The influence of Ni on the microstructure and corrosion resistance of high-strength low alloy steel in the Cl-containing environment

Abstract

Purpose

This paper aims to search the optimum content of Ni on the microstructure, phase and electrochemical behavior of high-strength low alloy (HSLA) steel in the 3.5 wt.% NaCl solution.

Design/methodology/approach

The microstructure and corrosion resistance of Ni-containing HSLA steel in the simulated marine environment was studied by optical microscopy, scanning electron microscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical techniques.

Findings

The sample containing 3.55 wt.% of nickel exhibited a finer grain size of 10 μm and a lower i_corr of 2.169 µA cm⁻². The XRD patterns showed that the Fe-Cr-Ni solid solution, FeC and Cr₃C₂ were observed in samples when Ni was added. Besides, the 3.55 wt.% of nickel addition enhanced the charge transfer resistance of the low alloy steel which suggested the sample possessed excellent inhibition of electrochemical reaction and corrosion resistance. The XPS spectrum suggested that nickel was beneficial to improve the corrosion resistance of steel by forming protective oxides, and the ratio of Fe²⁺/Fe³⁺ in protective oxides was increased.

Practical implications

Finding the comprehensive performance of HSLA steel which can be applied to unmanned surface vehicles in marine operations.

Originality/value

This study has a guiding significance for optimizing the composition of HSLA steel in a Cl- containing environment.

Citation

Wang, D., Zhong, Q., Yang, J. and Zhang, S. (2022), "The influence of Ni on the microstructure and corrosion resistance of high-strength low alloy steel in the Cl-containing environment", Anti-Corrosion Methods and Materials, Vol. 69 No. 1, pp. 9-16. https://doi.org/10.1108/ACMM-04-2021-2470