Abstract
CrMoN/Ag nanocomposite coatings with various Ag contents are deposited on Ti6Al4V alloys using closed-field magnetron sputtering, and their microstructures are detected by XRD, XPS and TEM. The electrochemical characteristics of CrMoN/Ag nanocomposite coatings are investigated using a three-electrode electrochemical workstation. The results show that the phase structure of coating contains (Cr, Mo)N solid solution and Ag crystallites. As the Ag content rises from 0.21 at.% to 4.86 at.%, the amount and size of Ag nanoparticle increase on the coating surface, and the cross-section feature of coating first becomes dense and then sparse. The corrosion resistance of coating in seawater is mainly dominated by its cross-section compactness and the amount of electrochemical active Ag. When the Ag content is 0.59 at.%, the dense cross-section and low surface roughness of coating contribute to its maximum open circuit potential of 0.173 V and charge transfer resistance Rct of 6.497 × 107 Ω∙cm2. But as the Ag content rises beyond 1.87 at.%, the potential drift range and power spectral density of coating gradually increase. Due to the occurrences of nanogalvanic corrosion and pitting corrosion, the corrosion resistance of coating is deteriorated, and then the corrosion current density icorr of coating continuously raises.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
