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《Materials Protection》 2005-05
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Couple Corrosion Behavior of Die Casting Magnesium Alloy in Antifreeze Solution

TONG Zhensong, ZHANG Wei, LI Jiuqing, GENG Jun, CHENG Fei (Corrosion and Protection Center, College of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China).  
The galvanic corrosion behavior of die casting AZ91D magnesium alloy coupled with A3 steel, H62 brass, LF21 aluminum alloy, and 356~# casting aluminum in the automobile antifreezing solution at 80 ℃ was studied. The free corrosion potentials, galvanic potentials, and currents of the galvanic couples were measured. The results showed that AZ91D magnesium alloy always acted as the anode as it was coupled with the four kinds of metal or alloy materials, and the anodic process of the galvanic couple for the coupled systems was greatly inhibited. The AZ91D magnesium alloy coupled with A3 steel, H62 brass, LF21 aluminum alloy, and 356~# casting had an increased anodic dissolution rate by a magnitude less than one order as compared with the uncoupled one, and the galvanic couple corrosion effect of the four types of couples was ranked as γ_(356#Al)γ_(LF21)γ_(H62)γ_(A3).
【Fund】: 国家自然科学基金资助项目(50122115)
【CateGory Index】: TG172
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