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采用镀锌层破损面积不同的热镀锌汽车钢板试样,在含相同3.5%Cl-浓度的鹰潭泥浆和NaCl水溶液中进行了浸泡和浸没腐蚀实验,研究了镀锌板、基板和镀锌层不同程度破损试样在两种介质中的腐蚀规律.结果表明:完整镀锌层的腐蚀速率高于基板;镀锌层破损试样的腐蚀失重随镀锌层破损面积的增加而增大;在泥浆中的腐蚀速率比在溶液中大,且腐蚀速率随时间的变化不同.EIS分析结果表明,镀锌层破损试样的锌层在两种介质中的电荷转移电阻都比基材小得多,镀锌层的腐蚀对腐蚀失重结果起主要贡献.泥浆溶氧高和pH值低是造成镀锌层破损试样在两种介质中腐蚀行为明显不同的主要因素.
The galvanized steel sheets with different damaged area of galvanized coating were immersed and immersed in the Yingtan slurry and NaCl aqueous solution containing the same 3.5% Cl - concentration. The galvanized sheet, substrate and zinc coating The results show that the corrosion rate of the complete zinc coating is higher than that of the substrate. The corrosion weight loss of the zinc-plated coating increases with the increase of the damaged area of the zinc coating. The corrosion rate in mud is larger than that in solution and the corrosion rate varies with time.The results of EIS analysis show that the charge transfer resistance of the zinc layer in the zinciferous layer is much smaller than that in the substrate , The corrosion of galvanized layer contributes to the result of corrosion weight loss.High dissolved oxygen and low pH value are the main factors that cause the corrosion behavior of galvanized layer damaged sample to be obviously different in the two media.