The Influence of the Type of Electrolyte in the Modifying Solution on the Protective Properties of Vinyltrimethoysilane/Ethanol-Based Coatings Formed on Stainless Steel X20Cr13

Aleksandra Kucharczyk; Lidia Adamczyk; Krzysztof Miecznikowski

doi:10.3390/ma14206209

The Influence of the Type of Electrolyte in the Modifying Solution on the Protective Properties of Vinyltrimethoysilane/Ethanol-Based Coatings Formed on Stainless Steel X20Cr13

Materials (Basel). 2021 Oct 19;14(20):6209. doi: 10.3390/ma14206209.

Authors

Aleksandra Kucharczyk¹, Lidia Adamczyk¹, Krzysztof Miecznikowski²

Affiliations

¹ Department of Materials Engineering, Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology, Aleja Armii Krajowej 19, 42-200 Czestochowa, Poland.
² Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Warsaw, Ludwika Pasteura 1, 02-093 Warsaw, Poland.

Abstract

The paper reports the results of the examination of the protective properties of silane coatings based on vinyltrimethoxysilane (VTMS) and ethanol (EtOH), doped with the following electrolytes: acetic acid (AcOH), lithium perchlorate LiClO₄, sulphuric acid (VI) H₂SO₄ and ammonia NH₃. The coatings were deposited on stainless steel X20Cr13 by the sol-gel dip-coating method. The obtained VTMS/EtOH/Electrolyte coatings were characterized in terms of corrosion resistance, surface morphology and adhesion to the steel substrate. Corrosion tests were conducted in sulphate media acidified up to pH = 2 with and without chloride ions Cl^-, respectively. The effectiveness of corrosion protection was determined using potentiometric curves. It has been demonstrated that the coatings under study slow down the processes of corrosion of the steel substrate, thus effectively protecting it against corrosion.

Keywords: corrosion; silane; sol–gel; vinyltrimethoxysilane.