Abstract
Polysilazane (PSZ) have been used for many years as precursors for the development of ceramic materials. Recently, hydrocarbon-substituted polysilazane, which is called organopolysilazane (OPSZ), has been proposed as possible alternative to silanes for the corrosion protection of metals by the sol gel route. In this work, polymethyl(hydro)/polydimethylsilazane-derived coatings were deposited on low-carbon steel for corrosion protection purposes. The effect of the OPSZ precursor concentration (10–40 v/v %) in butyl-acetate on the final properties of the coatings was investigated. Coatings in the thickness range of 1 to 3.5 µm were obtained. The experimental results showed that the concentration of OPSZ in the solvent affects the structural properties as well as the dry film thickness of the hybrid layer. In particular, the network arrangement seems to be influenced by the dilution of the OPSZ precursors solution. The electrochemical characterization revealed that a minimum thickness of about 2 to 3 µm is needed to provide the mild steel substrate with enhanced corrosion protection properties compared to the bare substrate. Comparing the obtained results with literature data, it seems that OPSZs are a potential alternative to coatings derived from organisilicon precursors.
Highlights
Thin ceramic coatings have been extensively studied for the protection of steel against corrosion and degradation
The corrosion protection properties of the films were assessed by means of electrochemical techniques, such as polarization curves and electrochemical impedance spectroscopy (EIS)
The effect of the dilution in butyl-acetate on the final properties of hybrid coatings derived from polyorganosilazane precursors based on polymethyl-(hydro)/polydimethylsilazane was investigated for the corrosion protection of mild steel in a chloride medium
Summary
Thin ceramic coatings have been extensively studied for the protection of steel against corrosion and degradation. Due toN–H the high present in the OPSZ backbone, making these materials suitable to form a dense silica network reactivity of the Si–N, N–H, and Si–H bonds towards OH groups, OPSZs are recognized to be ableas to well adherent films diverseon substrates. As far as carbon steel is concerned as have the substrate toas coat, analogously to the hybrid organic-inorganic metal alkoxides precursors, OPSZs potential a metal pre-treatment prior to painting or as a coatings derived from metal alkoxides precursors, OPSZs have potential as a metal pre-treatment standalone protection system for mild environments This class of materials is not newprior and to as a standalone protectionnovel system for mild environments.polysilazane. NaCl. the condition of the surfaces after exposure to 0.1 M NaCl
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