酸性土壤中模拟硝酸型酸雨作用下X70钢的腐蚀行为  

CORROSION BEHAVIOUR OF X70 STEEL IN SIMULATED NITRIC ACID RAIN IN ACID SOIL

作　　者：许进[1] 王海峰 王欣[3] 孙成[1] 王福会[1] 于长坤[1] 

机构地区：[1]中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016 [2]青海盐湖钾肥股份有限公司,格尔木816000 [3]沈阳广播电视大学理工学院生化系,沈阳110003

出　　处：《中国腐蚀与防护学报》2009年第5期376-381,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金面上项目(50671112);科技部国家科技基础平台项目(2005DKA10400-CT-2-02)资助

摘　　要：采用极化曲线、电化学阻抗谱、X射线衍射分析(XRD)及扫描电子显微镜(SEM)等方法,研究酸性土壤中不同pH值模拟硝酸型酸雨对X70钢腐蚀行为的影响。结果表明,酸性土壤中模拟硝酸型酸雨对埋地X70钢的腐蚀起加速作用;XRD结果表明X70钢表面的腐蚀产物主要由Fe_2O_3和SiO_2组成;SEM分析表明随着淋溶液pH值的升高试样表面粗糙度逐级降低,气孔数量逐渐减少。The effects of simulated nitric acid rain in different pH value on X70 steel in acidic soil were studied by means of polarization curves, electrochemical impedance spectroscopy（eis）, x-ray diffraction（xrd）, scanning electron microscopy（sem） etc. The results revealed that simulated acid rain could heavily increase the corrosion rate of X70 buried; The results of X-ray showed that corrosion products mainly consist of Fe2O3, SiO2; The results of SEM showed that with the increasing of pH value surface roughness was falling and quantities of microspores decreasing.

关 键 词：酸性土壤 模拟硝酸型酸雨 X70钢 

分 类 号：TG174.3[金属学及工艺—金属表面处理]