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Abstract
Because of its excellent properties, carbon steel is a material widely used in several sectors. However, it is easily corroded when exposed to the environment. Seeking to remedy this problem, the possibility of coating carbon steel with SiOx/SiOxCyHz films generated by deposition and oxidation in low-pressure plasmas was investigated. Specifically, the effects of excitation power of the oxidation plasma on layer thickness, chemical structure, elemental composition, and barrier properties of the obtained coatings were investigated. The coating of the steel with the SiOxCyHz film, generated by plasma in an atmosphere of hexamethyldisiloxane (HMDSO), increased the total resistance to the passage of electric current, measured by electrochemical impedance spectroscopy. However, under the condition of moderate power oxidation (50 W), the results point to the creation of a bilayer system with high resistance to electrochemical attack compared to the SiOxCyHz film, even though its thickness is less than this.
Highlights
Carbon steel has several attractive properties, such as high strength, good malleability, ductility, plasticity, easy forging, welding, and cutting, all combined with a relatively low cost[1,2,3]
The results showed that to act as a protective barrier, the micropores present in the coating must be sealed by the molten material that is generated by the deposition process itself
The substrate materials were selected considering the focus of the work and the requirements of Electrical configuration used in the cleaning treatment and the deposition of the SiOxCyHz film. (Dotted line) Electrical configuration used in oxidation treatments in O2 plasmas
Summary
Carbon steel has several attractive properties, such as high strength, good malleability, ductility, plasticity, easy forging, welding, and cutting, all combined with a relatively low cost[1,2,3]. The elevation of the film density, ascribed to removal of the methyl groups and to establishment of crosslinkings, resulted in hardness values comparable to that of silica and a structure more resistant to the penetration of oxidative species, whereas preserving the organosilicon nature of the material Considering these aspects, the possibility of coating carbon steel with multilayer SiOx/SiOxCyHz systems that have improved barrier properties was investigated in this work, combining, for their production, deposition, and oxidation methodologies in plasma low- pressure. It was investigated the effect of the oxidation plasma, with the samples in floating potential during the treatment, on the elemental composition, chemical structure, and the corrosion resistance of organosilicon films, deposited in plasma of mixture of hexamethyldisiloxane with oxygen and argon. They were cleaned in an ultrasonic bath of isopropyl alcohol for 480 seconds and dried in a hot air stream
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