304不锈钢丝镀铜表面氧化腐蚀行为研究

Study on Surface Oxidation and Corrosion Behavior of Stainless Steel Wire Electroplated Copper

使用金相显微镜、扫描电镜、能谱分析等手段对304不锈钢电镀铜丝表面氧化以及氯离子对镀铜丝的点腐蚀进行了研究,结果表明:在空气环境自然氧化条件下,镀铜丝表面氧化物有Cu_(2)O,CuO,Cu_(2)(OH)_(2)CO_(3)等,三种物质调和出十分复杂的镀铜丝表面氧化颜色;镀铜层的表面疏松粗糙会增进表面氧化。氯离子质量分数含量为6.27%时,镀铜丝铜层表面被腐蚀,没有腐蚀到不锈钢基体;氯离子质量分数含量为17.17%时,镀铜不锈钢丝基体完全腐蚀,镀铜丝腐蚀断裂。镀铜丝表面在35℃以上空气环境中点腐蚀严重,在25℃以下没有出现腐蚀。

The surface oxide and the point corrosion of chloride ion on copper plated wire of 304 stainless steel are studied by means of metallographic microscope,SEM and EDS etc.The results showed that:there are oxides such as Cu_(2)O,CuO,Cu_(2)(OH)_(2)CO_(3) on the surface of copper plated wire under the natural oxidation condition of air environment.The three kinds of substances harmonize the very complex surface oxidation color of copper plating wire,the surface of copper plating layer is loose and rough,which will enhance the surface oxidation.When the weight fraction of chloride ions is 6.27%,the surface of the copper layer is corroded,but the stainless steel substrate is not corroded.When the weight fraction of chloride is 17.17%,the metal matrix of copper-plated stainless steel wire is completely corroded,and the copper-plated stainless steel wire is corroded and fractured.The surface of the copper plating wire is seriously corroded in the air temperature above 35℃,but there is no corrosion below 25℃.