Deposition of Coating to Protect Waste Water Reservoir in Acidic Solution by Arc Thermal Spray Process

Abstract EN

The corrosion characteristics of 304 stainless steel (SS) and titanium (Ti) coatings deposited by the arc thermal spray process in pH 4 solution were assessed.

The 3b2:?thyc=10 Ti-sprayed3b2:?thyc coating exhibits uniform, less porous, and adherent coating morphology compared to the 3b2:?thyc=10 SS-sprayed3b2:?thyc coating.

The electrochemical study, that is, electrochemical impedance spectroscopy (EIS), revealed that as exposure periods to solution were increased, the polarization resistance (Rp) decreased and the charge transfer resistance (Rct) increased owing to corrosion of the metallic surface and simultaneously at the same time the deposition of oxide 3b2:?thyc=10 films/corrosion 3b2:?thyc on the 3b2:?thyc=10 SS-3b2:?show $132# sprayed3b2:?thyc surface, while Ti coating transformed unstable oxides into the stable phase.

Potentiodynamic studies confirmed that both sprayed coatings exhibited passive tendency attributed due to the deposition of corrosion products on SS samples, whereas the 3b2:?thyc=10 Ti-sprayed3b2:?thyc sample formed passive oxide films.

The Ti coating reduced the corrosion rate by more than six times compared to the SS coating after 312 h of exposure to sulfuric acid- (H2SO4-) contaminated water solution, that is, pH 4.

Scanning electron microscope (SEM) results confirmed the uniform and globular morphology of the passive film on the Ti coating resulting in reduced corrosion.

On the other hand, the corrosion products formed on 3b2:?thyc=10 SS-sprayed3b2:?thyc coating exhibit micropores with a 3b2:?thyc=10 net-like3b2:?thyc microstructure.

X-3b2:?show $132# ray diffraction (XRD) revealed the presence of the composite oxide film on 3b2:?thyc=10 Ti-sprayed3b2:?thyc samples and lepidocrocite (γ-FeOOH) on the 3b2:?thyc=10 SS-coated3b2:?thyc surface.

The transformation of TiO and Ti3O into TiO2 (rutile and anatase) and Ti3O5 after 312 h of exposure to H2SO4 acid reveals the improved corrosion resistance properties of 3b2:?thyc=10 Ti-sprayed3b2:?thyc coating.