MoO_4^(2-)与Zn^(2+)对镁合金在NaCl溶液中的协同缓蚀作用  

Corrosion Inhibition Performance of Magnesium Alloy by MoO_4^(2-) in Combination with Zn^(2+) in NaCl Solution

作　　者：于湘[1] 俞志东 程丽华[1] 李燕[1] 

机构地区：[1]广东石油化工学院化工与环境学院,茂名525000

出　　处：《表面技术》2013年第1期35-38,共4页Surface Technology

基　　金：超轻材料与表面技术教育部重点实验室开放基金(20111009);广东石油化工学院自然科学基金(510009)

摘　　要：采用动电位极化曲线法,结合腐蚀后的表面微观形貌及EDS能谱分析,研究了MoO42-与Zn2+对AZ31镁合金在3.5%NaCl溶液中的协同缓蚀性能。结果表明:0.005 mol/L Zn2+与0.05 mol/L钼酸钠联合作用,可有效抑制镁合金在NaCl溶液中的腐蚀,Zn2+促进MoO42-在合金表面的吸附,缓蚀效果优于单一的钼酸盐缓蚀剂。缓蚀机制是:钼酸盐与Zn2+协同作用,使镁合金表面形成更为致密的钝化膜,从而抑制镁合金的腐蚀。The inhibition performance and mechanism of molybdate in combination with Zn2~ as inhibitors for magnesium alloy were studied in 3.5 % NaC1 solution by using potentiodynamic polarization curves. The results show that the synergistic inhibition by 0.05 moL/L molybdate in combination with 0. 005 mol/L Zn2＋ demonstrates strong inhibition to the corrosion of AZ31 magnesium alloy exposed to NaC1 solution. The adsorption acting of MoO42is promoted on the alloy surface by Zn2~, what hold better resistance performance than that of single molybdate corrosion inhibitor. The mixture consisting of molybdate and Zn2＋ is an inhibitor through forming a compact protective layer that covered the magnesium alloy surface.

关 键 词：镁合金 钼酸盐 Zn离子 缓蚀作用 

分 类 号：TG174.42[金属学及工艺—金属表面处理]