Title

DRY SLIDING WEAR BEHAVIOR OF HARD CHROMIUM AND NICKEL-BASED COATINGS IN BALL ON RING TEST

DRY SLIDING WEAR BEHAVIOR OF HARD CHROMIUM AND NICKEL-BASED COATINGS IN BALL ON RING TEST

Authorship

Gines, Marcelo J.L.; Tuckart, Walter; Abraham, Sebastián

Gines, Marcelo J.L.

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Tuckart, Walter

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Abraham, Sebastián

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DOI

10.5151/5463-5463-17238

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Abstract

This study addresses the dry sliding wear behavior of different hard chromium coatings and they are compared to mono and multilayered nickel-based coatings which could be a replacement of conventional hard chromium coatings. Both hard chromium and nickel- based coatings were obtained over a substrate of AISI H13 steel by electroplating from hexavalent chromium and nickel-tungsten-phosphorus aqueous solutions, respectively. Monolayer hard chromium coatings were prepared by changing current density, temperature, and bath composition (proprietary non-fluoride catalyst). Mono and multilayered nickel-based coatings were prepared by using various current densities leading to different structure and composition, and consequently distinct mechanical properties. Scanning electron microscopy and X-ray diffraction were employed to assess the morphology and microstructure of the coatings. According the wear test results, nickel-based coatings were less prone to wear than hard chromium coatings even though the latter are harder (hard chromium: 900-1100 HV; nickel-based: 500-600 HV). This behavior might be attributable to different wear mechanisms: abrasive wear type plowing for nickel-based coatings and adhesive wear for hard chromium coatings.

Keywords

Hard chromium; Nickel-based coatings; Wear sliding; Nanoestructered coatings.

Hard chromium; Nickel-based coatings; Wear sliding; Nanoestructered coatings.