Corrosion protection by hydrophobic silica particle-polydimethylsiloxane composite coatings. (October 2015)

• Record Type: Journal Article
• Authors: Ejenstam, Lina; Swerin, Agne; Pan, Jinshan; Claesson, Per M.
• Is Part Of: Corrosion science. Volume 99(2015)
• Page Start: 89
• Page End: 97
• Publication Date: 2015-10
• Subjects: A. Carbon steel -- A. Organic coatings -- B. EIS -- B. Electrochemical calculation -- C. Polymer coatings; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2015.06.018
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: Corrosion protection of steel substrates is achieved by a one-layer organic coating. Corrosion protection during almost 80 days of exposure to 3 wt% NaCl solution. The corrosion protective properties depend on particle concentration. Increase in diffusion path and hydrophobicity can explain the good properties. Abstract: In this study, the time-dependent corrosion protection ability of 10–15 μm thin polydimethylsiloxane-nanoparticle composite coatings was evaluated using mainly open circuit potential and electrochemical impedance spectroscopy measurements. The best result was obtained for the coating containing 20 wt% hydrophobic silica nanoparticles, where it was possible to achieve protection for almost 80 days in 3 wt% NaCl solution. The protective properties offered by this coating are suggested to be due to a synergistic effect of the hydrophobicity of the polydimethylsiloxane matrix and the prolonged diffusion path caused by addition of hydrophobic silica particles.