Abstract
In this study, we introduced a novel environmentally-friendly electrolyte consisting of polytetrafluoroethylene (PTFE) nanoparticles and malic acid solution to fabricate composite anodic film on Ti-10V-2Fe-3Al alloy at different electrolyte temperatures. The morphology revealed that the PTFE nanoparticles were successfully incorporated into composite anodic films and embedded preferentially in the pores and cracks. Their performances (wear, corrosion and hydrophobicity) were evaluated via electrochemical tests, ball on disc tests, and a contact angle (CA) meter. Compared to the substrate of titanium alloy Ti-10V-2Fe-3Al, the composite anodic films exhibited the low wear rates, high corrosion resistance and good hydrophobicity. However, the microstructure and morphology of the films were affected by the electrolyte temperature. As a result, their performances were changed greatly as a function of the temperature and the film fabricated at 20 °C exhibited better performances (CA = 131.95, icorr = 6.75 × 10−8 A·cm−2, friction coefficient = 0.14) than those at other electrolyte temperatures. In addition, the corresponding lubrication mechanism of the composite anodic films was discussed.
Highlights
Titanium (Ti) and its alloys, possessing good corrosion resistance, high strength-to-weight ratio, good fracture toughness, and high melting point, have been widely used in aerospace-related fields including high-speed propellers, compressor blades, aeromotors etc. [1,2,3,4]
This can be attributed to three reasons: (i) the low electrolyte temperature unfits thermodynamic factors [32], (ii) the β phase existing on the samples may become higher at local electrode temperature [33,34] and (iii) composite anodic films first appear on the β phase as explained by Li et al [31]
|Z| values are changed with electrolyte temperatures, indicating that the electrolyte temperature has a great influence on |Z| value and corrosion resistance of samples
Summary
Titanium (Ti) and its alloys, possessing good corrosion resistance, high strength-to-weight ratio, good fracture toughness, and high melting point, have been widely used in aerospace-related fields including high-speed propellers, compressor blades, aeromotors etc. [1,2,3,4]. The β titanium alloy Ti-10V-2Fe-3Al, as high-end aerospace corrosion resistant parts, are often exposed to corrosive atmospheric environments or the highly-corrosive marine environments in service [5] Their unstable friction coefficient and poor wear properties have limited their wider applications [6,7]. The influence of the PTFE malic acid electrolyte temperature on the properties of the composite anodic films is further worthy of being clarified. The malic acid solution with PTFE nanoparticles in suspension is developed as a new kind of anodizing electrolyte, aiming to fabricate composite anodic films and improve the wear and corrosion of titanium alloy Ti-10V-2Fe-3Al. The effects of electrolyte temperature on the morphology, structure, composition, corrosion and wear resistance properties of the composite anodic films were investigated. The corresponding lubrication mechanisms of the composite anodic films fabricated at different electrolyte temperatures were elucidated
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