In order to better understand why the corrosion behavior of carbon steel exposed in Nansha atmospheric environment is very serious, the effect of sodium, potassium and magnesium chlorides deposited on carbon steel surface has been studied under atmosphere conditions by wet/dry accelerated test. The difference of corrosion behavior and surface structure in Na⁺, K⁺, and Mg²⁺ containing atmosphere has been investigated by thickness loss, scanning electron microscope, X-ray diffraction and electrochemical techniques. The results indicate that the thickness loss of carbon steel exposed in different metal cations containing atmospheric environment increases in the order of Na⁺, K⁺, Mg²⁺. The hard metal cation can promote the dissolution of the steel to a certain extent. In Mg²⁺ containing atmosphere, the relative content of β-FeOOH is rather higher and the protective ability index α*/γ* decreases in the order of Na⁺, K⁺, Mg²⁺. The corrosion current density of both bare carbon steel and the rusted carbon steel increases in the order of Na⁺, K⁺, Mg²⁺. The polarization resistance and the charge transfer resistance decreases in the order of Na⁺, K⁺, Mg²⁺.

中文翻译：

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金属阳离子对氯离子气氛中碳钢腐蚀行为和表面结构的影响

为了更好地理解为什么碳钢在南沙大气环境中的腐蚀行为非常严重，在大气条件下，通过湿/干加速试验研究了碳钢表面上钠，钾和镁氯化物的沉积效果。通过厚度损失，扫描电子显微镜，X射线衍射和电化学技术研究了含Na ⁺，K ⁺和Mg ²⁺的气氛中腐蚀行为和表面结构的差异。结果表明，在不同的含金属阳离子的大气环境中暴露的碳钢厚度损失按Na ⁺，K ⁺，Mg ²⁺的顺序增加。。硬金属阳离子可以在一定程度上促进钢的溶解。在含Mg ²⁺的气氛中，β -FeOOH的相对含量较高，保护能力指数α * / γ *依次降低为Na ⁺，K ⁺，Mg ²⁺。裸碳钢和生锈碳钢的腐蚀电流密度均按Na ⁺，K ⁺，Mg ²⁺的顺序增加。极化电阻和电荷转移电阻按Na ⁺，K ⁺，Mg ²⁺的顺序降低。