A phytic acid‐based surface tolerant epoxy coating was prepared, and the effect of phytic acid on the corrosion resistance of the composite coating on rusty carbon steel substrate was investigated. The results showed that the low‐frequency impedance modulus of the composite coating on rusty carbon steel could reached 10⁸ Ω·cm² order of magnitude after immersing for 480 h in 3.5 wt% NaCl solution. Compared with pure epoxy coating, the phytic acid‐based surface tolerant epoxy coating on the rusty substrate exhibited better corrosion resistance even if with some artificial defects in the composite coating. The protective performance of the composite coating mainly came from the formation of a stable iron phytate chelate in the reaction of phytic acid and rust. For the rusty carbon steel, the original Fe³⁺ on its surface was also transformed by phytic acid penetrating to the interface between the coating and the substrate. Therefore, a dense film was formed with the reaction of phytic acid and rust on the substrates, and the dense film became a part of the whole paint film, which could improve the corrosion resistance of the surface tolerant coating.

中文翻译：

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植酸基表面耐受涂料的防腐性能和除锈机理

制备了基于植酸的表面耐受性环氧涂层，并研究了植酸对生锈的碳钢基材上复合涂层耐蚀性的影响。结果表明，在生锈的碳素钢复合涂层的低频阻抗模量可以达到10 ⁸ Ω·cm的²在3.5％（重量）的NaCl溶液中浸泡480小时后的数量级。与纯环氧涂料相比，即使在复合涂料中存在一些人为缺陷，生锈基材上的植酸基表面耐受性环氧涂料仍具有更好的耐腐蚀性。复合涂层的防护性能主要来自植酸与铁锈反应中形成稳定的植酸铁螯合物。对于生锈的碳钢，原始的Fe ³⁺其表面上的植酸也通过植酸渗透到涂层和基材之间的界面而转变。因此，通过植酸与铁锈的反应，在基材上形成致密的膜，该致密的膜成为整个涂膜的一部分，从而可以提高表面耐性涂层的耐腐蚀性。