Corrosion Behavior of Plasma-Nitrided 904L Austenitic Stainless Steel in Hydrofluoric Acid

Journal Article · Fri Mar 15 04:00:00 EDT 2019 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-019-03938-Y· OSTI ID:22970889

Jiang, Ruyi; Zou, Guobo; Shi, Wei; Liang, Yu; Xiang, Song ^[1]

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1. Guizhou University, College of Materials and Metallurgy (China)

A new type of high-chromium nickel molybdenum super austenitic stainless steel, 904L, has excellent corrosion resistance in acidic environments. However, the service life of 904L decreases significantly in a mixed acid system that includes hydrogen fluoride and sulfuric acid. In this article, different plasma nitriding processes were used to modify the surface of 904L stainless steel. X-ray diffraction was used to analyze the phase composition after nitriding; scanning electron microscopy and atomic force microscopy were used to examine the surface morphology after nitriding; electrochemical noise and electrochemical methods were used to study the localized corrosion behavior and the damage mechanism of the ion nitride layer; and the effect of the plasma nitride layer on the corrosion resistance was explored. The results show that with increasing nitriding time, the thickness of the nitride layer increased. Ion nitriding resulted in the coarsening of the 904L austenitic stainless steel surface. A long nitriding treatment time resulted in the precipitation of CrN in the modified layer, depleting the chromium from the matrix and remarkably reducing the corrosion resistance.

• OSTI ID: 22970889
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 3 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ATOMIC FORCE MICROSCOPY
AUSTENITIC STEELS
CHROMIUM NITRIDES
CORROSION RESISTANCE
ELECTROCHEMISTRY
HYDROFLUORIC ACID
HYDROGEN FLUORIDES
IONS
PLASMA
SCANNING ELECTRON MICROSCOPY
SERVICE LIFE
STAINLESS STEELS
SULFURIC ACID
X-RAY DIFFRACTION