【摘要】 采用Ni-纳米TiO2复合电镀对16MnR钢焊缝进行表面处理,运用均匀设计方法,研究了镀液温度、阴极电流密度、搅拌速度、纳米TiO2浓度等对复合电镀过程的影响,优选出Ni-纳米TiO2复合电镀的最佳工艺配方。借助金相显微镜、扫描电镜(SEM)与能谱仪(EDS)对复合镀层的微观形貌、组织结构及成分组成进行测试分析。恒载荷拉伸试验结果表明:普通电镀层的抗湿H2S应力腐蚀性能是无镀层的1.9倍,而Ni-纳米TiO2复合电镀层的抗湿H2S应力腐蚀性能是无镀层的4.1倍;镀层中纳米材料的引入,使得金属表面局部晶粒纳米化,提高了16MnR焊缝抗湿H2S应力腐蚀的能力。更多还原

【Abstract】 16MnR steel weldment surface was treated with Ni-nano-TiO2 composite electroplating.The impact of bath temperature, cathode current density, stirring speed,nano-TiO2 concentration on electroplating process of the composite was studied by orthogonal experimental methods,and the optimum conditions of the Ni-nanometer TiO2 composite plating was selected.The morphology,structure and composition of composite coating were analyzed by metallurgical microscope,scanning electron microscopy(SEM) and spectrometer (EDS).The results of constant load tensile experiments show that the anticorrosion performance of wet H2S stress of general electroplating is the 1.9 times of that of no plating,nanometer composite electroplating is the 4.1 times of that of no plating.The introduction of nano-materials in the plating makes metal surface nanocrystallization,which improves the anticorrosion performance of wet H2S stress of 16MnR steel weldment.更多还原