Abstract
Anti-adhesive Ni coatings with low wettability were successfully fabricated on Ti6Al4V substrates via an electro-brush plating method, and subsequently modified with a fluoroalkylsilane (FAS) film. The surface morphology, chemical compositions, and wettability of the as-prepared coatings were measured using scanning electron microscopy (SEM), X-ray diffractometer (XRD), Fourier transform infrared spectrophotometry (FTIR), and contact angle measurements. The results showed that the surface of Ti6Al4V substrate was endowed with flower-like structures. Each flower-like cluster was constituted by a large number of Ni ions. After surface modification of FAS, the as-prepared Ti6Al4V surface had a water contact angle as high as 151.5°, a sliding angle close to 2.1°, and a solid surface energy as low as 0.97 mJ/m2. Potentiodynamic polarization tests showed that the Ni coating could provide a stable corrosion protection. In addition, the effects of processing conditions, such as working voltage, relative velocity, electrolyte concentration, and processing time, were investigated. The mechanism of the adhesive resistance was proposed, and the low wettability of Ti6Al4V surfaces was explained by Cassie–Baxter model. As a result, it was necessary to reduce the fraction of the solid–liquid interface in order to achieve anti-adhesive surface.
Highlights
Titanium alloy has many attractive properties like outstanding mechanical and thermal properties, excellent corrosion resistance, and high strength-to-weight ratio, which make it to be one of the most widely used materials for successful application in the aerospace, automotive, and biomedical fields [1,2,3]
There are few reports on the adhesive resistance of titanium alloy surfaces prepared by electro-brush plating
To understand the growth process of morphological structure on as-prepared Ti6Al4V substrate surface, the effect of the processing time on the surface morphology was studied by scanning electron microscopy (SEM), and observations were done at the working voltage of 25 V, the relative velocity of 7 m/min, and the NiSO4 concentration of 400 g/L
Summary
Titanium alloy has many attractive properties like outstanding mechanical and thermal properties, excellent corrosion resistance, and high strength-to-weight ratio, which make it to be one of the most widely used materials for successful application in the aerospace, automotive, and biomedical fields [1,2,3]. Gao et al fabricated a low-wetting surface with a water contact angle of 158◦ as well as a sliding angle of 5.3◦ on Ti6Al4V alloy by anodization [4]. Shen et al prepared an anti-adhesive surface with micro–nanoscale hierarchical structures on Ti6Al4V alloys through a combination of sand blasting and hydrothermal method This process improved the water contact angle from 134◦ to 161◦and the sliding angle from 12◦ to 3◦ [5]. The preparation of low-wetting surface on titanium alloy substrate can significantly improve the adhesion and corrosion resistance. Most of these methods involved some drawbacks, including expensive equipment, strict conditions, and complex operation. Afterwards, the effects of processing parameters such as working voltage, relative velocity, electrolyte concentration, and processing time were investigated
Sign-in/Register to view highlights & summary 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.
