对于黄铜的黑化处理，我国相当多的企业采用红液化学发黑工艺，当然也有的单位通过电镀黑镍来达到零件消光目的。一般黑镍与氨液发黑膜层各有其优缺点，前者容易变色，但外观质量较佳；后者耐磨性能尚可，外观质量欠佳。不过，这种“对比”并非一成不变的。笔者有机会接触到欧洲? For the blackening of brass, a considerable number of enterprises in our country using red chemical blackening process, of course, some units through the black nickel plating to achieve the purpose of extinction parts. The general black nickel and ammonia black film has its own advantages and disadvantages, the former easily discolored, but the appearance of better quality; the latter wear resistance is acceptable, the appearance of poor quality. However, this “contrast” is not static. I have the opportunity to come into contact with Europe?