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前言硝酸除金铂以外,能与所有金属、非金属及有机物起化学反应。50%硝酸在室温下用来滴定铜与铜含金钝化膜的抗腐蚀性能方法,是各部门早已使用的一种快速检定方法。它是根据滴在零件表面后至发出气泡的时间来检验钝化膜的抗腐蚀情况。检验标准为超过6秒合格。此法也可以用于测定浸“TX”防银变色剂银镀层的抗变色性能,它的测定结果与硫化氢气氛中进行抗硫性能
Preface Nitric acid in addition to gold and platinum, with all metals, non-metallic and organic chemical reaction. 50% nitric acid is used at room temperature to titrate the corrosion resistance of copper and copper gold-containing passivation films. It is a rapid verification method that has been used by various departments for a long time. It is based on the surface of the parts dropped to the time after the bubble to test the corrosion resistance of the passive film. Testing standards for more than 6 seconds pass. This method can also be used to determine the anti-discoloration properties of immersion silver-tinted “TX” silver stains. Its measurement results are compared with the hydrogen sulfide gas for sulfur resistance