摘要
为提高咪唑啉缓蚀剂的水溶性及缓蚀效率,以己二酸与二乙烯三胺为原料合成了带酰胺和咪唑啉基团的聚合型缓蚀剂PIM,以羟乙基乙二胺为原料合成了常见的非聚合型缓蚀剂UPIM;采用红外光谱和质谱测试了2种缓蚀剂的结构及分子量;采用交流阻抗法分析了2种缓蚀剂在N80钢表面的吸附性质,并拟合了表面覆盖率和时间的关系曲线;采用Tafel极化曲线法测试了不同浓度缓蚀剂对N80钢的缓蚀性能。结果表明:N80钢在含50mg/L PIM的0.5 mol/L H_2SO_4溶液中浸泡6 min后,覆盖率达到85.02%,高于UPIM;当0.5 mol/L H_2SO_4溶液中聚合型缓蚀剂PIM浓度为400 mg/L时,缓蚀率最高可达96.7%,明显高于缓蚀剂UPIM的;经过较长时间腐蚀后,聚合型缓蚀剂PIM在金属表面的吸附稳定性优于UPIM的。
Corrosion inhibitor PIM with groups of amide and imidazoline ring was synthesized with adipic acid and diethylenetriamine as raw material,and corrosion inhibitor UPIM was synthesized with β-hydroxyethylenediamine as raw material.The structure and molecular weight of PIM and UPIM were characterized by FTIR and MS.The adsorption and inhibition of PIM and UPIM were tested by EIS measurement,and the relation curve of surface coverage rate to time was fitted.Tafel polarization curves were measured to evaluate the corrosion inhibition of PIM and UPIM on N80 steel surface.Results showed that the coverage rate of PIM was 85.02%on the surface of N80 steel soaked in 50 mg/L PIM and 0.5 mol/L H_2SO_4solution for 6 min,and higher than that of UPIM.The inhibition efficiency of PIM reached 96.7%when PIM was 400 mg/L in 0.5 mol/L H_2SO_4solution,and apparently better than UPIM.With the increase of corrosion time,the adsorption stability of PIM on metal surface was better than that of UPIM.
出处
《材料保护》
CAS
CSCD
北大核心
2015年第11期52-55,43,共4页
Materials Protection
基金
江苏省科技厅政策引导类计划(产学研合作)--前瞻性联合研究项目(BY2015027-19)资助
关键词
N80钢
聚合型咪唑啉
缓蚀剂
交流阻抗法
吸附稳定性
缓蚀性能
N80 steel
poly-imidazoline
corrosion inhibitor
EIS method
adsorption stability
corrosion inhibition
