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利用腐蚀速率失重法、扫描电镜(SEM)、能谱(EDS)以及电化学测试技术,研究了Q345钢在被重金属铬污染土壤溶液中的腐蚀行为。研究表明:Q345钢在原状土壤溶液中浸泡2周后的腐蚀程度明显比在铬污染的土壤溶液中严重,试样整个表面被腐蚀产物覆盖,而在铬污染的土壤中其表面光亮可鉴;去除腐蚀产物后观察试样的微观形貌发现,试样在原状土壤中为全面腐蚀,而在铬污染的土壤中部分区域出现点蚀坑。电化学测试结果表明:电荷转移电阻和自腐蚀电流密度均随铬质量分数的增加而逐渐降低。这说明试样在铬污染土壤中其表面形成了一层钝化膜,对基体起到保护作用,从而减缓Q345钢的土壤腐蚀。
Corrosion behavior of Q345 steel in soil contaminated with heavy metal chromium was studied by corrosion rate weight loss method, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and electrochemical measurement techniques. The results show that the corrosion of Q345 steel in soaking soil solution for 2 weeks is obviously more serious than that in chromium - contaminated soil solution. The entire surface of the sample is covered by the corrosion products while the surface is bright in chromium contaminated soil. After removing the corrosion products, the microstructure of the samples was observed. The samples were found to be completely corroded in the undisturbed soil, while pits were found in some areas of the chromium contaminated soil. The results of electrochemical tests show that the charge transfer resistance and self-corrosion current density decrease with the increase of chromium content. This indicates that the sample forms a passivation film on the surface of the chromium contaminated soil and plays a protective role on the substrate, thereby alleviating the soil erosion of the Q345 steel.