无铅高锌硅黄铜脱锌腐蚀性能的研究

Research on Dezinc Corrosion Resistance of Lead-Free High Zinc Silicon Brass

通过测量硅黄铜脱锌腐蚀层厚度,观察脱锌层形貌以及能谱分析,发现一定量的RE、B、Zr均能提高硅黄铜的耐脱锌腐蚀能力,添加0.004%B的硅黄铜的抗脱锌腐蚀能力最好;B促进了SiO2氧化膜以及分布在晶界处的Cu3P化合物的生成,从而提高了耐脱锌腐蚀能力;β+γ两相黄铜脱锌腐蚀优先从β相和γ相相界开始,继而腐蚀β相,再到γ相,故γ相耐脱锌效果较β相好。

By measuring the thickness of dezinc layer,observing the morphology of dezinc layer and analyzing its composition by energy spectrum,it is found that a certain amount of RE,B or Zr can improve the dezinc corrosion resistance of silicon brass.The silicon brass with 0.004% B addition has the best dezinc corrosion resistance.This is because that B increases the formation of SiO2 oxidation film and Cu3P compound at the grain boundary.The dezinc corrosion of β＋γ phases starts preferentially from the grain boundary of β and γ phases,then the β phases,and finally the γ phases,so γ phase has better dezinc corrosion resistance than β phase.