A study on corrosion behavior of graphene oxide coating produced on stainless steel by electrophoretic deposition

• Published in: Surface & coatings technology Vol. 372; pp. 327 - 342
• Main Authors: Mahmoudi, M., Raeissi, K., Karimzadeh, F., Golozar, M.A.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25.08.2019; Elsevier BV
• Subjects: Adhesion; Anodizing; Austenitic stainless steels; Buffers; Corrosion resistance; Corrosion resistant steels; Corrosion tests; Electrophoretic; Electrophoretic deposition; Fourier transforms; Graphene; Graphene oxide; Graphene oxide reduction; Infrared analysis; Oxide coatings; Protective coatings; Raman spectroscopy; Reduction; Scanning electron microscopy; Stainless steel; Substrates; Surface preparation; Thermal analysis; Thickness; Thin films; Corrosion resistance; Graphene oxide; Graphene oxide reduction; Adhesion; Electrophoretic; Surface preparation
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2019.05.050

The purpose of this study is to investigate the effect of thickness of adhesive graphene oxide (GO) layers electrophoretically deposited on 316 stainless steel substrate on corrosion resistance. Initially, GO was synthesized from graphite using the modified Hummer method. In order to improve the adhesion of GO coatings, substrates were subjected to electropolishing and anodizing procedures. The GO was deposited from acidic (GO/water) and alkaline (GO/water/PBS buffer) solutions. To obtain a range of coating thicknesses, the GO layers were deposited using various voltages and deposition times. The produced coatings were characterized using scanning electron microscopy, X-ray diffraction, Fourier Transform Infrared, Raman spectroscopy, thermal analysis and electrochemical tests. Based on the obtained results, a partial reduction of GO during electrophoretic process and drying steps was confirmed. Compared with electropolished surface, anodizing treatment of substrate induced a better barrier property. A higher reduction of oxygen group in GO was detected by the presence of K+ ions released from PBS buffer into the suspension. It was also found that the thin GO layers obtained from alkaline solution containing PBS buffer could improve the barrier property, while, an increase in GO layers degraded it. [Display omitted] •Thin GO coating obtained from PBS-containing suspension showed barrier resistance.•A higher reduction of oxygen group in GO was detected by K+ ions in GO suspension.•Substrate anodizing was required for better corrosion performance of thin GO coating.•Due to defects developed by growth, thick GO coatings did not act as a good barrier.