电沉积因瓦合金镀层成分的影响因素

Influences of process parameters on the composition of an electrodeposited invar alloy coating

摘要: 采用电沉积方法在硫酸盐体系中制得了Fe-Ni合金镀层.研究了Fe²⁺与Ni²⁺的摩尔比、氯化亚铈浓度、抗坏血酸浓度、镀液温度、pH、阴极电流密度和电沉积时间对镀层铁含量的影响规律,确定了适宜电沉积因瓦合金的最佳工艺条件,并采用EDS,XRD和TEM对所得镀层进行了分析.验证性实验结果表明,制备的镀层具有与因瓦合金相似的成分,其Fe和Ni质量分数分别为61.8%~62.1%和37.9%~38.1%,它是由单一的纳米晶γ固溶体组成.

Abstract: A Fe-Ni alloy coating was prepared in a sulfate bath by electrodeposition. The influences of process parameters, such as Fe²⁺/Ni²⁺ molar ratio, CeCl₃ concentration, ascorbic acid concentration, bath temperature, pH, cathodic current density and deposition time, on the ferrous content in the coating were studied. An optimum process condition was determined for the electrodeposition of invar alloy. The coating obtained under the optimum condition was analyzed by EDS, XRD and TEM. The results showed that the mass fractions of Fe and Ni in the coating were 61.8%-62.1% and 37.9%-38.1%, respectively, similar to those of invar alloy, and the coating was solely composed of nanocrystalline γ solid solution.