镀锌钢管在流动地热水环境中的腐蚀与结垢  

Corrosion and Scaling of the Galvanized Steel Pipe in Flowing Geothermal Water

作　　者：陈伟[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

出　　处：《腐蚀与防护》2010年第8期600-603,614,共5页Corrosion & Protection

基　　金：国家863计划资助项目(2007AA05Z441)

摘　　要：针对地热水环境中镀锌钢管的腐蚀结垢问题,将镀锌钢管分别置于流动和静止的地热水环境中,观察其自腐蚀电位、质量、微观形貌以及地热水中结垢离子浓度等变化。研究发现,在流动的地热水环境中镀锌钢管主要以腐蚀为主,质量增加较快;在试验77 h后,地热水中的Ca^2＋和Mg^2＋离子不再消耗。而在静止地热水环境中镀锌钢管以表面结垢为主,质量增加速度慢,在同样的试验时间（77 h）,表面结垢仍在进行,地热水中的Ca^2＋和Mg^2＋离子仍在消耗。另外,流动地热水环境中镀锌钢管表面自腐蚀电位变化与静止地热水环境中的电位变化不同,流动地热水加速了镀锌钢管表面的冲刷,使得表面结垢物沉积量降低,甚至会影响结垢物的形貌。By immersion testing in flowing system and static system,the corrosion and scaling behavior of galvanized steels were studied.The corrosion potential,weight,microstructure of the samples and the concentration of scale ions contained in both kinds of system were also investigated.The results showed that the corrosion process was considered to be the main process on the surface of the sample soaked in the flowing system.The weight of the sample gained rapidly,but the concentration of Ca2＋ and Mg^2＋ in the water didn＇t change any more after soaked for 77 h.The main process of the sample soaked in the static system was scaling.The weight gained slowly,and the consumption of Ca^2＋ and Mg^2＋ continued even at the end of the experiment,indicating that the scaling was still kept on in this system.The corrosion potentials of samples in both systems were also different from each other.In addition,the flowing geothermal water could wash the surface of the samples,which made deposition of the scales more difficult and even affected their morphology.

关 键 词：镀锌钢管 地热水 腐蚀 结垢 

分 类 号：TG172.5[金属学及工艺—金属表面处理]