Evaluation of the Corrosion Inhibition Performance of Silane Coatings Filled with Cerium Salt-Activated Nanoparticles on Hot-Dip Galvanized Steel Substrates

摘要

The present work investigates the morphological and electrochemical behavior of hot-dip galvanized(HDG) steel substrates that were pre-treated with 3-glycidoxypropyltrimethoxysilane (GPTMS) andbisphenol A (BPA) modified with cerium ion-activated CeO2 nanoparticles. The morphology of thecoatings before and after the corrosion test was examined using atomic force microscopy (AFM) andscanning electron microscopy (SEM). The results indicated the formation of a comparatively smooth,nanostructured surface, with a small heterogeneity in the coating thickness. Microscopic observationsalso confirmed that the integral surface morphology of the silane coating filled with activated CeO2nanoparticles was maintained after short-term corrosion tests (144 h). The corrosion behavior of thesolel coatings was investigated using natural salt spray tests, electrochemical impedancespectroscopy (EIS), and potentiodynamic polarization tests. The results showed that the presence of thenanoparticles reinforced the barrier properties of the silane films, and a synergy seemed to be createdbetween the activated nanoparticles and the cerium ions, reducing the corrosion activity.