水溶性丙烯酰胺共聚物的缓蚀性能

Corrosion Inhibition of Soluble Acrylamide Copolymer

采用失重法、电化学方法以及表面分析手段研究了水溶性良好的丙烯酰胺(AM)和2-丙烯酰胺-2-甲基丙磺酸(AMPS)的共聚物(PAA)对Q235钢在1mol/L盐酸溶液中的缓蚀性能。结果表明:PAA对碳钢的腐蚀具有良好的抑制作用,缓蚀率随着PAA加入量的增加而增大,当PAA加入量为500mg/L时,缓蚀率能达到91%。PAA是一种混合抑制型缓蚀剂,同时具有非常优良的后效性。缓蚀剂分子可以吸附在金属表面,形成一层疏水性的保护膜,从而起到减缓腐蚀的作用,吸附行为符合Langmuir吸附等温式。

The corrosion inhibition of soluble poly （acrylamide-2-acrylamide-2-methyl propane sulfonic acid） （PAA） for Q235 steel in 1 mol/L HCL solution was evaluated by weight-loss method, electrochemical method and morphology characterization methods. The results showed that PAA had good corrosion inhibition, and the corrosion rate increased with the increase of PAA. When the content of inhibitor was 500 mg/L, corrosion inhibition efficiency could reach up to 91%. P.hA acted as a mixed-type corrosion inhibitor, in the meanwhile, it had excellent aftereffect. The corrosion inhibitor molecules could be adsorbed on the metal surface, forming a hydrophobic layer of protective film, so as to slow down the metal corrosion. The adsorption of inhibitor molecular on the metal surface was in line with the Langmuir adsorption isotherm.