模拟地热水温度对镀锌钢管腐蚀与结垢的影响  

Effect of temperature on corrosion and scaling of galvanized steel pipe in simulated geothermal water

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,北京100191

出　　处：《北京航空航天大学学报》2010年第10期1239-1243,共5页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家高技术研究发展计划资助项目(2007AA05Z441)

摘　　要：针对地热水环境中金属管道常见的腐蚀与结垢问题,采用扫描电子显微镜、能谱仪、X射线衍射仪等研究了不同温度的模拟地热水中镀锌钢管的腐蚀与结垢行为.结果表明:实验前期镀锌钢管的表面出现两种形貌("球"状和"针"状),不同温度的地热水中腐蚀与结垢产物的晶体形状不同,产物成分主要为Zn(OH)2,ZnO,CaCO3和MgCO3;镀锌钢管表面产物的分布对镀锌钢管在模拟地热水中的进一步腐蚀有一定程度的抑制;50℃地热水中的镀锌钢管表面的腐蚀坑面积较小,而在65℃和80℃地热水中腐蚀坑面积较大,镀锌钢管的腐蚀与结垢速度随地热水温度的升高而增大.Steel pipe corrosion and scaling is a universal problem in the geothermal water environment.Scanning electron microscopy（SEM）,energy dispersion spectrometry（EDS） and X-ray diffraction（XRD） were used to study the corrosion and scaling behavior of galvanized steel pipe in a simulated geothermal water environment with different temperatures.Results indicate that there are two kinds of microcosmic appearance（＂ball＂ like and ＂needle＂ like） on the surface of galvanized steel pipe in the forepart of experiment.The shape of corrosion and scaling crystals is different at different temperatures.The main components of corrosion and scaling products are Zn（OH）2,ZnO,CaCO3 and MgCO3,and they could restrain the further corrosion of galvanized steel pipe in the geothermal water.The area of corrosion pit of galvanized steel pipe is small at 50℃,and which is big at 65℃ and 80℃.The corrosion and scaling of galvanized steel pipe accelerates as the temperature increases.

关 键 词：地热水 镀锌钢管 温度 腐蚀 结垢 

分 类 号：TG172.5[金属学及工艺—金属表面处理]