镁合金在水-乙二醇体系中的电偶腐蚀及缓蚀剂

研究了AZ91D压铸镁合金分别与Q235钢、H62黄铜、LF21铝合金及356#铸铝偶接在水-乙二醇体系中的电偶腐蚀行为和规律,并对加入开发的有机-无机复配缓蚀剂前后的腐蚀行为差异和缓蚀效果作出了评价.结果表明,加入缓蚀剂后不仅降低了电偶对中镁合金的全面腐蚀,而且有效抑制了点蚀.通过电偶腐蚀电化学参量的测量和动电位极化曲线的测量发现,AZ91D压铸镁合金的电偶腐蚀由加入缓蚀剂前的阴极控制转变为阳极控制,且对阳极过程抑制显著.

Inhibitor and the corroding behavior for a magnesium alloy in an ethylene glycol solution system

This paper investigated the galvanic corrosion behavior and laws of AZ91D magnesium alloy coupled with other four metals(Q235 carbon steel,H62 brass,LF21 aluminum alloy,and 356~# cast alu- minum)in ethylene glycol solution and the difference before and after inorganic-organic salt compounds were added into the solution as an inhibitor,and then discussed the effect of this inhibitor.It was found that not only uniform corrosion was reduced but also pit corrosion was abated effectively by adding the in- hibitor of inorganic-organic salt compounds into the ethylene glycol solution system.By scouting the change of electrochemical parameters and mapping the polarization curves it was found that cathodic control was re- placed by anodic control in the process of galvanic corrosion and the effect on anode was more obvious.