Enhancement of the corrosion resistance of zinc-aluminum-chromium coating with cerium nitrate

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• 作者：Ke-bing Zhang ; Ming-ming Zhang ; Jing-fei Qiao ; Sheng-lin Zhang ; ^{zslhnxx2885@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Dacromet ; Cerium nitrate ; Corrosion resistance ; Electrochemical impedance spectroscopy
• 刊名：Journal of Alloys and Compounds
• 出版年：2017
• 出版时间：25 January 2017
• 年：2017
• 卷：692
• 期：Complete
• 页码：460-464
• 全文大小：675 K

文摘

The present work aims at evaluating the effect of cerium nitrate on corrosion resistance of mild carbon steel coated by Dacromet in 3.5% NaCl solution. The scanning electron microscope (SEM) and energy dispersive X ray spectroscope (EDX) analysis were carried out to compare the surface structure and the composition of Dacromet coating and Dacromet+Re coating. The results of the electrochemical measurement showed that, compared with Dacromet coating, Dacromet+Re coating had a longer controlled sacrificial anodic protection function to steel substrate, a lower corrosion current density (i_corr) and a higher corrosion potential (E_corr). The modulus values of |Z| of Dacromet+Re coating is about 1 order of magnitude higher than that of Dacromet coating at low-frequency region.