镀液成分对镀液性能和镀层质量的影响
|
摘要
在金刚石颗粒表面镀覆和金刚石-镍复合电镀中,电镀液的成分对镀液性能和镀层质量影响很大。用电子天平、金相显微镜、表面粗糙度测量仪和电化学工作站对镀层形貌、阴极增重、表面粗糙度、沉积电位、自腐蚀电位和自腐蚀电流密度进行检测和分析,探究电镀液中氯化镍、硼酸、十二烷基硫酸钠等成分的浓度变化对镀液性能和镀层质量的影响。结果表明,未加外界搅拌时,对镀层阴极增重影响最大的为硼酸,对镀层表面粗糙度、沉积电位、自腐蚀电位和自腐蚀电流密度影响最大的为氯化镍。综合考虑各项指标,电镀液中各成分浓度的最优配置为:NiSO_4·6H_2O 250g/L,NiCl_2·6H_2O_40g/L,H_3BO_320g/L,SDS 0.05g/L。镀层出现麻点是十二烷基硫酸钠和硼酸共同作用的结果,当镀液中十二烷基硫酸钠和硼酸的含量较低时,镀层会出现麻点。如果仅考虑自然对流,镀液的重复使用会促使十二烷基硫酸钠分子夹入到镀层之中,导致阴极增重量增加;镀液中氯化镍的浓度不均衡,会造成镀层各位置的耐腐蚀性能不一致,且镀层中间位置的耐腐蚀性能会比边缘好一些。
On diamond particle surface coating and diamond nickel composite electroplating,bath composition has a great influence on bath performance and coating quality.The coating morphologies,cathode weightgain,surface roughness,deposition potential,corrosion potential and corrosion current density were characterized by electronic balance,metallographic microscope,surface roughness tester and electrochemical workstation.The effect of the concentration of nickel chloride,boric acid and sodium dodecyl sulfate(SDS)on bath performance and coating quality was studied.It is found that boric acid has the greatest effect on the cathode weightgain,so do the nickel chloride on the surface roughness,deposition potential,corrosion potential and corrosion current density.As a result,the optimum process conditions of electroplating bath are as followed,NiSO_4·6 H_2O 250 g/L,NiCl_2·6 H_2O 40 g/L,H_3BO_3 20 g/L,SDS 0.05 g/L.The coating pitting appeared due to the combined effect of SDS and boric acid,and the condition is that the concentration of SDS and boric acid is low in the electroplating bath.The repeated use of the bath without stirring will increase the probability of SDS molecule into the coating,resulting in cathode weight gain increased.The concentration of nickel chloride in the bath is not balanced,which results in the corrosion resistance of the coatings in different positions is inconsistent,and the corrosion resistance in the middle of the coating is better than that at the edge.
On diamond particle surface coating and diamond nickel composite electroplating,bath composition has a great influence on bath performance and coating quality.The coating morphologies,cathode weightgain,surface roughness,deposition potential,corrosion potential and corrosion current density were characterized by electronic balance,metallographic microscope,surface roughness tester and electrochemical workstation.The effect of the concentration of nickel chloride,boric acid and sodium dodecyl sulfate(SDS)on bath performance and coating quality was studied.It is found that boric acid has the greatest effect on the cathode weightgain,so do the nickel chloride on the surface roughness,deposition potential,corrosion potential and corrosion current density.As a result,the optimum process conditions of electroplating bath are as followed,NiSO_4·6 H_2O 250 g/L,NiCl_2·6 H_2O 40 g/L,H_3BO_3 20 g/L,SDS 0.05 g/L.The coating pitting appeared due to the combined effect of SDS and boric acid,and the condition is that the concentration of SDS and boric acid is low in the electroplating bath.The repeated use of the bath without stirring will increase the probability of SDS molecule into the coating,resulting in cathode weight gain increased.The concentration of nickel chloride in the bath is not balanced,which results in the corrosion resistance of the coatings in different positions is inconsistent,and the corrosion resistance in the middle of the coating is better than that at the edge.
引文
[1]薛丽沙.人造金刚石表面镀覆及应用研究[D].郑州:中原工学院,2016.
[2]王秦生,王小军.金刚石表面镀层在磨具中的作用机理[J].金刚石与磨料磨具工程,2006,155(5):5-9.
[3]项东,李木森,许斌,等.镀覆金刚石技术的研究进展[J].超硬材料工程,2006,18(3):44-49.
[4]李云雁,胡传荣.试验设计与数据处理[M].北京:化学工业出版社,2009.
[5]王守兵,高虹,马梦迪.镍_二氧化锆复合电沉积工艺优化及其对钢表面的毛化效果[J].电镀与涂饰,2015,34(23):1335-1339.
[6]方莉俐.大面积自支撑金刚石-金属复合膜的电铸研究及其应用[D].郑州:郑州大学,2006.
[7]张晓明.普通镀镍槽液中加入十二烷基硫酸钠对镍镀层的影响[J].电镀与精饰,1978(7):18-24.
[2]王秦生,王小军.金刚石表面镀层在磨具中的作用机理[J].金刚石与磨料磨具工程,2006,155(5):5-9.
[3]项东,李木森,许斌,等.镀覆金刚石技术的研究进展[J].超硬材料工程,2006,18(3):44-49.
[4]李云雁,胡传荣.试验设计与数据处理[M].北京:化学工业出版社,2009.
[5]王守兵,高虹,马梦迪.镍_二氧化锆复合电沉积工艺优化及其对钢表面的毛化效果[J].电镀与涂饰,2015,34(23):1335-1339.
[6]方莉俐.大面积自支撑金刚石-金属复合膜的电铸研究及其应用[D].郑州:郑州大学,2006.
[7]张晓明.普通镀镍槽液中加入十二烷基硫酸钠对镍镀层的影响[J].电镀与精饰,1978(7):18-24.