Protective effect of superhydrophobic coatings on carbon steel in different environments

• V.I. Vigdorovich¹, L.E. Tsygankova^1,2, M.N. Uryadnikova², K.A. Emel’yanenko³, E.V. Chulkova³ and A.A. Uryadnikov^1,2

¹ All-Russian Scientific Research Institute of Use of Machinery and Oil Products, Novo-Rubezhnyi per., 28, Tambov, 392022, Russian Federation
² Derzhavin State University, ul. Internatsyonalnaya, 33, Tambov, 392000, Russian Federation
³ A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, 119071 Moscow, Russian Federation

Abstract: The features of the protective efficiency of nanocomposite superhydrophobic coatings of 4 types on carbon steel are considered. The first type of coating was obtained by texturing the St3 steel surface using nanosecond IR laser radiation with subsequent chemisorption of methoxy{3-[(2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluorooctyl)oxy]propyl}silane from solution in n-decane (MAF). To obtain a type II coating, a nano-sized composite layer consisting of Aerosil nanoparticle aggregates coated with the same hydrophobic agent was additionally applied on the type I coating. To obtain a type III coating, the St3 working surface was textured with a nanosecond IR laser, followed by chemisorption of a hydrophobizing agent, CF3(CF2)6(CH2)O¬(CH2)2C(OCH3)3, from the vapor phase. Type IV coatings were obtained by texturing the steel surface with a nanosecond IR laser followed by treatment with ultraviolet radiation in the presence of ozone plasma. Further, for hydrophobization, the samples were kept in a closed container containing saturated vapors of the methoxy{3-[(2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluorooctyl)oxy]propyl}silane hydrophobizing agent. Then heat treatment was carried out at 150°. The contact angle on the obtained samples was 168–172°. Gravimetric corrosion tests and polarization measurements, as well as measurements of the contact angle on the obtained superhydrophobic samples over time were conducted. Studies have been carried out in neutral chloride medium, NACE medium +400 mg/L H₂S and under conditions of 100% humidity. In the latter case, superhydrophobic coatings of types I and II did not undergo changes within 112 days. In a neutral chloride medium, their protective effect is close to 96%. An environment with H₂S causes the fragility of the anti-corrosion properties of the super-hydrophobic coating. The use of ultraviolet irradiation treatment in the presence of ozone plasma during the formation of superhydrophobic coatings contributes to an increase in their anticorrosion properties.

Keywords: steel, superhydrophobic coating, contact angle, corrosion rate, protective effect, sodium chloride, hydrogen sulfide

Int. J. Corros. Scale Inhib., 2021, 10, no. 3, 1157-1167
doi: 10.17675/2305-6894-2021-10-3-19

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