硫酸介质中缓蚀剂对碳钢腐蚀和缓蚀性能的研究
Corrosion and Corrosion Inhibition Performance of Carbon Steel in Sulfuric Acid Medium
孟亚鸽 1刘志红 1韩正伟 1赵辉1
作者信息
- 1. 贵州大学 矿业学院,贵州 贵阳550025;喀斯特地区优势矿产资源高效利用国家地方联合工程实验室,贵州 贵阳550025;贵州省非金属矿产资源综合利用重点实验室,贵州 贵阳550025
- 折叠
摘要
针对酸性介质中A3碳钢的腐蚀现象,考察了单一药剂和复配药剂在硫酸介质中的缓蚀性能,并以失重法、极化曲线法、电子扫描电镜法为表征.失重法得出L-甲硫氨酸的缓蚀性能高于L-半胱氨酸,且L-甲硫氨酸:碘化钾:Tween-80=500:50:6时,缓蚀性能最好,可达89.99％;极化曲线显示L-半胱氨酸和L-甲硫氨酸为以阳极为主的混合型缓蚀剂,其复配缓蚀剂主要为阳极缓蚀剂;电子扫描显微镜显示添加了缓蚀剂的硫酸中碳钢表面平整均匀,说明缓蚀剂分子在金属表面形成了一层保护膜,使得金属表面免受酸液的腐蚀.拟合吸附模型研究结果表明,L-甲硫氨酸和L-半胱氨酸都符合Langmuir等温吸附模型.
Abstract
For the corrosion behavior of A3 carbon steel in sulfuric acid medium, the inhibition performance of single reagent and compound reagent was investigated and characterized by weight loss method, polarization curve method and scanning electron microscopy ( SEM) . It is shown that weight loss method resulted in L-methionine better than L-cysteine in inhibition, with corrosion inhibition rate up to 89.99％ with the L-methionine:potassium iodide:Tween-80=500:50:6. Polarization curves show that L-cysteine and L-methionine are mixed anode-based corrosion inhibitors. The compound reagent is mainly an anode corrosion inhibitor. SEM shows that the carbon steel in the sulfuric acid with the corrosion inhibitor has a smooth and uniform surface, indicating that the corrosion inhibitor molecules have formed a protective film on the metal surface against acid corrosion. In addition, curve fitting for the adsorption models indicates that both L-methionine and L-cysteine conform to the Langmuir isothermal adsorption model.
关键词
腐蚀/缓蚀剂/A3碳钢/复配/吸附模型Key words
corrosion/corrosion inhibitor/A3 carbon steel/compound/adsorption model引用本文复制引用
基金项目
国家科技支撑计划(2013BAC15B01)
贵州大学研究生创新基金(院研20160107)
出版年
2017
NETL
NSTL
维普
万方数据