模拟地热水中碳钢和镀锌钢管的腐蚀结垢规律
Corrosion and Scaling on Carbon Steel and Galvanized Steel Pipe in Simulated Geothermal Water
摘 要
针对地热能源利用过程中钢管材料出现的腐蚀结垢问题,模拟中部平原地热水的环境条件,探讨了地热水的结垢趋势以及20#钢、镀锌钢在80 ℃、65 ℃、50 ℃下的腐蚀和结垢规律.结果表明,在模拟地热水中,65 ℃、50 ℃试验条件下,20#钢表面形成的腐蚀结垢产物疏松,导致其腐蚀速率较快;而镀锌钢表面的锈垢混合物致密,有效减缓了镀锌钢的腐蚀速率.在80 ℃试验条件下,镀锌钢在模拟地热水中的表面电位较正,镀锌层失去阴极保护作用,从而加速了钢铁的腐蚀.
碳钢
镀锌钢
腐蚀
结垢
geothermal water
carbon steel
galvanized pipe
corrosion
scaling
Abstract
Corrosion and scaling are common troubles in geothermal application.The geothermal water of a central plain region was simulated to examine its scaling trends as well as the corrosion and scaling behavior of 20# carbon steel and galvanized steel pipe at 50 ℃,65 ℃ and 80 ℃.The results showed that the corrosion products and scale formed on 20# carbon steel pipe surface were loose,leading to a fast corrosion rate,while the rust and scale formed on galvanized steel pipe surface were condensed,which could effectively reduce the corrosion rate in geothermal water at 50 ℃ and 65 ℃.Under the test condition at 80 ℃,the surface potential of galvanized steel pipes was more positive,the zinc film lost its cathodic protection role,thus accelerated the corrosion.
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 2008/8/27
修改稿日期 2008/9/6
网络出版日期
作者单位点击查看
备注蔡培培,硕士研究生.
引用该论文: CAI Pei-pei,LI Wei-ping,CHEN Yi-chi,ZHU Li-qun,HU Wei. Corrosion and Scaling on Carbon Steel and Galvanized Steel Pipe in Simulated Geothermal Water[J]. Corrosion & Protection, 2009, 30(7): 454～458
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参考文献
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【3】G Pgtzay,G Stahl,F H Karman,et al.Modeling of scale formation and corrosion from geothermal water[J].Electrochimica Acta,1998,43:137-147.
【4】朱立群,山丹丹,赵 波.动态热海水中碳钢材料缓蚀剂的研究[J].材料科学与工艺,2007,15(5):631-635.
【5】赵金平,王心义,韩鹏飞,等.河南省东部平原地热水结垢与腐蚀评价及防护技术的研究[J].福州大学学报(自然科学版),2004,32(1):118-122.
【6】曹宗仑,陈进富,刘亚,等.油田采出水中成垢物质CaSO4·2H2O、CaCO3的溶解度[J].石油与天然气化工,2006,32(6):473-476.
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【10】周韬,施周,方伟,等.输配水镀锌钢管内壁腐蚀瘤物化特性研究[J].南华大学学报(自然科学版),2006,20(3):8-11.
【11】张蓉台.温泉水输送管材的选择[J].给水排水,2005,31(12):87-90.
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