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采用EDAX、SEM及FISCHER镀层测试仪等测试手段,对某型号金属-玻璃封接外壳电镀镍、金后盐雾摸底实验时的考核失效进行了分析,发现镀层厚度尤其是镀镍层的厚度对此类外壳盐雾实验结果影响较大。当镀镍层厚度大于3.5μm且镀金层厚度大于1.9μm时,此类外壳可以通过GJB548B-2005方法1009实验条件B的盐雾考核。此外,采用直流电源进行电镀获得的镀层均匀性较差,且厚度越厚,均匀性越差(不同区域的厚度差近三倍),通过引入正反脉冲电源可以有效提升镀层均匀性。
Using EDAX, SEM and FISCHER coating tester and other testing methods, the failure of a certain type of metal-glass sealed shell plating nickel, gold after the salt spray test was analyzed and found that the thickness of the coating, especially the thickness of the nickel layer Such shell salt spray test results have a greater impact. When the thickness of the nickel plating layer is greater than 3.5μm and the thickness of the gold plating layer is greater than 1.9μm, such a shell can pass the salt spray test of the GJB548B-2005 method 1009, Test Condition B. In addition, the coating obtained by DC power supply has poor uniformity and the thicker the coating, the worse the uniformity (almost three times the difference in thickness between different regions). The introduction of the positive and negative pulse power can effectively improve the coating uniformity.