Characterization of Polyorganosilazane-Derived Hybrid Coatings for the Corrosion Protection of Mild Steel in Chloride Solution

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.

Corrosion Assessment of Zn-Rich Epoxy Primers With Carbon Nanotube Additions in an Electrolyte With a Bacteria Consortium

“…These coatings are synthetized using organic, inorganic, and hybrid approaches. Organic coatings have been demonstrated to provide an effective physical barrier in a variety of aggressive conditions (Deflorian et al, 2005;Abdolahi et al, 2014;Fedel et al, 2019). However, when exposed to anoxic conditions such as those prevailing in seawater or oil and gas pipelines, some of these coatings degrade faster upon exposure to either a bacterial consortium or a specific strain of microbial attack (Enning and Garrelfs, 2014).…”

Process Parameter Optimization of a Polymer Derived Ceramic Coatings for Producing Ultra-High Gas Barrier

“…For this purpose, Perhydropolysilazane is being extensively reported in the research as an alternative route for the production of homogeneous, dense, and defect-free silica films from polymeric precursors using simple and economical solution processing techniques [18,19]. A polymer called Perhydropolysilazanes (PHPS) is an inorganic material that consists of silicon and nitrogen atoms in its backbone (-SiH 2 -NH-) and is being used frequently in recent times to produce silica coatings [20,21]. In favorable conditions, perhydropolysilazane produces a homogenous and dense SiO 2 structure, which has a basic characteristic of being impermeable to environmental gases especially moisture and oxygen [22,23].…”

Special Issue: “Advanced Hybrid Coatings and Thin Films for Surface Functionalization”

“…Two further works [8,9] show two interesting aspects of the research and innovation developments in a very promising and developing technological sector: the hybrid coatings world.…”

“…The seven papers composing the Special Issue [5][6][7][8][9][10][11] offer an interesting and wide window of the developments of functionalized hybrid coatings and thin films, from various and differentiated points of view.…”

“…The development of new polyorganosilazane-based hybrid coatings for the corrosion protection of ferrous substrates is described in the work of Fedel et al [8]. The work of Ortelli et al [9] describes an interesting development of hybrid coatings in a completely different sector, the textile one, with particular attention to the properties of thermal insulation and water resistance.…”