Preparation Of Triazinedithiol Polymeric Nanofilm On Aluminum Surface By Potentiostatic Polymerization Technique

Adsorption and polymerization of triazinedithiols (TDTs) on metal surfaces have been receiving considerable attention because of their anticorrosion property, adhesion property, lubrication property, dielectric property and superhydrophobic property on a variety of metal substrates. Monomer layer of TDTs on metal surfaces can be polymerized photochemically, thermochemically, electrochemically or evaporatingly. The electropolymerization process offers the advantage of simultaneous formation and deposition of the polymer coatings on metal substrate from monomer-electrolyte solution. Triazinedithiol polymeric nanofilm could be prepared by cyclic voltammetry and galvanostatic polymerization technique in the previous studies. These electrochemical methods had been studied systematically. However, the polymeric nanofilms obtained by the above techniques could not meet our need since they are too thin to apply in more fields.In this paper, the triazinedithiol nano polymeric film was prepared on pure aluminum surface by one-step and two-step potentiostatic electrochemical polymerization. Electronic balance was used to examine the polymeric film weight before and after electrochemical polymerization. Polymeric film thickness was measured by ellipsometer. The chemical structure of nanofilm was characterized by Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS).The results of one-step experiment showed that the optimal electrochemical polymerization potential and time were 8V and 20 seconds, respectively. Uniform and compact nanofilm of PAF17 could be obtained under these conditions. The results of two-step experiment one showed that the optimal electrochemical polymerization process of the two-step process was firstly polymerized at 1.6V for 60s, then at 10.0V for 30s and the optimal electrochemical polymerization temperature was 10℃. Uniform and dense nanofilm of PDH nanofilm can be obtained under these conditions. Mechanism of the process was also proposed.