桐油酸咪唑啉衍生物的合成及其缓蚀性能

Synthesis of Eleostearic Acid Imidazoline Derivative and Evaluation of Its Corrosion Inhibition Performance

桐油能自干成膜但水溶性差,在缓蚀剂中的应用有局限性。为此,以桐油为原料合成了桐油酸,将其与二乙烯三胺反应后,产物再与甲基丙烯酸甲酯反应制成桐油酸咪唑啉衍生物,利用红外光谱分析了合成产物的分子结构,利用失重法和动电位极化曲线考察了合成产物在盐酸溶液中对N80钢的缓蚀性能。结果表明:合成的桐油酸咪唑啉衍生物为以阴极抑制为主的混合型缓蚀剂,能有效抑制N80钢在盐酸介质中的腐蚀;随着桐油酸咪唑啉衍生物浓度的增大以及腐蚀介质温度和浓度的降低,N80钢的腐蚀速率下降,缓蚀效率上升。

Tung oil was used as raw material to synthesize eleostearic acid.As-synthesized eleostearic acid was allowed to react with diethylenetriamine,and relevant synthesized product was finally allowed to react with methyl methacrylate to yield eleostearic acid imidazoline derivative.The molecular structure of the synthesized derivative was characterized by Fourier transform infrared spectrometry,and its corrosion inhibition performance for N80 steel in HCl solution was investigated based on weight loss test and potentiodynamic polarization curve measurement.It was found that as-synthesized eleostearic acid imidazoline derivative was able to effectively inhibit the corrosion of N80 steel in HCl solution,and it was a kind of mixed type inhibitor with capability to retard the cathodic reaction of N80 steel.Moreover,the corrosion rate of N80 steel increased with increased concentration of as-synthesized eleostearic acid imidazoline deri-vative as well as with decreased temperature and concentration of corrosive medium HCl,while the corrosion inhibition efficiency of the inhibitor increased therewith.