采用宏观检验、金相检验、扫描电镜分析以及能谱分析等方法对某VAMTOP套管接箍镀铜层变色的原因进行了分析。结果表明: 接箍镀铜层变色主要是由于镀铜层的表层铜发生氧化生成了铜的氧化物所致; 该灰褐色氧化物变色层并未深入全镀铜层, 不影响镀铜层与基体的结合, 变色对接箍镀铜层的使用性能并未造成不良影响。

Tarnishing reason of copper plate of VAMTOP casing couplings was analyzed by means of macro examination, microstructure examination, SEM analysis and X-ray energy spectrum analysis. The results show that the main reason for the tarnishing of the copper plating was that the surface copper oxidized and generated copper oxide. The dust color copper oxides hadn’t occupied the whole copper layer, and it wouldn’t destruct the combination of copper plate with matrix material. The tarnishing had no harmful effects on the service performance of the copper plate of the casing couplings.