional chromate chemical conversion coatings aluminum alloys gradually showed some shortcomings, such as color difference in harm to human health environment process. In this paper, three kinds environment-friendly colorless (LANTH-613, ALTRCHR-250, YMT-631) were prepared by using 5056 6061 alloy samples visually observing coatings. Then, performances coatings, morphology, corrosion resistance, electrical contact paint adhesion, characterized scanning electron microscope, salt spray test, resistance cross-cut respectively. As a result, we proposed YMT-631 coating could be used alone long-term protective for parts that require natural equipment, which adaptability harsh significantly improved.