HDT自组装膜对银的缓蚀作用

Corrosion Inhibition of Silver by HDT Self-assembled Monolayers

在乙醇溶液中使用十六硫醇(HDT)在银表面制备了自组装膜(SAMs),用极化曲线、反射率、EPMA、AFM、XPS等方法研究了HDT SAMs对银的缓蚀效果及吸附行为。结果表明,HDT能在银表面形成不影响外观、稳定致密的SAMs,有效抑制银的腐蚀。在浓度为0.05 mol/dm3的Na2S溶液中,当HDT浓度为0.1 mol/dm3时缓蚀效率达到91.7%,HDT是以阴极型为主的混合型缓蚀剂。HDT在银表面的吸附行为符合Langmuir吸附等温式,吸附过程包括物理吸附和化学吸附。

The self-assembled monolayers（SAMs） of hexadecane-thiol（HDT） were prepared on silver surface in ethanol solution. The adsorption behavior of HDT SAMs on silver surface and their corrosion inhibition were investigated by means of polarization curve, reflectance, EPMA, AFM and XPS. The results indicate that the HDT SAMs are dense and stable and do not affect the original appearance of silver, while exhibit also excellent inhibiting effect. In the solution with 0.05 mol/ dm3Na2 S, the inhibition efficiency is up to 91.7% for the HDT SAMs prepared in the ethanol solution with 0.1 mol/dm3 HDT. The polarization curve shows that HDT acts as a mixed type inhibitor with cathodic inhibition as dominative action. The adsorption of HDT on the silver surface obeys the Langmuir adsorption law and contains both physisorption and chemisorption.