Effect of Annealing on Corrosion Resistance of Zn-Mg Coatings Deposited by Vacuum Plating
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摘要: 为了研究不同的合金化退火工艺对真空蒸镀Zn-Mg合金镀层耐蚀性的影响, 通过酸性盐雾试验、Na2SO4全浸泡腐蚀试验及电化学腐蚀试验对镀层的腐蚀特性进行了研究, 并采用X射线衍射对腐蚀前后的相组成进行了分析。研究结果表明, 真空蒸镀Mg层后, 合金化退火工艺为410℃保温30 s时所得镀层的耐蚀性较好, 在全浸腐蚀试验中, 其耐蚀性约是纯Zn镀层的40倍。另外, 合金化退火后在锌镁界面形成的共晶MgZn2相和Mg2Zn11相有利于提高镀层的耐蚀性, Zn-Mg合金镀层在盐雾试验后生成的腐蚀产物所含组分的种类与纯Zn镀层的相似, 主要由致密的碱式氯化锌[Zn5 (OH) 8Cl2·H2O]、碱式碳酸锌[Zn4CO3 (OH) 6·H2O]、Zn5 (CO3) 2 (OH) 6和少量的ZnO等构成。Abstract: The Zn-Mg alloy coatings were synthesized by vacuum plating on galvanized steel sheet.The effect of the annealing temperature/time on the corrosion resistance was investigated with X-ray diffraction and in acetic acid-salt spray (AASS), Na2SO4 full immersion corrosion and electrochemical corrosion tests.The results show that the optimized annealing conditions significantly enhanced the corrosion resistance of the Zn-Mg alloy coatings.To be specific, annealing at 410℃ for 30 s increased the corrosion resistance by 40 times in full immersion corrosion test, possibly because the corrosion resistance of the eutectic MgZn2 and Mg2Zn11 phases, formed at the interface of Zn and Mg layers in annealing, were five times higher than that of Zn-coating.Besides, the corroded products in AASA test comprise the compact Zn5 (OH) 8Cl2·H2O, Zn4CO3 (OH) 6·H2O, Zn5 (CO3) 2 (OH) 6 and a little ZnO, being similar to those of Zn-coating.
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Keywords:
- Vacuum evaporation /
- Zinc-magnesium alloy /
- Annealing process /
- Corrosion resistance
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