【摘要】 采用极化曲线法和电化学阻抗谱研究了缓蚀剂硫脲(TU)对X70钢在含H2S薄层液膜下的缓蚀作用。结果表明,在含H2S薄层液膜下,TU对X70钢有一定的缓蚀作用;TU属于以抑制阴极过程为主的缓蚀剂,TU的缓蚀性能随其浓度的增加而增加,当TU浓度为10mg/L时达到最大值;TU浓度进一步增加,缓蚀率减小。TU在X70钢表面为化学吸附,通过氮或硫原子上的孤对电子与表面铁发生键合而化学吸附在钢表面,从而对X70钢产生缓蚀作用。更多还原

【Abstract】 The inhibition effect of thiourea(TU)on corrosion of X70 steel under thin layer of electrolyte containing hydrogen sulfide was investigated by means of polarization curves and electrochemical impedance spectroscopy.The results indicated that under thin layer of electrolyte containing hydrogen sulfide,TU showed inhibition effect on the steel.TU is a corrosion inhibitor which mainly restraines the cathodic process.The inhibition efficiency increased with increasing the concentration of the inhibitor.When the concentration of TU was 10 mg/L,the inhibition efficiency was optimum.When the concentration of TU further increased,the inhibition efficiency decreased.The inhibition effect of TU on X70 steel corrosion results from chemical adsorption of TU through its isolated electrons from N or S on steel surface.更多还原