应用极化曲线和交流阻抗技术研究了磷酸环己胺在Na_2SO_4溶液中的缓蚀机理及其吸附与脱附行为。结果表明,磷酸环己胺是一种负催化效应作用机理的阳极型缓蚀剂。它在铁电极上的吸附等温式符合Temkin模型。由于缓蚀剂的吸附与脱附作用,其阴极极化曲线存在着氧扩散极限电流区、强吸附区和Tafel线性区,而阳极极化曲线存在着Tafel线性区、脱附区和无缓蚀区。阳极脱附对于C_d、R_t等阻抗参数有显著影响。缓蚀剂浓度与吸附电位和脱附电位之间存在着良好的线性关系,但对吸附电位范围却无甚影响。
The inhibition mechanism and adsorption/desorption behavior of cyclohexylamine phosphate (PCA) in Na2SO4 solution were studied by electrochemical techniques. Clearly the inhibition of PCA was due to negative catalytic effect, which mainly affected the anodic reaction. Its adsorption obeyed the Temkin isotherm. There were oxygen diffusion part, strong adsorption part and Tafel linear part on the cathodic polarization curves and Tafel linear part, desorption part and non-inhibition part on anodic curves. There was a linear relationship between PCA concentration and the adsorption and desorption potential, but the PCA concentration had no effect on the range of adsorption potential.
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