| 不锈钢点蚀多发生在含有碘、氯、溴等水溶液环境中 |
| 添加时间：2024/1/5 16:47:40 浏览次数： |
| 不锈钢点蚀多发生在含有碘、氯、溴等水溶液环境中。产生不锈钢点蚀的原因是氯离子是活性阴离子，容易被吸附，挤走氧原子，和钝化膜中的阳离子反应生成可溶性的氯化物，破坏钝化膜，形成小孔，成点蚀诱因阶段，在该阶段形成闭塞电路，发生电流腐蚀现象。 Stainless steel pitting often occurs in aqueous solutions containing iodine, chlorine, bromine, and other substances. The reason for the occurrence of pitting corrosion in stainless steel is that chloride ions are active anions that are easily adsorbed, squeeze out oxygen atoms, and react with cations in the passivation film to form soluble chlorides, which destroy the passivation film, form small pores, and become the cause of pitting corrosion. At this stage, a closed circuit is formed, leading to current corrosion phenomenon. 防范措施： Preventive measures: 1、在已知可能发生点蚀的环境中选择恰当的不锈钢材质，实验表明钼元素（Mo）或锰元素（Mn）含量越高的不锈钢，抵抗点蚀的能力就越强； 1. Selecting appropriate stainless steel materials in environments where pitting corrosion is known to occur, experiments have shown that stainless steel with higher molybdenum (Mo) or manganese (Mn) content has stronger resistance to pitting corrosion; 2、控制与不锈钢接触液体的酸碱度，氯化物浓度以及温度； 2. Control the pH, chloride concentration, and temperature of the liquid in contact with stainless steel; 3、阴极保护，阳极保护或者同时采取这两种保护措施； 3. Cathodic protection, anodic protection, or both protective measures taken simultaneously; 4、尽可能使用质量更好的不锈钢，如316或316L，来提高不锈钢风管的耐点状腐蚀性能。 4. Try to use high-quality stainless steel, such as 316 or 316L, as much as possible to improve the pitting corrosion resistance of stainless steel ducts. |
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