ABSTRACT Concomitant rust growth on a rust-free surface and conversion by a solution of tannin, propolis and benzoate has been investigated in the present study with the aim of producing a modified rust layer, more resilient and protective than a pure rust layer. Under such circumstances, balancing simultaneous but contradictory processes of corrosion acceleration by iron chelation and corrosion inhibition by ferric tannate precipitation is crucial for layer formation. Benzoate served as an iron corrosion inhibitor in the layer formation stage while the propolis added to the tannin solution improved the modified rust layer protective efficiency. Corrosion rates lower than 5 mpy that are acceptable from the practical viewpoint are attained with the inhibitor-modified rust layer, both, in quiescent solution and up to a linear velocity of the solution approximately equal to 1.5 m s−1. GRAPHICAL ABSTRACT

中文翻译：

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单宁基混合物的锈层生长和改性以降低钢在中性盐水溶液中的腐蚀速率

摘要 在本研究中，研究了无锈表面上伴随的锈生长和通过单宁、蜂胶和苯甲酸盐溶液的转化，目的是产生一种比纯锈层更有弹性和保护性的改性锈层。在这种情况下，平衡铁螯合引起的腐蚀加速和鞣酸铁沉淀抑制腐蚀的同时但相互矛盾的过程对于层的形成至关重要。苯甲酸盐在层形成阶段起到铁腐蚀抑制剂的作用，而添加到单宁溶液中的蜂胶提高了改性防锈层的保护效率。使用抑制剂改性的锈层可实现低于 5mpy 的腐蚀速率，从实用的角度来看是可以接受的，在静态解中，解的线速度大约等于 1.5 m s−1。图形概要