Tribo-corrosion of coatings: a review

Abstract

This paper reviews the available literature relating to the emerging research into the performance of coatings under combined wear and corrosion conditions. Understanding how coatings perform under these tribo-corrosion conditions is essential if the service life of equipment is to be predicted and to allow service life to be extended. Therefore, the tribo-corrosion performance of coatings deposited by a variety of techniques is discussed and the main mechanisms associated with their degradation under combined wear and corrosion highlighted. Coating composition, microstructure, defect level, adhesion, cohesion and substrate properties are seen as some of the critical elements in coating performance when subjected to tribo-corrosion contacts. The importance of post-coating deposition treatments such as laser resurfacing and sealing are also discussed. Interactions between wear and corrosion mechanisms are identified along with some models and mapping techniques that aim to inform coating selection and predict performance. Recent investigations into mono-layer as well as multilayered and functionally graded coatings are reviewed as candidates for wear-corrosion resistant surfaces. The review reveals the need for a more considered approach to tribo-corrosion testing and the way in which the results are analysed and presented. For example, the test conditions should be appropriate to the coating system under test; the level of in situ instrumentation deployed and the post-test analysis of in situ electrochemical data should be carefully selected as well as details given of the composition of any surface tribofilms formed and the identification of the degradation mechanisms.

Tribocorrosion behaviour of TiC O thin films in bio-fluids

“…There are no significant difference in the evolution of friction coefficient at different loads and as in the previous case, did not show a definite pattern in the variation. Further, in the previous study it was shown that friction coefficient values might increase or decrease, associated with the decrease and/or fluctuations in corrosion current, which is exhibiting the complexity of such dynamic tribocorrosion systems [10,16].…”

“…Recently Wood et al [10] reviewed the tribo-corrosion studies of the coatings and films. The general corrosion/tribo-corrosion behaviour of ZrC x O y and TiC x O y films in the presence of artificial perspiration solution was studied [4][5][6][7][8][9] and other work has investigated synergistic effects between corrosion and wear for the purpose of generating tribocorrosion maps for thermally sprayed coatings [11].…”

Tribocorrosion behavior and ions release of CoCrMo alloy coated with a TiAlVCN/CN multilayer in simulated body fluid plus bovine serum albumin

“…Since the long-term durability of the prosthetic joint materials rely on the successful control of both the corrosion that produces ions release and the tribocorrosion resistance that produces ions release and oxide or plastic debris, Physical Vapor Deposition (PVD) multilayer coatings offer a multifunctional protection alternative and good adherence to metallic substrates in comparison to the monolayer coating [15,[21][22][23][24][25][26]. The multilayer combine the properties of different materials in a single protective layer.…”

Composites, Multifunctional

“…This multi functional coating would then resist both corrosion, wear and provide a low coefficient of friction [113,117]. This would increase the lifetime of many engineering applica tions, and for example, increase the fuel efficiency of ve hicles since it reduces energy losses due to friction.…”

“…7. In a recent review by Wood [117] it is clear that this is a research area that re quires significant attention in the future.…”