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Enhanced corrosion resistance of Cr-Mn ASS by low temperature salt bath nitriding technique for the replacement of convectional Cr-Ni ASS

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

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 1 July 2019

Abstract

Purpose

The purpose of this paper is to enhance the corrosion resistance of Cr-Mn austenitic stainless steel (ASS) via low temperature salt bath nitriding and to replace the convectional Cr-Ni ASS with newly developed enhanced corrosion resistive Cr-Mn ASS.

Design/methodology/approach

The low temperature salt bath nitriding was performed on Cr-Mn ASS at 450°C for 3 h in potassium nitrate salt bath.

Findings

The present paper compares the corrosion resistance of salt bath nitrided Cr-Mn ASS with convectional Cr-Ni ASSs (316 L and 304 L ASSs) in 3.5 per cent NaCl by electrochemical techniques. The electrochemical impedance spectroscopy result shows the increase in film resistance and potentiodynamic polarization results show the enhanced corrosion resistance of nitrided Cr-Mn ASS, which is almost equivalent to that of 316 L and 304 L ASSs. This is attributed to the formation of nitrogen supersaturated dense nitride layer. The present results therefore suggest that the nitrided Cr-Mn ASS may replace costly convectional Cr-Ni ASSs for commercial and industrial applications.

Originality/value

Ever-increasing price of nickel (Ni) is driving the industries to use Ni-free or low-Ni austenitic stainless steels (ASSs). But its corrosion resistance is relatively poor as compared to conventional Cr-Ni ASSs. However, its corrosion resistance can be improved by nitriding. The low temperature salt bath nitriding of Cr-Mn ASS and its electrochemical behavior in 3.5 per cent NaCl has not been studied. The present research paper is beneficial for industries to use low cost Cr-Mn, enhance its corrosion resistance and replace the use of costly conventional Cr-Ni ASSs.

Keywords

Citation

Tandon, V., Patil, A.P. and Rathod, R.C. (2019), "Enhanced corrosion resistance of Cr-Mn ASS by low temperature salt bath nitriding technique for the replacement of convectional Cr-Ni ASS", Anti-Corrosion Methods and Materials, Vol. 66 No. 4, pp. 439-445. https://doi.org/10.1108/ACMM-10-2018-2013

Publisher

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Emerald Publishing Limited

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