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首页> 外文期刊>RSC Advances >Deciphering the formation mechanism of a protective corrosion product layer from electrochemical and natural corrosion behaviors of a nanocrystalline zinc coating
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Deciphering the formation mechanism of a protective corrosion product layer from electrochemical and natural corrosion behaviors of a nanocrystalline zinc coating

机译：从纳米晶锌涂层的电化学腐蚀和自然腐蚀行为来解释保护性腐蚀产物层的形成机理

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The corrosion resistance improvement of a zinc coating with the reduction of grain size from micro to nano-scale has long been attributed to the formation of better protection of the corrosion product layer. However, the formation mechanism of the protective corrosion product layer has rarely been studied. Here nanocrystalline zinc coatings are produced by pulse reverse electrodeposition in a sulfate bath with polyacrylamide as the only additive. The electrochemical and natural corrosion behaviors of an electrodeposited nanocrystalline zinc coating in comparison with a conventional coarse-grained zinc coating in simulated seawater are investigated. The nanocrystalline zinc coating exhibits distinctly enhanced corrosion resistance in the simulated seawater compared to the coarse-grained zinc coating. The enhanced corrosion resistance of zinc coatings with the reduction of grain size from micro (6 mm) to nano-scale (31 nm) is due to the fact that the nanocrystalline zinc coating is characterized by a high-volume fraction of grain boundaries, and the zinc atoms at grain boundaries possess a higher activity. This is beneficial for rapidly forming a protective corrosion product film with a hydrophobic nano-wire structure on the surface of the zinc coating during the exposure to simulated seawater, thereby contributing to the corrosion resistance enhancement. Based on analysis results, the possible formation mechanism of a protective corrosion product layer on the surface of the nanocrystalline zinc coating is discussed in detail.
机译：长期以来，归因于对腐蚀产物层的更好保护，锌涂层的耐腐蚀性随着晶粒尺寸从微米级减小到纳米级而得到改善。但是，很少研究腐蚀保护层的形成机理。在这里，纳米晶锌涂层是通过在硫酸盐浴中以聚丙烯酰胺为唯一添加剂的脉冲反向电沉积来生产的。研究了电沉积纳米晶锌涂层与常规粗粒锌涂层在模拟海水中的电化学行为和自然腐蚀行为。与粗粒锌涂层相比，纳米晶锌涂层在模拟海水中表现出明显增强的耐腐蚀性。锌涂层的耐蚀性增强，其晶粒尺寸从微米（6 mm）减小到纳米级（31 nm），这是由于以下事实：纳米晶锌涂层的特征在于大量晶界，并且晶界处的锌原子具有较高的活性。这对于在暴露于模拟海水期间在锌涂层的表面上快速形成具有疏水性纳米线结构的保护腐蚀产物膜是有利的，从而有助于提高耐腐蚀性。基于分析结果，详细讨论了纳米晶锌涂层表面保护性腐蚀产物层的可能形成机理。

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