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Coatings 2015, 5(2), 124-141; doi:10.3390/coatings5020124

Influence of Experimental Parameters Using the Dip-Coating Method on the Barrier Performance of Hybrid Sol-Gel Coatings in Strong Alkaline Environments

1
LNEC, Laboratório Nacional de Engenharia Civil, Av. Brasil 101, 1700-066 Lisboa, Portugal
2
Centro de Química, Universidade do Minho, Campus de Gualtar 4710-057 Braga, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Alessandro Lavacchi
Received: 20 March 2015 / Revised: 16 April 2015 / Accepted: 21 April 2015 / Published: 30 April 2015
(This article belongs to the Special Issue Trends in Coatings and Surface Technology—Feature Papers)
View Full-Text   |   Download PDF [2039 KB, uploaded 30 April 2015]   |  

Abstract

Previous studies have shown that the barrier effect and the performance of organic-inorganic hybrid (OIH) sol-gel coatings are highly dependent on the coating deposition method as well as on the processing conditions. However, studies on how the coating deposition method influences the barrier properties in alkaline environments are scarce. The aim of this experimental research was to study the influence of experimental parameters using the dip-coating method on the barrier performance of an OIH sol-gel coating in contact with simulated concrete pore solutions (SCPS). The influence of residence time (Rt), a curing step between each dip step and the number of layers of sol-gel OIH films deposited on hot-dip galvanized steel to prevent corrosion in highly alkaline environments was studied. The barrier performance of these OIH sol-gel coatings, named U(400), was assessed in the first instants of contact with SCPS, using electrochemical impedance spectroscopy and potentiodynamic methods. The durability and stability of the OIH coatings in SCPS was monitored during eight days by macrocell current density. The morphological characterization of the surface was performed by Scanning Electronic Microscopy before and after exposure to SCPS. Glow Discharge Optical Emission Spectroscopy was used to investigate the thickness of the U(400) sol-gel coatings as a function of the number of layers deposited with and without Rt in the coatings thickness. View Full-Text
Keywords: sol-gel; organic-inorganic hybrid; corrosion; coatings; dipping sol-gel; organic-inorganic hybrid; corrosion; coatings; dipping
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Figueira, R.B.; Silva, C.J.R.; Pereira, E.V. Influence of Experimental Parameters Using the Dip-Coating Method on the Barrier Performance of Hybrid Sol-Gel Coatings in Strong Alkaline Environments. Coatings 2015, 5, 124-141.

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