模拟地热水环境中304不锈钢管材的结垢与腐蚀电化学行为  

Scaling and electrochemical corrosion behavior of 304 stainless steel pipes in a simulated geothermal water environment

作　　者：吴坤湖[1] 李卫平[1] 刘慧丛[1] 朱立群[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院空天材料与服役教育部重点实验室,北京100191

出　　处：《北京科技大学学报》2009年第10期1263-1269,共7页Journal of University of Science and Technology Beijing

基　　金：国家高技术研究发展计划资助项目(No.2007AA05Z441)

摘　　要：基于地热水输送过程中金属管道材料出现的腐蚀结垢问题,研究了模拟地热水(我国中部平原地热水的环境条件)中304不锈钢管材的结垢和电化学腐蚀行为.结果表明,304不锈钢管在模拟地热水环境中的结垢过程分为结晶成核和晶核生长两个阶段,结晶成核阶段消耗结垢离子的速度比晶核生长阶段更快,304不锈钢管道表面结垢层的微观形貌为不规则的"稻草"状,地热水温度的变化促进了304不锈钢材料在模拟地热水中的点蚀敏感性,其表面钝化膜的保护性也随地热水温度的升高而降低.Based on the universal problem of steel pipes＇ corrosion and scaling in the transportation of geothermal water, the environmental conditions of geothermal water in the Chinese central plains was simulated to study the scaling and electrochemical corrosion behavior of 304 stainless steel pipes. The experiments results indicated that the scaling process of 304 stainless steel pipes in the simulated geothermal water was divided into two states, one was the nucleus-forming state, and the other was the nucleus growth state. The reducing rate of scaling ions in the nucleus-forming state was more than that in the nucleus growth state. The microcosmic appearance of scaling was straw-like abnormity. In addition, the change in temperature of geothermal water could accelerate 304 stainless steel＇s sensitivity of pitting corrosion, and the protective performance of 304 stainless steel＇s passive film decreased as the temperature of geothermal water increasing.

关 键 词：不锈钢管 地热水 结垢 腐蚀 

分 类 号：TG172.5[金属学及工艺—金属表面处理]