摘要
目前,国内鲜见关于Q235钢在直流杂散电流和酸性土壤联合作用下腐蚀行为的报道。通过失重法、电化学阻抗谱、显微镜、扫描电镜和X射线衍射法等,研究了直流杂散电流大小对Q235钢在含水率为30%和40%的鹰潭酸性土壤中腐蚀特性的影响。结果表明:土壤含水率和直流杂散电流对Q235钢的腐蚀行为有较强影响,其表面呈现局部腐蚀,电化学阻抗(EIS)谱为偏心的半圆;土壤的含水率相同时,EIS谱的容抗弧随着直流杂散电流的增加而减小,腐蚀速率和最大点蚀深度随着直流杂散电流的增加而增大;Q235钢在含水率为30%的土壤中的腐蚀快于在含水率为40%的土壤中的。
The influence of DC stray current on corrosion behavior of Q235 steel in Yingtan acid soil with 30% and 40% moisture content was investigated by means of mass lossmeasurement,electrochemical impedance spectroscopy( EIS),microscope and X- ray diffraction analysis( XRD). Results showed that the corrosion behavior of Q235 steel was strongly dependent on the moisture content and DC stray current in acid soil. Local corrosion occurred on the surface of Q235 steel and EIS spectrum was an eccentric semicircle. Under the same moisture content in the acid soil,the EIS capacitive loop of Q235 steel was shrinked while the mass loss rate and maximum pit corrosion depth were increased with the increase of DC stray current. The corrosion rate of Q235 steel in the acid soil with 30% moisture was quicker than that in the acid soil with 40% moisture.
出处
《材料保护》
CAS
CSCD
北大核心
2015年第9期14-17,6-7,共4页
Materials Protection
