Corrosion Resistance and Electrical Conductivity of Hybrid Coatings Obtained from Polysiloxane and Carbon Nanotubes by Electrophoretic Co-Deposition

Abstract

Nanocomposites developed based on siloxanes modified with carbon nanoforms are materials with great application potential in the electronics industry, medicine and environmental protection. This follows from the fact that such nanocomposites can be endowed with biocompatibility characteristics, electric conductivity and a high mechanical durability. Moreover, their surface, depending on the type and the amount of carbon nanoparticles, may exhibit antifouling properties, as well as those that limit bacterial adhesion. The paper reports on the properties of polysiloxane (PS) and carbon nanotubes (CNT) nanocomposite coatings on metal surfaces produced by the electrophoretic deposition (EPD). A comparison with coatings made of pure PS or pure CNT on the same substrates using the same deposition method (EPD) is provided. The coatings were examined for morphology and elemental composition (SEM, EDS), structural characteristics (confocal Raman spectroscopy), electrical conductivity and were tested for corrosion (electrochemical impedance spectroscopy-EIS, potentiodynamic polarization-PDP). The results obtained in this study clearly evidenced that such hybrid coatings conduct electricity and protect the metal from corrosion. However, their corrosion resistance differs slightly from that of a pure polymeric coating.

Hybrid protective coatings for construction steel bars

“…The silicone resin network is responsible for the outstanding properties that increasingly spread in various industrial sectors (19)(20)(21). Their superior characteristics, such as low glass transition temperature (Tg), hardness, good mechanical resistance, adhesion, thermal stability, and insulation performance, stem from the higher bond energy and the larger bond angles of the adjacent silicon-oxygen bond (22,23).…”

Self-Healing Redox-Active Coatings Based on Ferrocenyl-Containing Polysiloxanes

“…Antistatic self-healing coatings for electrical engineering, electronics, and optoelectronics are also in great demand [1][2][3][4][5]34,35]. Most of the works are devoted to the creation of antistatic materials based on polymer composites [1][2][3][4][34][35][36] by using conductive fillers (graphite [37,38], carbon nanotubes and nanofibers [39][40][41][42][43][44][45][46], graphene [39,40,47,48], metals [38][39][40]49], metal oxides [45,46], π-conjugated polymers [40,50,51], etc.) to transform a silicone dielectric into a semiconductor (conductivity of ca.…”