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

作　　者：蔡培培[1] 李卫平[1] 陈贻炽[1] 朱立群[1] 胡伟[2] 

机构地区：[1]北京航空航天大学,材料科学与工程学院,北京100083 [2]中国人民解放军陆军航空兵学院机械系,北京100123

出　　处：《腐蚀与防护》2009年第7期454-458,共5页Corrosion & Protection

基　　金：国家863计划资助项目(2007AA05Z441)

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。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.

关 键 词：地热水 碳钢 镀锌钢 腐蚀 结垢 

分 类 号：TG172.5[金属学及工艺—金属表面处理]