基于电化学法的再生水腐蚀不锈钢供热管网的试验与机理  

Experiment and mechanism of regenerated water corrosion on stainless steel heating pipe network based on electrochemical method

作　　者：崔建民 CUI Jianmin(Lanzhou Thermal Power Corporation,Lanzhou 730020,China)

机构地区：[1]兰州热力总公司,甘肃兰州730020

出　　处：《粘接》2023年第8期122-125,共4页Adhesion

摘　　要：针对再生水输配管易受水质中离子腐蚀的问题,通过电化学极化曲线对2种不锈钢材料的耐腐蚀性能进行研究,以得到耐腐蚀性能良好的再生水输配管材料。结果表明:再生水中氯离子是腐蚀不锈钢的主要因素,在低浓度状态下,不锈钢能有效抵抗氯离子的侵蚀,当体系内氯离子浓度达到100 mg/L时,氯离子对不锈钢的腐蚀加剧。当体系共存高浓度硫酸根离子时,会抑制氯离子对不锈钢材料的腐蚀。2种材料受离子腐蚀的机理类似,但316L不锈钢的耐腐蚀性能更优,可以作为再生水输配管材料使用。对再生水原水进行测试,原水中的腐蚀电位较单一离子模拟再生水腐蚀电位更正,腐蚀电流也更低,不锈钢的耐腐蚀性能更高。Aiming at the problem that the reclaimed water pipeline is vulnerable to ion corrosion in water quality,the corrosion resistance of two kinds of stainless steel materials is studied through the electrochemical polarization curve in order to obtain the reclaimed water pipeline material with good corrosion resistance.The test results show that the chloride ion in the reclaimed water is the main factor for corrosion of stainless steel.At low concentration,stainless steel can effectively resist the corrosion of chloride ion.When the concentration of chloride ion in the system reaches 100 mg/L,the corrosion of chloride ion on stainless steel is intensified.When the system coexists with high concentration of sulfate ion and low concentration of calcium ion and bicarbonate ion,the corrosion of chloride ion on stainless steel will be inhibited.The mechanism of ion corrosion of the two materials is similar,but the corrosion resistance of 316L stainless steel is better,which can be used as the material of reclaimed water pipeline.The corrosion potential in the raw water of the reclaimed water is more positive compared with the corrosion potential of the single ion simulated reclaimed water,the corrosion current is also lower,and the corrosion resistance of stainless steel is higher.

关 键 词：再生水水质 不锈钢腐蚀 自腐蚀电流 电化学极化曲线 

分 类 号：TQ150[化学工程—电化学工业] TU990.3[建筑科学—市政工程]