六次甲基四胺与羧甲基纤维素钠的缓蚀协同效应研究

Synergistic Corrosion Inhibition Effect of Hexamethylenetetramine and Carboxymethylcellulose Sodium

通过失重法研究了六次甲基四胺(HMTA)的缓蚀效率与其浓度的关系,采用失重法、极化曲线法和电化学阻抗谱法(EIS)研究了HMTA与羧甲基纤维素钠(CMC)的缓蚀协同效应,并探讨了缓蚀机理。结果表明,单一HMTA在0.5 mol/L硫酸溶液中对Q235钢有一定的缓蚀作用,但当HMTA与CMC复配后,缓蚀效率显著增大,最高可达91.63%,表现出良好的缓蚀协同效应。复配缓蚀剂是一种以控制阴极析氢过程为主的混合型缓蚀剂,通过在Q235钢表面产生自发吸附作用而抑制腐蚀,且CMC在Q235钢表面的吸附满足Langmuir等温模型,其吸附平衡常数为84.027 L/g。

The synergistic corrosion inhibition effect of hexamethylenetetramine（HMTA） and carboxymethylcellulose sodium（CMC） on Q235 steel in 0.5 mol/L H2SO4 solution was studied by means of weight loss and polarization curve measurements and electrical impedance spectroscopy（EIS）, while the mechanism of the synergistic corrosion inhibition effect was also discussed. Results showed that the HMTA has a certain inhibition effect for Q235 steel in 0.5 mol/L H2SO4 solution. However, the inhibition efficiency increased significantly when HMTA was compounded with CMC, which can be up to 91.63%. The compound inhibitor was a mix-type inhibitor presenting great restraint action on cathodic hydrogen evolution and retarding the corrosion through spontaneous adsorption on the surface of Q235 steel. In addition, the adsorption of CMC on the Q235 steel surface followed the Langmuir adsorption model, and the adsorption equilibrium constant was 84.027 L/g.