電沉積因瓦合金鍍層成分的影響因素

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

摘要: 采用電沉積方法在硫酸鹽體系中制得了Fe-Ni合金鍍層.研究了Fe²⁺與Ni²⁺的摩爾比、氯化亞鈰濃度、抗壞血酸濃度、鍍液溫度、pH、陰極電流密度和電沉積時間對鍍層鐵含量的影響規律,確定了適宜電沉積因瓦合金的最佳工藝條件,并采用EDS,XRD和TEM對所得鍍層進行了分析.驗證性實驗結果表明,制備的鍍層具有與因瓦合金相似的成分,其Fe和Ni質量分數分別為61.8%~62.1%和37.9%~38.1%,它是由單一的納米晶γ固溶體組成.

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.