采用电化学方法,研究了L-苯丙氨酸对Q235钢在0.5mol/LH2SO4 溶液中的缓蚀作用及缓蚀机理,分析了其缓蚀剂类型。结果表明:L-苯丙氨酸的缓蚀效率随浓度的增加而增大,而且随着温度的升高,Q235钢表面单个活性位点上吸附的缓蚀剂分子数量增加,缓蚀效率也增大;L-苯丙氨酸属于混合抑制型缓蚀剂,作用机理为几何覆盖效应,其在Q235钢表面的吸附为单分子吸附,且吸附规律符合El-Awady动力学模型。

The corrosion inhibition performance and inhibition mechanism of L-phenylalanine(LPHA) for Q235 steel in 0.5mol/L H2SO4 solutions were evaluated using electrochemical methods. The corrosion inhibitor type was analyzed. The results indicated that the inhibition efficiency of LPHA for Q235 steel in 0.5 mol/L H2SO4 solutions increased with increasing the concentration of LPHA,and with increasing temperature, due to the increase of the number of inhibitor molecules adsorbed on one active site,the inhibition efficiency increased; LPHA was a mixed-type inhibitor and the inhibition mechanism of which was coverage effect. The adsorption of LPHA on the surface of Q235 steel was monolayer adsorption and conformed with El-Awa dydynamic model.