盐酸溶液中dmit(Bu^n)_2对Q235钢的缓蚀性能研究  

Corrosion Inhibition of Q235 Steel in Hydrochloric Acid Solution by dmit(Bu^n)_2

作　　者：陈能[1] 谢斌[1,2] 邹立科[1,3,2] 卢燕[3] 朱莎莎[1] 何林芯[1] 

机构地区：[1]四川理工学院功能材料研究所,四川自贡643000 [2]材料腐蚀与防护四川省重点实验室,四川自贡643000 [3]四川理工学院化学与制药工程学院,四川自贡643000

出　　处：《四川理工学院学报（自然科学版）》2014年第4期16-20,共5页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：材料腐蚀与防护四川省重点实验室开放基金项目(2011CL03;2012CL12);四川省自贡市科技局科研项目(2012H04);四川理工学院研究生创新基金项目(2013026)

摘　　要：合成了有机硫化合物4,5-二(正丁硫基)-1,3-二硫杂环戊二烯-2-硫酮(dmit(Bun)2),用元素分析和红外光谱进行了表征,采用电化学极化曲线法研究了dmit(Bun)2在1.0 mol·L-1HCl溶液中对Q235钢的缓蚀作用,并考察了dmit(Bun)2浓度、HCl浓度、腐蚀体系温度、缓蚀液放置时间对缓蚀性能的影响。研究结果表明:在30℃时,dmit(Bun)2浓度为80 mg·L-1的1.0 mol·L-1HCl溶液中,缓蚀剂对Q235钢的缓蚀率达到了99.01%,dmit(Bun)2为混合型缓蚀剂。吸附拟合表明:dmit(Bun)2在Q235钢表面的吸附符合Langmuir吸附等温式,属于自发进行的化学吸附。dmit(Bun)2的缓蚀率随dmit(Bun)2浓度增大而升高,随腐蚀体系温度升高而降低,随HCl浓度增大而逐渐降低,随静置时间的延长、dmit(Bun)2的缓蚀性变化不大。A new organosulfur compound, 4,5-bis （butylthio） -1,3-dithiole-2-thione （ dmit （ Bun ） 2 ）, was synthesized and characterized by elemental analysis and infrared spectroscopy. The corrosion inhibition performance of dmit （Bun） 2 for Q235 steel in HCI solution was investigated by potentiodynamic polarization and scanning electron microscopic （SEM）. In addition, the effect factors of concentration of dmit （Bun） 2, concentration of HCI, the temperature of corrosion system and immersion time on corrosion behavior of Q235 steel in HCI solution were elaborately studied . The studies showed that the dmit（ Bun）2 is a mixed-type inhibitor. Meanwhile,the inhibition efficiency is up to 99. 01% for Q235 steel in 1.0 mol·L-1 HCI solution with 80 mg-Ll dmit （Bun）2 at 30 ℃. The adsorption of dmit （Bun）2 on Q235 steel surface obeys the Langmuir＇s isotherm, and the inhibition was spontaneous governed by chemisorption mechanism. The inhibition efficiency increases with inhibitor concentration and decreases with temperature and HC1 concentration, but the inhibition efficiency changes a little with immersion time.

关 键 词：dmit(Bun)2 缓蚀性 HCL溶液 Q235钢 

分 类 号：O614.121[理学—无机化学] O625.621[理学—化学]