High-temperature corrosion of nickel-chromium alloys in flowing chlorine-water vapor environments

Journal Article · Thu May 01 04:00:00 EDT 1997 · Corrosion

DOI:https://doi.org/10.5006/1.3280479· OSTI ID:495435

Tu, J P ^[1]

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1. Zhejiang Univ., Hangzhou (China). Dept. of Materials Science and Engineering

Corrosion of Ni-Cr alloys in chlorine gases containing 0 vol% to 5.0 vol% water vapor between 400 C and 700 C was investigated using thermodynamic analysis and examination of corrosion products by x-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDS), and x-ray photoelectron spectroscopy (XPS). Corrosion behavior of Ni-Cr alloys in the environments studied occurred by chlorination and oxidation simultaneously. Results indicated overall kinetics of corrosion in this temperature range were influenced by the presence of water vapor. With increasing temperature, the lower partial pressure of H{sub 2}O (P{sub H{sub 2}O}) had little effect on the corrosion process. At higher P{sub H{sub 2}O}, the corrosion rate decreased because of formation of a condensed Cr{sub 2}O{sub 3}-rich layer on the surface of the corrosion product scale formed on the Ni-Cr alloys.

• Sponsoring Organization: USDOE
• OSTI ID: 495435
• Journal Information: Corrosion, Journal Name: Corrosion Journal Issue: 5 Vol. 53; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHLORINATION
CHLORINE
CHROMIUM ALLOYS
CHROMIUM OXIDES
CORROSION
NICKEL BASE ALLOYS
OXIDATION
WATER VAPOR