In this work, we report a novel strategy for the in-situ construction of uniform silicon-based anticorrosion films on Zn metal anodes () through the treatment of tetraethyl orthosilicate (TEOS) steam on Zn disks for different times. Zinc (Zn) metal anodes are badly troubled by the challenges of notorious dendrites and corrosion reactions from H2O and I3⁻ ions during stripping/plating processes, impeding the commercial application of Zn-iodine (I2) batteries. 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. 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. 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. 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.

However, it is easily corroded when exposed to the environment. Nevertheless, the best protective efficiency achieved more than 99% of the total protection in alkaline medium as measured at room temperature for treated sample at gap distance 1 cm.Ībstract Because of its excellent properties, carbon steel is a material widely used in several sectors. It was reduced from 12 ♚/cm² for the blank sample to 0.714 ♚/cm² in treated sample at gap distance 1 cm and protective efficiency reached ∼ 94% in the neutral solution. The Icorr values were significantly decreased by reducing the gap distance and reached a minimum at 1 cm gap distance. The chemical bonding and morphological features of the deposited films were investigated by Fourier Transformer Infrared Spectroscopy in Attenuated Total Reflectance (ATR-FTIR) mode, X-Ray Diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDX) coupled with scanning electron microscopy (SEM). The corrosion performance of the coatings were evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in dependence on the gap distance between the plasma electrodes and the pH values at room temperature. Herein, thin silicon oxycarbide films as an eco-friendly anticorrosive coating were deposited on a low carbon steel substrate by a radio frequency capacitively coupled plasma technique using tetraethyl orthosilicate (TEOS) as a precursor. The best protective efficiency reached more than 97% of the total protection as measured at room temperature.Ĭhromium (VI) coatings are highly toxic and carcinogenic therefore, thea should be replaced by a new eco-friendly material that retains its effectiveness in terms of corrosion. The optimal gap distance between the electrodes was determined for corrosion protection. For this purpose, polarization and Electrochemical Impedance Spectroscopy (EIS) were used to monitor the corrosion. The corrosion protection was determined by exposure of samples to 3.5% NaCl aqueous solutions. The efficiency of the corrosion-protecting coating was compared with uncoated samples. Their properties are determined largely by the gap distance between the two samples used as electrodes in the plasma. Such thin layers consist of predominantly SiO x structures.

Recombination of fragments and condensation onto the steel substrate is responsible for the formation of organic SiO containing plasma polymer layers. The TEOS molecules become fragmented in the plasma by numerous collisions with energy-rich electrons and heavier particles. The SEM micrographs confirmed a pinhole-free surface morphology of the low-pressure deposited plasma polymer films.

The structure–property relationships of the coatings were evaluated by X-ray Photo Spectroscopy (XPS), X-Ray Diffraction (XRD), Fourier Transform InfraRed spectroscopy (ATR-FTIR) and Energy Dispersive X-ray spectroscopy (EDX) completed with Scanning Electron Microscopy (SEM). Tetraethyl orthosilicate (TEOS) was used as a chemical precursor to deposit ultra-thin SiO x C y plasma polymer films onto mild steel surfaces for preventing the corrosion process.

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