Effect of bath temperature on nanocrystalline Ni-polytetrafluoroethylene composite coatings prepared by brush electroplating

Abstract

Brush electroplated Ni-polytetrafluoroethylene (PTFE) composite coatings with uniform distribution of PTFE particles in the nanocrystalline Ni matrix were prepared by changing the bath temperature. The effects of the bath temperature on the deposition, microstructure and tribological properties of the composite coatings were investigated. Experimental results show that the PTFE content in coatings, deposition rate and the tribological properties trend to increase with increasing bath temperature, and the composite coating prepared at the bath temperature of 40uC reaches a maximum in surface morphology. However, it is difficult to successfully prepare the composite coatings when the bath temperature is above 40uC owing to their poor adhesion to the substrate. Therefore, some measures should be taken when the composite coatings are prepared at the bath temperatures above 40uC.

Effect of Annealing Treatment on Microstructure and Properties of Cr-Coatings Deposited on AISI 5140 Steel by Brush-Plating

“…The micro-cracks can grow either along the nodule boundaries or directly from the nodule interior (see Figure 1a). It has been pointed out that the formation and propagation of cracks are attributed to hydrogen evolution and stress generation during the electro brush-plating [23,25,29]. The existence of micro-cracks will deteriorate the quality of the coating.…”

Preparation of Oil-Encapsulated Microcapsules and Tribological Property of Ni Composite Coating

“…In literature, the microhardness, corrosion, and wear-resistant properties of electrodeposited Ni coatings have been increased by incorporating abrasive particles like alumina, diamond, SiC, ZrC, ZrO 2 , etc. [1][2][3][4][5][6][7][8][9]. However, the COF of such coatings has always been higher.…”

“…However, the COF of such coatings has always been higher. To decrease the COF of electrodeposited Ni coatings, solid lubricant particles like MoS 2 , polytetrafluoroethylene (PTFE), and graphite have been incorporated [8,9]. However, the COF of these coatings is above 0.3.…”

Preparation of Sol-Enhanced Ni–P–Al2O3 Nanocomposite Coating by Electrodeposition

“…This discrepancy may occur due to the fact that an increase in the bath temperature has two contradictory effects on the thermodynamic and kinetic driving force [27]. Moreover, as the temperature is too high, the viscosity of the plating solution decreases, the adhesion force of the cathode surface decreases [30,31], and the content of Al 2 O 3 in the coating decreases, and the microhardness decreases. As a result, the plating temperature should be controlled at about 55°C.…”