镀锌液的组元活度对镀液呈色特点的影响  

Effect of Component Activity on Coloration Feature of Hot-Dip Galvanization Bath

作　　者：乐启炽[1] 崔建忠[1] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2011年第7期972-975,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50974037)

摘　　要：热镀锌液中适量添加过渡元素并通过镀后冷却条件控制,可在热镀钢板或钢构上直接获得具有特定色彩的镀锌层,是一种有应用前景的新工艺.从热力学角度理解热镀层呈色的机理与特点将有助于镀液组成的进一步优化.用Miedema模型、Tanaka关系式以及一些基本热力学关系研究了镀液中的主溶质元素或杂质对镀液各组元的过剩热力学性质的影响.结果表明,镀件镀后呈色特点与镀液中的溶质活度直接相关.溶质浓度和浸镀温度对镀层呈色的影响主要归咎于其对呈色溶质元素活度的影响.镀液中的杂质如Al和Mg以及呈色元素Ti对呈色的影响还与其对溶剂活度的影响有关.The special color coating on steel sheets or members could be obtained in hot galvanization processing while the bath contains some transitional elements together with the cooling control.Understanding its coloration mechanism from a thermodynamic point of view is helpful for further bath composition optimization due to its potential industrial application.The effects of the main solute elements and impurities in the zinc bath on its excess thermodynamic properties were investigated through the Miedema model and Tanaka relationship together with some basic thermodynamic equations.The results indicated that the activities of solute elements in the bath are closely related to its color generation feature.The effects of solute concentration and hot dip temperature on the bath coloration ability should owe to their effects on the solute activities in zinc bath.The effects of impurities such as Al and Mg and color generation solute Ti are related with their effects on the solvent activity.

关 键 词：热镀锌 镀液组成 浸镀温度 呈色 活度 

分 类 号：TG174.443[金属学及工艺—金属表面处理] TF01[金属学及工艺—金属学]