锌-镍电沉积层的晶体结构及其电化学特征  

CRYSTAL STRUCTURES OF ELECTRODEPOSITED Zn-Ni COATINGS AND THEIR ELECTROCHEMICAL CHARACTERISTICS

作　　者：蔡加勒[1] 周绍民[1] 

机构地区：[1]厦门大学化学系物理化学研究所,361005

出　　处：《电镀与环保》1993年第3期3-5,42,共4页Electroplating & Pollution Control

摘　　要：改变锌-镍合金镍液中 ZnCl_2的浓度可电沉积得到含 Ni 量不同的 Zn-Ni 合金镀层。X-射线衍射表明,Ni 含量≤7.0wt.%、在10.2～21.5wt.%范围和≥69.5wt.%的 Zn-Ni 合金镀层表现很强的择优取向,取向轴分别为六方结构的<101>、复杂立方结构的<442>+<600>和面心立方结构的<111>。Zn-Ni 合金镀层的相-组成图与热熔合金在常温下的平衡相图不同。Ni 含量为25～61wt.%可能存在新相,XZN-2添加剂促进该相的形成和晶拉的择优取向。阳极溶出伏安结果表明,Zn-Ni 合金镀层的阳极溶出峰电位与镀层的相结构存在对应关系,有可能用峰电位来表征相应的相组成。Zn-Ni alloy deposits with different Ni content can be obtained by changing concentration of ZnCl_2 in bath.X-ray diffraction analysis shows Zn-Ni alloy deposits with Ni content≤7.0 wt.%, in range of 10.2～21.5 wt.% and≥69.5 wt.% possess preferred orientation of <101>of hcp, <442>+<60(?)>of complex cubic and<111>of fcc respectively.Phase-composition diagram of Zn-Ni alloy deposits is different from that of pyrometallurgically prepared in equilibrium at normal temperature.New phase is found in alloy containing 25～61 wt.% Ni.Formation of new phase and preferred orientation are promoted by XZN-2 additive in bath.Peak potentials on anodic stripping curves of deposits depends strongly on their phase structure,and it can be used to characterize phase composition.(p.3—5)

关 键 词：锌-镍合金 电沉积层 晶体结构 

分 类 号：TQ153.2[化学工程—电化学工业]