硫酸溶液中聚天冬氨酸对碳钢的吸附缓蚀性能

电化学（中英文） ›› 2005, Vol. 11 ›› Issue (3): 294-297.

硫酸溶液中聚天冬氨酸对碳钢的吸附缓蚀性能

崔荣静,谷宁,李春梅

河北师范大学化学学院,河北师范大学化学学院,河北师范大学化学学院河北石家庄050016 ,河北石家庄050016 ,河北石家庄050016

收稿日期:2005-08-28 修回日期:2005-08-28 出版日期:2005-08-28 发布日期:2005-08-28

Adsorption of Polyaspartic Acid from Sulphur Acid Solution on Carbon Steel and Its Corrosion Inhibition

CUI Rong-jing,GU Ning~*,LI Chun-mei

(College of Chemistry, Hebei Normal University, Shijiazhuang050016,China

Received:2005-08-28 Revised:2005-08-28 Published:2005-08-28 Online:2005-08-28

摘要/Abstract

摘要： 应用电化学极化曲线和交流阻抗研究聚天冬氨酸(PASP)对碳钢的缓蚀性能,讨论了PASP浓度和温度对缓蚀效果的影响.结果表明:PASP是一种以抑制阳极为主的缓蚀剂.在实验温度范围内,PASP在0.5mol/L硫酸溶液中对碳钢的缓蚀效率随着温度升高而降低,并以10℃时的缓蚀效果最好.在给定温度下,缓蚀率均随PASP浓度的增加而迅速增加,但当PASP质量浓度达到2.5g/L时,缓蚀率的增加趋于平缓,10℃下,缓蚀率的最高值可达80.33%(PASP 6.0g/L),PASP在碳钢表面的吸附基本服从Freund lich吸附等温式,PASP的加入增大了碳钢的腐蚀反应表观活化能.

关键词: 碳钢, 聚天冬氨酸, 绿色缓蚀剂, 电化学交流阻抗, 吸附等温线

Abstract: The role of Polyaspartic acid in the corrosion inhibition of 45~(#) carbon steel in sulphuric acid solution has been investigated by polarization curve andelectrochemical impedance spectroscopy (EIS). The influences of the concentration and the temperature of PASP on the corrosion inhibition efficiency were determined. The results indicated that the PASP as the corrosion inhibitor mainly inhibitated the anode; within the experiment temperature, the inhibitor efficiency decreased with the raising of the temperature and PASP had a good inhibiting performance at 10℃, the corrosion inhibition efficiency of PASP for carbon steel increased with the increase of the concentration of PASP when its concentration was lower than 2.5g L~(-1)and became constant approximately when its concentration was higher than 2.5g L~(-1),the maximum inhibitor efficiencywas 80.33%at 10℃;The adsorption behavior of PASP on the carbon steel surface followed a Freundlich-type isotherm; The adding ofPASP increased the activation energy of the corrosion reaction of carbon steel.

Key words: Carbon steel, Polyaspartic acid, Green corrosion inhibition, Electrochemical impedance spectroscopy, Absorption isotherm

中图分类号:

TG174

崔荣静,谷宁,李春梅. 硫酸溶液中聚天冬氨酸对碳钢的吸附缓蚀性能[J]. 电化学（中英文）, 2005, 11(3): 294-297.

CUI Rong-jing,GU Ning~*,LI Chun-mei. Adsorption of Polyaspartic Acid from Sulphur Acid Solution on Carbon Steel and Its Corrosion Inhibition[J]. Journal of Electrochemistry, 2005, 11(3): 294-297.

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