核桃青皮提取物对冷轧钢在一氯乙酸中的缓蚀性能研究  

Corrosion inhibition of green Walnut Husk extracts on cold rolled steel in monochloroacetic acid

作　　者：雷然 秦浩然 李向红 LEI Ran;QIN Hao-ran;LI Xiang-hong(College of Chemical Engineering,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]西南林业大学化学工程学院,云南昆明650224

出　　处：《现代化工》2021年第6期114-118,共5页Modern Chemical Industry

基　　金：国家自然科学基金(51761036);国家级及云南省大学生创新创业训练计划项目(201910677014);云南省万人计划“青年拔尖人才”专项(51900109);云南省基础研究计划杰出青年项目(202001AV070008)。

摘　　要：利用失重法、电化学法、扫描电子显微镜(SEM)研究了0.5 mol/L一氯乙酸溶液中核桃青皮提取物(WGHE)对冷轧钢的缓蚀性能。结果表明,WGHE具有显著的腐蚀抑制作用,当WGHE质量浓度为100 mg/L时,20、30、40、50℃下缓蚀率(ηw)分别达到89.6%、92.0%、93.4%和93.2%;电化学极化曲线分析表明,阴极和阳极极化曲线均向腐蚀电流小的方向移动,表明WGHE为混合抑制型缓蚀剂;Nyquist图谱为单一压缩容抗弧,添加WGHE后,钢/酸界面的电荷转移电阻增大,腐蚀反应速率减缓;通过SEM形貌可观察到WGHE能有效降低一氯乙酸对冷轧钢表面的腐蚀。Corrosion inhibition performance of walnut green peel extracts(WGHE)for cold rolled steel(CRS)in a0.5 mol·L-1 monochloroacetic acid solution is investigated by means of weight loss,electrochemical methods and scanning electron microscope(SEM).The results show that WGHE has remarkable corrosion inhibition effect.When the concentration of WGHE is 100 mg·L-1,the inhibition efficiency(ηw)values are 89.6%,92.0%,93.4%and 93.2%at20℃,30℃,40℃and 50℃,respectively.From analysis on electrochemical polarization curves,both cathodic and anodic polarization curves shift to the direction of low corrosion current,indicating that WGHE is a mixed-type inhibitor.Nyquist pattern is a single depressed capacitive arc.With the addition of WGHE,the charge transference resistance increases,which leads to a slowed corrosion reaction rate.SEM morphologies confirm that the corrosion of CRS can effectively be retarded by WGHE.

关 键 词：核桃青皮提取物 冷轧钢 一氯乙酸 缓蚀 吸附 

分 类 号：TQ047.6[化学工程] TQ133.3