不同湿度的酸性红壤中Q235钢-紫铜电偶腐蚀行为研究  

Galvanic Corrosion Behavior of Q235 Steel-Red Copper in Acid Red Soil of Different Water Content

作　　者：裴锋[1] 刘光明[2] 刘欣[1] 张诗雨[2] 田旭[1] 刘志雷[2] 李多生[2] 

机构地区：[1]国网江西省电力公司电力科学研究院,南昌330096 [2]南昌航空大学材料科学与工程学院,南昌330063

出　　处：《表面技术》2017年第8期240-245,共6页Surface Technology

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。The work aims to study the effects of different water content in soil on galvanic corrosion behavior of Q235 steel-red copper galvanic corrosion behavior in typical acid red soil environment in Jiangxi province. Q235 steel-red copper coupling was coupled and placed in red soil of different humidity. Galvanic current and potential were measured with ZRA-2 galvanometer. The sample was taken out from soil for weighing to obtain corrosion kinetic curve at selected time intervals. Mi- crostructure, composition and phase of the corrosion products were analyzed with X-ray diffractometer （XRD）, scanning elec- tron microscope （SEM） and energy dispersive spectroscope （EDS）, respectively. Main corrosion products were identified as Fe304, Fe203 and FeOOH. With the increase of water content in soil, corrosion products spallation became worse and corrosion weight loss was more significant. As Q235 steel and red copper were coupled, galvanic corrosion effect led to acceleration of carbon steel corrosion. The galvanic corrosion effect was 5.70, 4.30 and 4.08, respectively when water content in soil was 10%,20% and 30%, respectively. At the initial stage of corrosion, the galvanic current decreased dramatically since corrosion prod- ucts took shape on the sample surface. The galvanic current increases and the corrosion becomes worse as the water content in soilincreases

关 键 词：Q235钢 电偶腐蚀 含水量 酸性红壤 

分 类 号：TG172.4[金属学及工艺—金属表面处理]