摘要：

采用电化学法研究了循环水中304不锈钢点蚀电位(E_b)、蚀孔深度、蚀孔数量与氯离子浓度的关系。结果表明, 常温下304不锈钢的E_b总是随着氯离子浓度的增大而减小, 当氯离子质量浓度小于800 mg/L时, 增大氯离子浓度易导致点蚀敏感, 而大于该值时增大氯离子浓度不会明显增大点蚀倾向;从蚀孔深度和表面蚀孔数量得出的304不锈钢点蚀倾向由大变小的氯离子质量浓度阈值为770 mg/L。

关键词: 循环水, 304不锈钢, 点蚀, 阈值

Abstract:

The relationship between pitting corrosion potential(E_b) of 304 stainless steel in circulating cooling water and the pit depth and pit number with chloride ion concentration has been studied by electrochemistry.The results show that the E_b always reduces with the increase of chloride ions concentration at room temperature.The tendency of pitting corrosion increases when the chloride ion mass concentration is less than 800 mg/L.And, the pitting corrosion does not have obvious increase, when the chloride ion mass concentration is higher than 800 mg/L.The threshold value of chloride ion mass concentration of the pitting corrosion tendency of 304 stainless steel obtained by the depth and number of surface pits is 770 mg/L.

Key words: circulating cooling water, 304 stainless steel, pitting corrosion, threshold value

中图分类号: 

• TQ085+.412