Purpose

This study aims to develops a new-type low-alloy corrosion resistant steel containing Sb and investigate the corrosion mechanism of this new-type low-alloy steel.

Design/methodology/approach

Energy dispersive spectrometer, X-ray photoelectron spectroscopy, X-Ray diffraction and scanning electron microscopy were used to evaluate the corrosion resistance of the rust layers formed on these samples. Laser confocal microscopy was used to observe the corroded surfaces of the steels.

Findings

Results showed that Sb added can consume H⁺ in the solution, thereby preventing the oxygen reaction to slow down the corrosion rate. Meanwhile, a stable and insoluble substance (Sb₂O₃) in the acidic solution would be produced when the reaction of the product of Sb and H⁺ with the enough dissolved oxygen in the solution. Due to the precipitation of Sb₂O₃ and iron oxyhydroxides, the rust layer of Sb-containing steel became more uniform and compact, which resulted in better corrosion resistance in acid environment.

Originality/value

In this study, a new-type acid resistant low-alloy steel containing Sb was developed. Compared with the results, the corrosion mechanism of the new-type low-alloy steel in acid environment was discussed.

中文翻译：

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酸性环境中含Sb的新型低合金耐蚀钢的腐蚀机理

目的

本研究旨在开发一种新型的含Sb的低合金耐蚀钢，并研究这种新型的低合金钢的腐蚀机理。

设计/方法/方法

使用能量分散光谱仪，X射线光电子能谱，X射线衍射和扫描电子显微镜来评估在这些样品上形成的防锈层的耐腐蚀性。用激光共聚焦显微镜观察钢的腐蚀表面。

发现

结果表明，添加的Sb可以消耗溶液中的H ⁺，从而防止氧反应减慢腐蚀速率。同时，当Sb和H ⁺的产物与溶液中足够的溶解氧反应时，将在酸性溶液中产生稳定且不溶的物质（Sb ₂ O ₃）。由于Sb ₂ O ₃和羟基氧化铁的沉淀，含Sb钢的锈层变得更均匀致密，从而在酸性环境下具有更好的耐腐蚀性。

创意/价值

在这项研究中，开发了一种新型的含Sb的耐酸低合金钢。并与结果进行了比较，探讨了新型低合金钢在酸性环境下的腐蚀机理。