4J32镜头组件电化学方法消除杂散光的实验研究.doc

为消除光学系统镜头组件中杂散光以成像的影响，采用电化学方法对4J32合金进行处理，降低表面反射率，实现了消光处理。利用正交实验法研究了在重铬酸盐体系中主盐浓度、电压、电解液温度、时间等因素对镜头组件的消杂光性能的影响，并确定了最佳方法。结果表明，处理后零件尺寸改变极小，反射率降低较明显，所得到的4J32合金呈黑色、光亮美观，具有优良的附着力和消除杂散光能力。

Study of Stray light Suppressing Measure by electrochemistry for 4J32 alloys

In order to realize stray light suppressing for 4J32 alloy in fine optical system,the stray light suppressing coatings were prepared on 4J32 alloy from a conventional anodisation-plating bath containing Ce and dual salt additive.The bath formula and rational process parameters were investigated using a orthogonal test.By testing the influences of concentrations of K2Cr2O7,MnSO4and(NH4)2SO4 in electrolyte solution,galvanic voltage,operating temperature and anodizing time on the anodizing films of 4J32 alloys,the optimal process conditions were gained as follows:20 g/L K2Cr2O7,20 g/L MnSO4,20 g/L(NH4)2SO4,15 g/L Ce and dual salt additive,temperature of 25 ℃,last time of 20 min and voltage of 30 V.A black stray light suppressing film was obtained with the process.The results of reflection testing,thick testing and shock testing show that 4J32 stray light suppressing coating has a low-reflecting ratio(1.5%),a few dimension change(<0.8 μm) and good adhesion to substrate,and it is suitable to suppress the stray light in fine optic system.