不锈钢供水管材的土壤外腐蚀特性试验
Experiment of Soil External Corrosion Characteristics for Stainless Steel Pipeline Materials of Water Supply
温朵 1李伟英 2宋欣 1迟冉 1熊清华 3罗晓静4
作者信息
- 1. 同济大学环境科学与工程学院,上海 200092
- 2. 同济大学环境科学与工程学院,上海 200092;同济大学长江水环境教育部重点实验室,上海 200092
- 3. 重庆邮电大学生命健康信息科学与工程学院,重庆 400065
- 4. 重庆交通大学河海学院,重庆 400074
- 折叠
摘要
摘 要 试验以砖红壤中Cl-和含水率为研究要素,借助电化学工作站,开展3种不锈钢供水管材(304、304L、316L)外腐蚀试验.结果表明:3种不锈钢在不同Cl-和含水率的砖红壤中均有不同程度腐蚀倾向(304＞304L＞316L);当砖红壤Cl-质量分数在10～1 250 mg/kg时,3种不锈钢腐蚀电流增幅(ΔIcorr低)较大,为304L＞316L＞304,当Cl-质量分数在1 250～2 500 mg/kg时,其ΔIcorr高较小,为304L＞304＞316L,即腐蚀减缓,Cl-在一定范围内促进不锈钢管材腐蚀.与此同时,当砖红壤含水率在5％～35％时,3种不锈钢ΔIcorr为 304L＞316L＞304,其中,当含水率在15％～25％时,其△Icorr中较大,为304L＞316L＞304,即腐蚀加快,含水率在一定范围内使不锈钢管材腐蚀加快.
Abstract
The chloride ion(Cl-)and moisture ofthe latosol were selected to investigatethe external corrosion behaviors of three types of stainless steel,304,304L,316L.The results revealed that 316L stainless steel exhibited strong resistance of environmental erosion,304L followed and 304 the worst in latosol no matter in the concentrations of Cl-and moisture.Particularly,when experimental latosol contained Cl-from 10 mg/kg to 1 250 mg/kg,the increments of corrosion current(ΔIcorr低)of the three types of stainless steel appeared obviously,where 304L＞316L＞304.When the concentration of Cl-varied from 1 250 mg/kg to 2 500 mg/kg,the relative lower increments of ΔIcorr高 were obtained,where 304L＞304＞316L,indicating that the soil environment with low Cl-promoted corrosion and high Cl-suppressed corrosion.Additionally,when the moisture of latosol was changed from 5％to 35％,the ΔIcorr values of three type stainless steel ordered by 304L＞316L＞304.When the moisture of soil increases from 15％to 25％,Icorr varied more obviously,and 304L＞316L＞304,indicating that moisture was conducive to improve corrosion progresses of the buried stainless steel under a certain range.
关键词
供水管道/不锈钢/土壤外腐蚀/动电位极化曲线/电化学阻抗谱Key words
water supply pipeline/stainless steel/soil external corrosion/potentiodynamic polarization curve/electrochemical impedance spectroscopy引用本文复制引用
基金项目
国家重点研发计划(十四五)(2021YFC3201304)
&&(kh0040020203000)
江苏银羊不锈钢管业有限公司企业项目(20202847)
出版年
2024
国家科技期刊平台
NSTL
万方数据