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Nickel-cobalt alloy coatings prepared by electrodeposition Part II: Morphology, structure, microhardness, and electrochemical studies
Korean Journal of Chemical Engineering ( IF 2.7 ) Pub Date : 2021-01-01 , DOI: 10.1007/s11814-020-0661-8
Rasha Muneer Al Radadi , Magdy Ahmed Mahmoud Ibrahim

A study was carried out to synthesize Ni-Co alloy coatings electrochemically from complex acidic glycine (gly) bath. The impacts of some operating parameters such as Co 2+ to Ni 2+ concentration ratios in the bath, gly concentrations, pH, applied current, plating time and temperature on the morphology of Ni-Co alloy were investigated. The microstructure, microhardness, and electrochemical studies were also investigated. The electrochemical studies utilized cyclic voltammetry, anodic linear stripping voltammetry, and potentiostatic current-time transient techniques. It was realized that gly lowers the cathodic overvoltage for the Co 2+ deposition while promoting cathodic overvoltage of Ni 2+ deposition. Accordingly, the concurrent codeposition of Co 2+ and Ni 2+ ions was simplified. The morphology of Ni-Co alloy is significantly dependent on the operating parameters rather than on the bath composition. Moreover, increasing either pH or bath temperature produces Ni-Co deposits free from cracking. The roughness of the alloy is decreased in the presence of gly as shown by the atomic force microscope (AFM) study. In the presence of gly, the microhardness increases from 387 to 970 kg f mm −2 , i.e., it increased more than two-and-a-half times. On the other hand, X-ray diffraction analysis (XRD) data show that the crystallinity decreases with enhancing the percentage of cobalt in the deposits.

中文翻译:

电沉积制备的镍钴合金涂层第二部分:形态、结构、显微硬度和电化学研究

进行了一项研究,以从复杂的酸性甘氨酸 (gly) 浴中电化学合成 Ni-Co 合金涂层。研究了一些操作参数,如镀液中 Co 2+ 与 Ni 2+ 的浓度比、甘氨酸浓度、pH、施加的电流、电镀时间和温度对 Ni-Co 合金形貌的影响。还研究了微观结构、显微硬度和电化学研究。电化学研究利用循环伏安法、阳极线性溶出伏安法和恒电位电流-时间瞬态技术。认识到gly降低了Co 2+ 沉积的阴极过电压,同时促进了Ni 2+ 沉积的阴极过电压。因此,简化了Co 2+ 和Ni 2+ 离子的同时共沉积。Ni-Co 合金的形貌主要取决于操作参数而不是镀液成分。此外,提高 pH 值或浴温会产生无裂纹的 Ni-Co 沉积物。如原子力显微镜 (AFM) 研究所示,在甘氨酸存在下合金的粗糙度降低。在gly 存在下,显微硬度从387 kg f mm -2 增加到970 kg f mm -2 ,即增加了两倍半以上。另一方面,X 射线衍射分析 (XRD) 数据显示结晶度随着沉积物中钴百分比的增加而降低。如原子力显微镜 (AFM) 研究所示,在甘氨酸存在下合金的粗糙度降低。在gly 存在下,显微硬度从387 kg f mm -2 增加到970 kg f mm -2 ,即增加了两倍半以上。另一方面,X 射线衍射分析 (XRD) 数据显示结晶度随着沉积物中钴百分比的增加而降低。如原子力显微镜 (AFM) 研究所示,在甘氨酸存在下合金的粗糙度降低。在gly 存在下,显微硬度从387 kg f mm -2 增加到970 kg f mm -2 ,即增加了两倍半以上。另一方面,X 射线衍射分析 (XRD) 数据显示结晶度随着沉积物中钴百分比的增加而降低。
更新日期:2021-01-01
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