摘要
通过浸提方式得到的蜈蚣草提取物(PVE)作为金属缓蚀剂,利用电化学方法研究了其对Q235钢在1 mol·L^(-1)盐酸溶液中的缓蚀性能。极化曲线结果表明,PVE对钢腐蚀反应有明显抑制作用,属于混合型缓蚀剂,缓蚀效率随浓度增大而增强;电化学阻抗图谱结果说明PVE分子通过吸附改变了金属表面双电层结构,增大了腐蚀反应的阻抗。吸附行为研究表明PVE分子在钢表面的吸附符合Langmuir单分子层吸附模型,平均每个提取物分子的吸附会导致3个以上水分子从钢表面脱附,且其吸附分子间存在斥力作用。
Pteris vittata extractive(PVE)achieved by immersion was investigated as a corrosion inhibitor for Q235 steel in 1 mol·L^(-1) HCl solution by means of the electrochemical methods. Polarization curves results indicated that PVE behaved as an effective mixed-type inhibitor in control of steel corrosion,and the inhibition performance of PVE on Q235 steel was found to be enhanced with the increasing PVE concentration.The analysis of electrochemical impedance spectroscopy implied that the increase of charge transfer resistance of corrosion reaction and the change of the structure of the electric double layer,due to the adsorption of PVE molecules on steel surface. Adsorption behavior studies have shown that the adsorption of PVE molecules conforms to the Langmuir monolayer adsorption model. On average,the adsorption of each extractive molecule will cause more than 3 water molecules to desorb from the steel surface,and there is a repulsive effect among the adsorbed molecules.
作者
陈文
Wen Chen(School of Resources,Environment and Chemistry,Chuxiong Normal University,Chuxiong 675000)
出处
《楚雄师范学院学报》
2022年第3期45-52,共8页
Journal of Chuxiong Normal University
基金
Supported by the National Natural Science Foundation of China (No. 2019J0401)。
关键词
Q235钢
盐酸
蜈蚣草提取物
吸附
缓蚀
Q235 steel
hydrochloric acid
Pteris vittata extractive
adsorption
inhibition
