不同湿度的酸性红壤中Q235钢-紫铜电偶腐蚀行为研究

发布时间：2018-08-12 16:19

【摘要】：目的研究典型江西酸性红壤环境中,不同土壤含水量对Q235钢-紫铜电偶腐蚀行为的影响。方法将Q235钢-紫铜偶接后置于不同湿度的红壤中,采用ZRA-2型电偶腐蚀计测量电偶电流和电偶电位。每间隔一定时间取出样品称重,获得腐蚀动力学曲线。采用XRD、SEM和EDS分析腐蚀产物形貌、成分和物相组成。结果腐蚀产物主要为Fe_3O_4、Fe_2O_3和FeOOH。随着土壤含水量增加,腐蚀产物剥落越严重,样品腐蚀失重越明显。Q235钢与紫铜偶接后,电偶腐蚀效应导致碳钢腐蚀加速。土壤含水量(质量分数)分别为10%、20%和30%时,电偶腐蚀效应分别为5.70、4.30和4.08。腐蚀初期,由于表面生成腐蚀产物,电偶电流出现急剧降低。结论随着土壤含水量增加,电偶电流增加,腐蚀越严重。
[Abstract]:Objective to study the effect of soil moisture content on galvanic corrosion behavior of Q235 steel and copper in typical Jiangxi acid red soil environment. Methods Q235 steel and copper were coupled in red soil with different humidity. The galvanic current and electric coupling potential were measured by ZRA-2 galvanometer. The corrosion kinetics curve was obtained by taking out the weight of the sample at certain intervals. The morphology, composition and phase composition of the corrosion products were analyzed by XRDA SEM and EDS. Results the corrosion products were mainly FeSZ _ 3O _ s _ 4 and Fe _ 2O _ 2O _ s _ 3 and FeOOHs. With the increase of soil water content, the more serious the exfoliation of corrosion products is, the more obvious the corrosion loss of sample is. Q235 steel is coupled with copper, and the galvanic corrosion effect leads to the accelerated corrosion of carbon steel. When the soil moisture content (mass fraction) was 10% and 30%, the galvanic corrosion effect was 5.704.30 and 4.08, respectively. At the beginning of corrosion, the galvanic current decreased sharply due to the formation of corrosion products on the surface. Conclusion with the increase of soil moisture content, the galvanic current increases and the corrosion becomes more serious.
【作者单位】：国网江西省电力公司电力科学研究院;南昌航空大学材料科学与工程学院;
【分类号】：TG172.4

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