Effect of TiO2 Sol and PTFE Emulsion on Properties of Cu–Sn Antiwear and Friction Reduction Coatings

Abstract

The aim of this paper is to obtain Cu–Sn composite coatings incorporated with PTFE and TiO2 particles, which have superior antiwear and friction reduction properties. Electrodeposition was carried out in a pyrophosphate electrolyte, and the electrochemical behavior of the plating solutions was estimated. PTFE emulsion and TiO2 sol were prepared and used, of which the average particle sizes were less than 283 and 158 nm, respectively. Then, four different types of coatings, Cu–Sn, Cu–Sn–TiO2, Cu–Sn–PTFE and Cu–Sn–PTFE–TiO2, were electroplated with a pulsed power supply. Their microstructure, composition, microhardness, corrosion resistance and tribological properties were then analyzed and compared in detail. The results show that both PTFE and TiO2 are able to improve coating structure and corrosion resistance, while they have different effects on hardness and tribological properties. However, the presence of both PTFE and TiO2 in the deposited coating leads to a lower friction coefficient of 0.1 and higher wear and corrosion resistance.

Effect of TiO2 Concentration on Microstructure and Properties of Composite Cu–Sn–TiO2 Coatings Obtained by Electrodeposition

“…Galvanic coatings modified with TiO 2 nanoparticles can exhibit photocatalytic properties, which is well demonstrated in the literature [ 33 , 34 , 35 ]. Improved tribological properties of Cu–Sn–TiO 2 coatings were reported in [ 25 , 30 , 31 ]. Nevertheless, to our best knowledge, the effect of TiO 2 particles on the co-deposition of copper and tin, as well as on the corrosion and antibacterial properties of such nanocomposites has not been studied widely in the literature.…”

“…The use of electrochemical deposition for this purpose has many important advantages, such as low energy consumption, uniform distribution of reinforcing particles in a metal matrix, and better bonding between particles and metal matrix [ 24 , 26 , 27 ]. Composite coatings Cu–Sn–SiC [ 28 ], Cu–Sn–graphite–Al 2 O 3 [ 29 ], and Cu–Sn–TiO 2 [ 25 , 30 , 31 ] with improved tribological and physicomechanical properties were obtained electrochemically. Titanium(IV) oxide due to its physical-mechanical and photocatalytic properties, as well as chemical resistance in corrosive media, is widely used as a hardening phase in the deposition of composite coatings [ 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ].…”

Ultrasonic-assisted electrodeposition of Cu-Sn-TiO2 nanocomposite coatings with enhanced antibacterial activity

“…To date, several types of nanocomposite coatings, e.g. Cu–Sn–SiC [31] , Cu–Sn–graphite–Al 2 O 3 [32] , and Cu–Sn–TiO 2 [33] with enhanced mechanical and physico-chemical properties were successfully obtained based on Cu–Sn alloys. In this regard, the implementation of titanium dioxide as a second-phase material has many advantages, such as its chemical inertness, anti-wear, and photocatalytic activity in various environments.…”

Viscosity characterization and flow simulation and visualization of polytetrafluoroethylene paste extrusion using a green and biofriendly lubricant

“…[ 1 ] These unique properties make it a popular material choice for the chemical, coating, composites, defense, medical industries, and telecommunications, among others. [ 2‐5 ] PTFE also has the unique ability to fibrillate when expanded at a high strain rate, which produces a unique porous structure. [ 6 ] This expanded form of the material, called ePTFE, exhibit drastically different mechanical properties compared to the original material; particularly, higher compliance and lower tensile strength.…”