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Effect of surfactant concentration in modifying solution on corrosion properties of the coatings based on vinyltrimethoxysilane (VTMS) and poly(3,4-ethylenedioxythiophene) (PEDOT)

Kucharczyk A., Adamczyk Lidia, Miecznikowski K.

Archives of Materials Science and Engineering

2023

Vol. 121, nr 1

5--17

Purpose: This paper presents an analysis of the structure and physicochemical properties of coatings based on an organofunctional silane (VTMS), a conductive polymer (PEDOT), and a surfactant (polyoxyethylene glycol monolauryl ether BRIJ). Design/methodology/approach The coatings were deposited on X20Cr13 stainless steel and glassy carbon specimens using sol-gel immersion. The obtained coatings were characterised in terms of topography, microstructure, roughness, adhesion to the steel substrate, thickness, and corrosion resistance. Corrosion tests were conducted in sulfate environments with pH = 2 without or with the addition of Cl- ions. Findings: The use of different surfactant concentrations in the modifying solution is intended to improve the deposition efficiency and increase the degree of dispersion of silane and conducting polymer. Research limitations/implications The tested coatings were found to slow down the corrosion of the steel substrate, thus effectively protecting it from this phenomenon. The use of a surfactant compound is intended to increase the degree of dispersion of silane and polymer in the modifying solution to improve deposition efficiency. Practical implications: Test carried out in corrosive media have shown that the coatings proposed in the above work, based on VTMS silane, PEDOT polymer and BRIJ surfactant, significantly increase the corrosion resistance of the tested materials, which confirms their effectiveness and possibility of application in various industries. Originality/value: The novelty of this paper is the use of silane (VTMS), polymer (PEDOT) and surfactant (BRIJ) as components of the anticorrosion coating.

Wpływ stężenia BRJI na właściwości ochronne powłok silanowych na bazie winylotrójmetoksysilanu wytworzonych na stalach X20Cr13 i 41Cr4

Kucharczyk Aleksandra, Adamczyk Lidia

Ochrona przed Korozją

2022

nr 3

83--87

W niniejszej pracy zbadano właściwości ochronne powłok silanowych na bazie winylotrójmetoksysilanu VTMS i niejonowego środka powierzchniowo - czynnego BRJI. Jako rozpuszczalnik organosilanu i surfaktantu zastosowano etanol, natomiast kwas octowy zastosowano w celu ustalenia środowiska kwasowego (pH roztworów między 3−4). Powłoki naniesiono na próbki stali nierdzewnej X20Cr13 oraz stali stopowej konstrukcyjnej 41Cr4 metodą zanurzeniową w procesie sol-gel przy użyciu różnych stężeń surfaktantu. Otrzymane powłoki scharakteryzowano pod względem odporności korozyjnej, przyczepności do podłoża stalowego oraz grubości. Badania korozyjne przeprowadzono w kwaśnych środowiskach siarczanowych o pH = 2 bez lub z jonami Cl-. Zastosowanie związków powierzchnio–czynnych ma za zadanie zwiększenie stopnia zdyspergowania silanu w roztworze modyfikującym, celem poprawy efektywności procesu osadzania.

In this study, the protective properties of silane coatings based on VTMS vinyltrimethoxysilane and BRJI non-ionic surfactant were investigated. Ethanol was used as the solvent for organosilane and surfactant, while acetic acid was used to adjust the acidic environment (pH of the solutions between 3-4). The coatings were applied to samples of X20Cr13 stainless steel and 41Cr4 structural alloy steel by dip method in the sol-gel process using various surfactant concentrations. The obtained coatings were characterized in terms of corrosion resistance, adhesion to the steel substrate and thickness. Corrosion tests were carried out in acidic sulphate media with pH = 2 without or with Cl- ions. The purpose of the use of surfactants is to increase the degree of silane dispersion in the modifying solution in order to improve the efficiency of the deposition process.