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Effect of carbides on sensitivity of pitting corrosion in Inconel 718 alloy

Xianping Wei (State Key Laboratory of Long-life High Temperature Materials, Deyang, China and Dongfang Electric Corporation Dongfang Turbine Co., LTD, Deyang, China)
Wen Jie Zheng (Central Iron and Steel Research Institute Group, Beijing, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 7 February 2020

Issue publication date: 11 March 2020

Abstract

Purpose

This paper aims to expand the application area of Inconel 718 alloy in marine environment, the sensitivity of pitting corrosion should be analyzed and discussed, especially the effect of block carbides.

Design/methodology/approach

Effect of carbides on the sensitivity of pitting corrosion for Inconel 718 alloy was carried out at 30°C in 3.5% NaCl solution using dynamic electrochemical impedance spectroscopy and anodic polarization techniques. In addition, the initiation of pitting corrosion was investigated by immersion test in 0.05 M HCl + 6% FeCl3 solution.

Findings

As a result, the precipitation of carbides, as the initiation of pitting corrosion, increased pitting corrosion susceptibility, especially the block carbides could lead to deep-spalling. Within that process, temperature and potential acted as the main controlling factors, and the effect of the latter was more distinct.

Originality/value

The initiation of pitting corrosion was revealed by the immersion test. The mechanism of pitting corrosion was analyzed and discussed.

Keywords

Citation

Wei, X. and Zheng, W.J. (2020), "Effect of carbides on sensitivity of pitting corrosion in Inconel 718 alloy", Anti-Corrosion Methods and Materials, Vol. 67 No. 2, pp. 158-165. https://doi.org/10.1108/ACMM-10-2018-2025

Publisher

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Emerald Publishing Limited

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