Deposition of Coating to Protect Waste Water Reservoir in Acidic Solution by Arc Thermal Spray Process
作者： Han-Seung Lee , Jin-ho Park , Jitendra Kumar Singh , Mohamed A Ismail , None
DOI: 10.1155/2018/4050175
关键词: Scanning electron microscope 、 Materials science 、 Titanium 、 Oxide 、 Anatase 、 Coating 、 Corrosion 、 Microstructure 、 Chemical engineering 、 Thermal spraying
摘要: 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. Ti-sprayed coating exhibits uniform, less porous, adherent morphology compared to SS-sprayed coating. electrochemical study, that is, impedance spectroscopy (EIS), revealed as exposure periods increased, polarization resistance (Rp) decreased charge transfer (Rct) increased owing metallic surface simultaneously at same time deposition oxide films/corrosion on SS- sprayed surface, while Ti transformed unstable oxides into stable phase. Potentiodynamic studies confirmed both exhibited passive tendency attributed due products SS samples, whereas sample formed films. reduced rate more than six times after 312 h sulfuric acid- (H2SO4-) contaminated water solution, 4. Scanning electron microscope (SEM) results uniform globular film resulting corrosion. On other hand, exhibit micropores with a net-like microstructure. X- ray diffraction (XRD) presence composite samples lepidocrocite (γ-FeOOH) SS-coated surface. transformation TiO Ti3O TiO2 (rutile anatase) Ti3O5 H2SO4 acid reveals improved properties
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