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Enhancement of corrosion protection of low nickel austenitic stainless steel by electroactive polyimide-CuO composites coating in chloride environment

Jeetendra Kumar Malav (Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology, Nagpur, India)
Ramesh C. Rathod (Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology, Nagpur, India)
Vipin Tandon (Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology, Nagpur, India)
Awanikumar P. Patil (Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology, Nagpur, India)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 9 August 2019

Issue publication date: 17 October 2019

128

Abstract

Purpose

The purpose of this study is to improve the anticorrosion performance of low nickel stainless steel (AISI 201) in 3.5% NaCl by electroactive polyimide/copper oxide (EPI/CuO) composites coating.

Design/methodology/approach

Electroactive polyimide/copper oxide (EPI/CuO) composites were prepared by oxidative coupling polymerization followed by thermal imidization method.

Findings

The functional and structural properties of composites were characterized by X-ray diffraction, Fourier transmission infra-red and ultra violet-visible spectroscopy and the surface topography was characterized by field emission scanning electron microscope analysis and anticorrosion performance in 3.5 Wt.% NaCl was evaluated by electrochemical techniques. The obtained results of electrochemical techniques measurement indicated that the composites coated samples give better corrosion protection against attacking electrolyte.

Originality/value

The ever-increasing price of nickel (Ni) is driving the industries to use low-Ni austenitic stainless steels (ASSs). However, it exhibits relatively poor corrosion resistance as compared with conventional Cr-Ni ASSs. Nonetheless, its corrosion resistance can be enhanced by polymeric (electroactive polyimide [EPI]) coating. CuO particles exhibit the hydrophobic properties and can be used as inorganic filler to incorporate in EPI to further enhance the corrosion protection. The present research paper is beneficial for industries to use low-cost AISI 201, enhance its corrosion resistance and replace the use of costly conventional Cr-Ni ASSs.

Keywords

Citation

Malav, J.K., Rathod, R.C., Tandon, V. and Patil, A.P. (2019), "Enhancement of corrosion protection of low nickel austenitic stainless steel by electroactive polyimide-CuO composites coating in chloride environment", Anti-Corrosion Methods and Materials, Vol. 66 No. 6, pp. 774-781. https://doi.org/10.1108/ACMM-01-2019-2057

Publisher

:

Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited

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