Plasma Electrolytic Oxidation (PEO) Coatings
On A Zirconium Alloy For Improved Wear And
Corrosion Resistance
Author(s)
Y. Chen, X. Nie & D. O. Northwood
Abstract
Zr oxide coatings were deposited using plasma electrolytic oxidation (PEO) on
Zr-2.5wt%Nb (Zr-2.5Nb) alloy, which is currently used for pressure tubes in the
CANDU nuclear reactor. The effects of two PEO processing factors, electrolyte
concentration and current density, on the microstructure and properties of the
coatings were systematically investigated. The coating morphology and chemical
composition were determined using scanning electron microscopy (SEM) and
energy dispersive X-ray analysis (EDX). Potentiodynamic polarization corrosion
testing was used to examine the corrosion resistance of the coatings in a dilute
aqueous, LiOH solution. Pin-on-disc wear tests were performed under dry and
lubricated sliding conditions. SEM was also used to characterize the wear traces
on the coated and uncoated surfaces. A 30-day autoclave experiment was carried
out to study the corrosion performance of the Zr-2.5Nb substrate, PEO coatings
and a commercial autoclaved black oxide coating. Based on the results of this
research, recommendations are made as to processing parameters for the
production of oxide coatings with improved wear and corrosion resistance.
Keywords: Zr-2.5Nb, PEO, commercial black oxide coating, corrosion and wear
resistance, autoclave.
1 Introduction
Zr-2.5wt%Nb (hereafter, referred to as Zr-2.5Nb) has been used in CANDUPHW
type nuclear reactors for the manufacture of pressure tubes (PT) because of
its low neutron absorption cross-section, high corrosion resistance, high strength
and creep resistance [1–4]. The inside surfaces of the PTs are in contact with
Keywords
Zr-2.5Nb, PEO, commercial black oxide coating, corrosion and wear
resistance, autoclave
Related Book
Other papers in this volume
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