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
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Ca2+和Mg2+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Ca2+和Mg2+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.
地热水
腐蚀
结垢
galvanized steel pipe
geothermal water
corrosion
scaling
Abstract
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 Mg2+ 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 Ca2+ and Mg2+ 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.
中图分类号 TG172.5
所属栏目 试验研究
基金项目 国家863计划资助项目(2007AA05Z441)
收稿日期 2009/9/28
修改稿日期 2009/11/3
网络出版日期
作者单位点击查看
备注朱立群,教授,博士生导师.
引用该论文: CHEN Wei,LI Wei-ping,LIU Hui-cong,ZHU Li-qun. Corrosion and Scaling of the Galvanized Steel Pipe in Flowing Geothermal Water[J]. Corrosion & Protection, 2010, 31(8): 600～603
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参考文献
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【3】徐玉野,王全峰.热浸锌钢在模拟混凝土空隙液中电化学腐蚀行为[J].福州大学学报(自然科学版),2008,36(3):424-429.
【4】王宏伟,屠宝峰.地热供热系统腐蚀问题初探[J].辽宁化工,2003,32(7):300-301.
【5】Gabriella Stáhl,Gyrgy Pátzay,László Weiser,et al.Study of calcite scaling and corrosion processes in geothermal systems[J].Geothermics,2000,29(1):105-119.
【6】卢予北.河南地热(中井)井金属井管腐蚀与结垢试验研究[J].探矿工程(岩土钻掘工程),2004(8):49-52.
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