<  Back to the Polytechnique Montréal portal

Alternatives for hard chromium plating: Nanostructured coatings for severe-service valves

Luc Vernhes, Marwan Azzi and Jolanta-Ewa Sapieha

Article (2013)

An external link is available for this item
Show abstract
Hide abstract


In this paper, a variety of chromium-free protective coatings were evaluated as alternatives for hard chromium (HC) electroplating for valve applications, such as nanostructured cobalt-phosphor (NCP) deposited by electroplating and tungsten/tungsten carbide (W/WC) prepared by chemical vapor deposition. A series of laboratory tests including hardness, micro scratch, pin-on-disk and electrochemical polarization measurements were performed in order to compare the performance of the different coatings. In addition, mechanical resistance and fatigue resistance were evaluated using prototype valves with coated ball under severe tribo-corrosion conditions. It was shown that W/WC coating exhibits superior resistance to wear and corrosion due to high hardness and high resistance to pitting, respectively while NCP exhibits better wear resistance than HC with alumina ball and low corrosion potential which allow to use it as protective (sacrificial) coating. Both nanostructured coatings exhibited attractive tribo-mechanical and functional characteristics compared to hard chromium.

Uncontrolled Keywords

thin films; coatings; nanostructures; wear; corrosion; tribology

Department: Department of Engineering Physics
PolyPublie URL: https://publications.polymtl.ca/12985/
Journal Title: Materials Chemistry and Physics (vol. 140, no. 2-3)
Publisher: Elsevier
DOI: 10.1016/j.matchemphys.2013.03.065
Official URL: https://doi.org/10.1016/j.matchemphys.2013.03.065
Date Deposited: 18 Apr 2023 15:10
Last Modified: 03 Oct 2023 16:15
Cite in APA 7: Vernhes, L., Azzi, M., & Sapieha, J.-E. (2013). Alternatives for hard chromium plating: Nanostructured coatings for severe-service valves. Materials Chemistry and Physics, 140(2-3), 522-528. https://doi.org/10.1016/j.matchemphys.2013.03.065



Repository Staff Only

View Item View Item