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首页> 外文期刊>Journal of Materials Engineering and Performance >Corrosion Behavior of Arc-Sprayed Zn-Al Coating in the Presence of Sulfate-Reducing Bacteria in Seawater
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Corrosion Behavior of Arc-Sprayed Zn-Al Coating in the Presence of Sulfate-Reducing Bacteria in Seawater

机译：海水中硫酸盐还原菌存在下电弧喷涂Zn-Al涂层的腐蚀行为

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摘要

Zn-Al coatings were prepared by high-velocity arc spraying process and were sealed by the silicone resin to improve their corrosion resistance. The corrosion behavior of the unsealed and sealed Zn-Al coatings in the presence of sulfate-reducing bacteria (SRB) in seawater was evaluated, and the related mechanism was discussed. The results showed that the charge transfer resistance value of the sealed coating was almost ten times higher than that of the unsealed coating, and the concentration of element S in the covering layer of the former was half lower than that of the latter. The corrosion resistance of the coating was apparently improved by the sealing treatment. The corrosion rate of the coatings first increased and then decreased during the immersion time of 8 days in the seawater with SRB. The removal of the passive films in the initial period was attributed to penetration of the corrosion medium into the coating and the dissolution of the active zones inside the coating. The adhesion of SRB and accumulation of corrosion products on the coating surface would protect the coating from being further damaged.
机译：Zn-Al涂层通过高速电弧喷涂工艺制备，并通过硅树脂密封以提高其耐腐蚀性。评价了在海水中存在硫酸盐还原细菌（SRB）的情况下未密封和密封的Zn-Al涂层的腐蚀行为，并讨论了相关机理。结果表明，密封涂层的电荷转移电阻值几乎是未密封涂层的电荷转移电阻值的十倍，前者覆盖层中元素S的浓度比后者低一半。通过密封处理明显改善了涂层的耐腐蚀性。在SRB海水中浸泡8天后，涂层的腐蚀速率先上升然后下降。初始阶段钝化膜的去除归因于腐蚀介质渗透到涂层中以及活性区域在涂层内部的溶解。 SRB的附着力和腐蚀产物在涂层表面的积聚将保护涂层免受进一步损坏。

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