Low-Temperature Nitrocarburizing of Austenitic Stainless Steel for Combat Corrosion in H2S Environments

Research output: Contribution to journalArticlepeer-review

Authors

  • Longyi Li
  • Jun Wang
  • Zhenghua Tang
  • Jing Yan
  • Hongyuan Fan
  • Bo Zeng

Colleges, School and Institutes

External organisations

  • Sichuan University
  • PetroChina Southwest Oil and Gas Field Company

Abstract

The time-dependent experiment was performed to investigate the corrosion behavior of low-temperature liquid nitrocarburized (LNC) 304 austenitic stainless steel in wet H2S environments. Characteristics of H2S corrosion products, as well as localized corrosion behavior, were investigated using X-ray diffraction (XRD), scanning electron microscopy, X-ray photoelectron spectroscopy (XPS), and optical profilometry. The results revealed that the untreated steels, of which the H2S corrosion product layer on the untreated surface thickened but displayed a layered defect structure as the corrosion proceeded, had a higher weight loss than the LNC. Energy-dispersive spectroscopy (EDS) served to reveal the relationship between corrosion behavior and the content of sulfur, chromium, and other elements, and the valences of these elements were illustrated by XPS. The surface morphology after removing corrosion products showed that the presence of nitrocarburized S phase could prevent general corrosion and inhibit pit propagation.

Bibliographic note

Funding Information: The authors are grateful for the grants provided by the National Natural Science Foundation of China (Grant Nos. 51471112 and 51611130204), the Science and Technology Planning Project of Sichuan (Grant No. 2016GZ0173), and the Royal Society, United Kingdom (Newton Mobility Grant No. IE151027). Publisher Copyright: © 2020, The Minerals, Metals & Materials Society and ASM International. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

Details

Original languageEnglish
Pages (from-to)4242-4256
Number of pages15
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume51
Issue number8
Publication statusPublished - 1 Aug 2020