Abstract
In cases of decorative and functional applications, chromium results in protection against wear and corrosion combined with chemical resistance and good lubricity. However, pressure to identify alternatives or to improve conventional chromium electroplating mechanical characteristics has increased in recent years, related to the reduction in the fatigue strength of the base material and to environmental requirements (1). In the present study plasma sprayed coatings (aluminum oxide, Co-28Mo-8Cr-2Si, tungsten carbide, chrome carbide) and electrolytic hard chrome coatings abrasive wear properties have been compared. The wear tests were conducted with a Taber abraser, at room temperature.
Highlights
In cases of decorative and functional applications, chromium results in protection against wear and corrosion combined with chemical resistance and good lubricity
Pressure to identify alternatives or to improve conventional chromium electroplating mechanical characteristics has increased in recent years, related to the reduction in the fatigue strength of the base material and to environmental requirements (1)
Chromium has been widely used in surface finishing of metals because of the favorable properties it imparts to substrates and because the processes used are relatively mature, well understood, widely specified, and cost effective (2)
Summary
Chromium has been widely used in surface finishing of metals because of the favorable properties it imparts to substrates and because the processes used are relatively mature, well understood, widely specified, and cost effective (2). This coating is produced from a wet chemical bath containing hexavalent chromium ions (Cr+6). Plasma spraying is a process widely used in industry for depositing protective and functional coatings for a large variety of applications. The deposition methods for the wear protective coatings are atmospheric plasma spraying (APS) and high velocity oxygen fuel (HVOF) flame spray processes. The coatings have different microstructures and properties (5)
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