English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Total hip replacement is the most effective treatment for late stageosteoarthritis. However, adverse local tissue reactions (ALTRs) associated withfretting corrosion have been observed in patients with modular total hipimplants. The purpose of this study is to increase the fretting corrosionresistance of the CoCrMo alloy and the associated metal ion release by applyinghard coatings to the surface. Cathodic arc evaporation technique (arc-PVD) wasused to deposit TiSiN and ZrN hard coatings on to CoCrMo substrates. Themorphology, chemical composition, crystal structures and residual stress of thecoatings were characterized by scanning electron microscopy, energy dispersivex-ray spectroscopy, and X-ray diffractometry. Hardness, elastic modulus, andadhesion of the coatings were measured by nano-indentation, nano-scratch test,and the Rockwell C test. Fretting corrosion resistance tests of coated anduncoated CoCrMo discs against Ti6Al4V spheres were conducted on a four-stationfretting testing machine in simulated body fluid at 1Hz for 1 million cycles.Post-fretting samples were analyzed for morphological changes, volume loss andmetal ion release. Our analyses showed better surface finish and lower residualstress for ZrN coating, but higher hardness and better scratch resistance forTiSiN coating. Fretting results demonstrated substantial improvement infretting corrosion resistance of CoCrMo with both coatings. ZrN and TiSiNdecreased fretting volume loss by more than 10 times and 1000 times,respectively. Both coatings showed close to 90% decrease of Co ion releaseduring fretting corrosion tests. Our results suggest that hard coatingdeposition on CoCrMo alloy can significantly improve its fretting corrosionresistance and could thus potentially alleviate ALTRs in metal hip implants.

Improving fretting corrosion resistance of CoCrMo alloy with TiSiN and ZrN coatings for orthopedic applications