(110)晶面全择优取向镀锌层的制备及其耐蚀性能

Preparation of zinc electrodeposits with (110) lattice plane fully preferred orientation and its corrosion resistance

运用循环伏安法和X射线衍射技术研究两种添加剂对碱性锌酸盐体系中锌电沉积行为和镀锌层织构的影响,探讨制备(110)晶面全择优取向镀锌层的电沉积工艺条件,并用极化曲线和电化学阻抗谱研究(110)晶面全择优取向镀锌层的耐蚀性能。结果表明:添加剂A阻化锌的电沉积,有利于镀锌层(110)晶面择优取向;添加剂B对锌电沉积阻化作用和镀锌层的择优取向的影响不明显;基础镀液同时加入添加剂A和添加剂B,阻化作用最大,二者的协同作用可以获得(110)晶面全择优取向镀锌层。(110)晶面全择优取向镀锌层相对于呈随机生长的镀锌层自腐蚀电位正移了146 mV,腐蚀电化学阻抗值提高约7倍,镀锌层的结构影响其耐蚀性能。

Cyclic voltammetry and X-ray diffractometry were used to study the effect of two additives on the electrodeposition behavior and texture coefficient of zinc coating, the electrodeposition conditions for the preparation of zinc deposits with fully preferred orientation were obtained, and the corrosion resistance of zinc deposits with fully preferred orientation was also investigated by polarization curve and electrochemical impedance spectroscopy. The results show that the additive A inhibits zinc electrodeposition and is advantageous to preferred orientation of （110） plane of zinc coating, the inhibition of additive B is not obvious, the effect of additive B on the preferred orientation is also not obvious, the inhibition is maximum while additives A and B are used and results in fully preferred orientation of （110） plane because of their strong synergistic effect. The corrosion potential of the zinc coating with fully preferred orientation of （110） plane shifts 146 mV, the impedance value increases about 7 times comparing with that of the zinc coating with random orientation, the structure of zinc coating influences its corrosion resistance.