The corrosion behavior of stainless steel exposed to a simulated salt lake atmosphere has been investigated by analyzing the evolution of surface morphologies and corrosion products, the initiation and development of pits, and the electrochemical characteristics. The results indicated that (Mg₆Fe₂(OH)₁₆(CO₃)(H₂O)_4.5)_0.25, a layered double hydroxide, has been detected for the first time in the corrosion products formed on stainless steel exposed to a simulated salt lake atmosphere. The specimens exposed to MgCl₂ deposit conditions were corroded more severely than those exposed to NaCl deposit conditions, which was attributed to the differences in the deliquescence relative humidity and efflorescence relative humidity values of MgCl₂ and NaCl. In addition, a special corrosion morphology consisting of a concentric circle of yellowish material was observed on the specimens exposed to MgCl₂ deposit conditions, which was attributed to the formation of Mg(OH)₂, inhibiting the diffusion and migration of OH⁻ ions to the anode region. The maximum pit depth followed a power function with respect to corrosion time. The corrosion mechanism of stainless steel exposed to a simulated salt lake atmosphere is also discussed.

中文翻译：

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模拟盐湖大气下304不锈钢的腐蚀行为

通过分析表面形貌和腐蚀产物的演变，凹坑的产生和发展以及电化学特性，研究了暴露在模拟盐湖气氛中的不锈钢的腐蚀行为。结果表明，在模拟暴露于不锈钢的不锈钢上形成的腐蚀产物中，首次检测到层状双氢氧化物（Mg ₆ Fe ₂（OH）₁₆（CO ₃）（H ₂ O）_4.5）_0.25。盐湖的气氛。暴露于MgCl ₂的样品MgCl ₂和NaCl的潮解相对湿度和风化相对湿度值的差异导致沉积条件比暴露于NaCl沉积条件下的腐蚀更为严重。此外，观察到在暴露于氯化镁试样由淡黄色材料的同心圆的特殊腐蚀形态₂存款条件下，这是由于与Mg（OH）的形成₂，抑制OH的扩散和迁移^-离子阳极区域。最大凹坑深度遵循关于腐蚀时间的幂函数。还讨论了不锈钢在模拟盐湖环境下的腐蚀机理。