Electrolytic and electroless coatings of Ni–PTFE composites

Electrochemical noise study of the effect of electrode surface wetting on the evolution of electrolytic hydrogen bubbles

“…The Ni-PTFE deposit was rougher than the pure Ni deposit, in agreement with Ref. [5]. The typical size of the observed features was comprised between some hundreds of nanometres and ca.…”

“…At variance with Refs. [5,7] , a ''sediment co-deposition'' approach was used, i.e., the suspensions were carefully stirred before each deposition, but not during the electrodeposition. Since the density of the PTFE particles (between 2.13 and 2.19) was higher than that of the electrolyte, a sediment progressively formed onto the electrode, placed horizontally and facing upwards, while the Ni deposit was growing.…”

“…Ni-PTFE layers have been investigated by several groups pursuing either the production of self-lubricating coatings [5][6][7][8][9][10][11] or that of hydrophobic electrodes for the oxidation of organic molecules [12][13][14][15]. In the former domain, Ni-PTFE composites have been prepared by cathodic electrodeposition [5,7] and more often by an electroless Ni-deposition method which actually produces composites with a NiP matrix and a PTFE dispersed phase [5,6,[8][9][10][11].…”

“…In the former domain, Ni-PTFE composites have been prepared by cathodic electrodeposition [5,7] and more often by an electroless Ni-deposition method which actually produces composites with a NiP matrix and a PTFE dispersed phase [5,6,[8][9][10][11]. In the latter, Kunugi et al [12][13][14][15] have produced Ni-PTFE electrocatalysts by cathodic co-deposition of Ni and PTFE particles from a commercial sulphamate bath.…”

Development of electroless composite coatings by using in-situ co-precipitation followed by co-deposition process

“…[3][4][5][6] Various composite coatings such as Ni-P-Al 2 O 3 , [2] Ni-P-SiC, [7] Ni-P-diamond, [8] and Ni-P-B 4 C [9] have been reported in the literature. Also, the electroless Ni-P-PT FE [10] and Ni-P-MoS 2 [11] coatings are reported to have self-lubricating properties. However, use of coprecipitation reaction for in-situ generation of hard particles within EN bath has only recently been paid attention to in the research community.…”