采用化学氧化法合成了聚丙烯酸掺杂态聚苯胺(PANI); 采用傅立叶红外法(FTIR)对合成产物进行了表征; 采用电化学阻抗谱和动电位极化方法研究了PANI单独作用和复配时对Q235钢在0.5 mol ·L-1 HCl溶液中的缓蚀性能。结果表明, PANI单独作用时, 当用量为20 mg·L-1时缓蚀效率最高为73.6%; 将聚苯胺与聚丙烯酰胺、三乙醇胺、脲按质量比1∶2∶1∶1进行复配, 缓蚀效率大大提高, 复配缓蚀剂PANI浓度为80 mg·L-1时缓蚀效率达到92.7% 。复合缓蚀剂在Q235钢表面的吸附服从修正后的朗缪尔吸附等温式。

Polyaniline acid (PAAC) was chosen as doping acid to prepare polyaniline( PANI) by direct chemical oxidation. The results of FTIR absorption spectra were used to characterize the product. And the inhibition effects of single and compound PANI on corrosion of Q235 steel in 0.5 mol·L-1 HCl solution were investigated by polarization curvers and electrochemical impedance spectroscopy (EIS). The results showed that the corrosion inhibition performance of PANI alone was just average. When the concentration of PANI was 20 mg·L-1, the best inhibition efficiency was only 73.6%. Corrosion inhibition performance was better when polyaniline was compounded with polyacrylamide, triethanolamine and urea, with a mass ratio of 1∶2∶1∶1 . When the concentration of polypaniline was 80 mg·L-1, the inhibition efficiency reached 92.7%. Adsorption of polyaniline on Q235 steel obbeys the modified Langmuir adsorption isotherm.