Response of Duplex Cr(N)/S and Cr(C)/S Coatings on 316L Stainless Steel to Tribocorrosion in 0.89% NaCl Solution Under Plastic Contact Conditions
Two duplex coatings, Cr(N)/S and Cr(C)/S, were deposited on 316L stainless steel by magnetron sputtering. The effectiveness of these duplex coatings in improving the tribocorrosion behaviour of medical alloys under elastic contact conditions has been demonstrated in a recent publication. The present work focused on the response of these duplex coatings to tribocorrosion under plastic contact conditions. Tribocorrosion tests were conducted in 0.89 % NaCl solution at 37oC at an initial contact pressure of 740 MPa and under unidirectional sliding conditions for sliding duration up to 24 h. The results showed that during sliding in the corrosive solution, the duplex coatings were plastically deformed into the substrate to a depth about 1 m. The Cr(C)/S duplex coating had sufficient ductility to accommodate the deformation without cracking, such that it was worn through gradually, leading to the gradual increase in open circuit potential (OCP) and coefficient of friction (COF). On the other hand, the Cr(N)/S duplex coating suffered from cracking at all tested potentials, leading to coating blistering after prolonged sliding at OCP and stable pit formation in the substrate beneath the coating at applied anodic potentials.
This is the peer reviewed version of the following article: Sun Y, Dearnley PA, Mallia B. 2016. Response of duplex Cr(N)/S and Cr(C)/S coatings on 316L stainless steel to tribocorrosion in 0.89% NaCl solution under plastic contact conditions. J Biomed Mater Res Part B 2016:00B:000–000, which has been published in final form at [10.1002/jbm.b.33690. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Citation : Sun, Y., Dearnley, P.A. and Mallia, B. (2016) Response of Duplex Cr(N)/S and Cr(C)/S Coatings on 316L Stainless Steel to Tribocorrosion in 0.89% NaCl Solution Under Plastic Contact Conditions. Journal of Biomedical Materials Research, 105 (6), pp. 1503-1513
Research Group : Emerging Technologies Research Centre
Research Institute : Institute of Engineering Sciences (IES)
Peer Reviewed : Yes