CORROSION RESISTANCE OF HYBRID FILMS APPLIED ON TIN PLATE: PRECURSOR SOLUTION ACIDIFIED WITH HYDROCHLORIC ACID

摘要

The aim of this work is to coat tin plate with a hybrid film obtained from a sol consisting of alkoxide precursors: 3 - (trimethoxysilylpropyl) methacrylate (TMSM), poly (methyl methacrylate) PMMA with and without tetraethoxysilane (TEOS) addition. The pH = 3 was adjusted with hydrochloric acid. The films were obtained by dip-coating process, cured for 3 hours at 160 ℃, and characterized for their electrochemical behavior. The hydrophobicity of the film was determined by the contact angle measurements and its morphology was evaluated by SEM. Results showed that the hybrid films studied presented good performance concerning their corrosion resistance in tin plate. Besides the addition of TEOS, it has contributed to the increase of the film thickness, however at the same time promoting the crack formation, which compromises the corrosion resistance of the coated tin plate.