In order to realize stray light suppressing for 4J32 alloy in Optical System

stray light suppressing coatings were prepared on 4J32 alloy from a conventional anoditation-plating bath containing Ce and duable salt additive. The bath formula and rational process parameters were investigated making use of orthogonal test. By testing the influences such as concentration of K2Cr2O7

MnSO4

(NH4)2SO4

in electrolyte solution

galvanic voltage

operating temperature

anodizing time

etc. on the anodizing films of TC4 alloys

the optimal process condition were gained as follows: 20g/L K2Cr2O7

20g/L MnSO4

20g/L (NH4)2SO4

15g/L Ce and duable salt additive temperature of 25℃、last time of 20min、voltage of 30V. A black stray light suppressing film were gained by the process. The results of reflection testing

thick testing and shock testing showed that 4J32 stray light suppressing coating has low-reflecting ratio( reflecting ratio 1.5%±0.5%)

few dimension change (<0.8μm) and good adhesion to substrate. The film are suitable to suppress the stray light in optic system.