缝隙腐蚀敏感性的电化学测量方法

• 机 构: 上海钢铁研究所八室腐蚀组
• 出 处: 上海钢研
• 发表日期: 1979年03期
• 关键词: 缝隙腐蚀 腐蚀形式 阳极反应 阴极反应 点蚀 浓差电池 卤化物 敏感性 溶解氧 局部破坏

一、前言 缝隙腐蚀是不锈钢在卤化物介质中的一种主要腐蚀形式,它比点蚀更容易发生,因而它的危害性比点蚀更大。缝隙腐蚀主要是氧的浓差电池所引起的,在缝隙里金属表面的溶解氧很快耗尽,造成不锈钢的纯化膜局部破坏,整个阴极反应在暴露的金属表面上发生,而缝隙里则发生金属溶解的阳极反应;

I. INTRODUCTION Crevice corrosion is a major form of corrosion of stainless steels in halide media and is more prone to pitting corrosion than pitting corrosion. Therefore, it is more harmful than pitting corrosion. Crevice corrosion is mainly caused by the concentration of oxygen in the cell, dissolved oxygen quickly disappears from the metal surface in the gap, resulting in partial destruction of the stainless steel purification membrane, the entire cathode reaction occurs on the exposed metal surface, and the gap occurs Metal-dissolved anode reaction;