Tribological and corrosion behaviors of fluorocarbon coating reinforced with sodium iron titanate platelets and whiskers

Abstract

A series of sodium iron titanate (NFTO)–fluorocarbon composite coatings have been prepared with the liquid‐phase blending method. The effects of two types of NFTO, NFTO platelets, and NFTO whiskers, on the tribological and corrosion behaviors of the composite coatings, are systematically studied. The results show that the addition of NFTO can significantly enhance the friction‐reducing and wear resistance performances of the fluorocarbon coating. Under dry sliding, the minimum specific wear rate is 1.67 × 10−4 mm3/Nm for the platelet‐filled composite coatings and 1.15 × 10−4 mm3/Nm for the whisker‐filled composite coatings, respectively, showing a decrease of 83.5 and 88.6% than that of pure coating. Under a simulated seawater environment, the minimum specific wear rate is 5.44 × 10−5 mm3/Nm for the platelet‐filled composite coatings and 0.84 × 10−5 mm3/Nm for the whisker‐filled composite coatings, respectively, showing a decrease of 90.5 and 98.5% than that of pure coating. The morphologies of worn surfaces, wear debris, and transfer films are analyzed, and the corresponding wear resistance mechanisms are discussed. The electrochemical impedance spectroscopy certifies a remarkably improved corrosion resistance of the composite coatings which have been immersed in 3.5 wt % NaCl solution for 30 days. The composite coating reinforced with 7.5 wt % platelets shows the highest resistance of 256.3 × 106 Ω·cm2, approximately two orders of magnitude higher than that of pure coating. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48936.

Effect of Fluorocarbon Polymers on Hydrophobicity, Wear Resistance and Corrosion Resistance of Epoxy Resins

“…Li prepared a series of NFTO composite coatings. Electrochemical impedance spectroscopy proved that the corrosion resistance of composite coatings immersed in 3.5 wt.% NaCl solution for 30 days was significantly improved [12]. M. Cichomski modified the resulting coatings with perfluorinated and alkyl phosphonic acid self-assembly layers with hydrocarbon or perfluorocarbon chains (DP and PFDP), which, applied to the top of Ti-DLC coatings, significantly improved their tribological and corrosion properties [13].…”

Reduced graphene oxide/silica nanocomposite‐reinforced anticorrosive fluorocarbon coating

“…Therefore, micron-and nano-fillers have been introduced to the organic resin in order to enhance the anti-corrosion property of FEVE coating. [12][13][14][15][16][17][18][19] Two-dimensional (2D) graphene nanomaterials possess exceptional properties in terms of thermal conductivity, stability, mechanical strength, etc., 20,21 and have been employed as functional fillers to enhance the wear resistance, thermal conductivity, and anti-corrosion properties of organic coatings. 21,22 Graphene sheets have planar structure and can form a "labyrinth effect" inside a polymer coating if they are homogeneously dispersed in the coating, so that the diffusive migration of corrosive media such as H 2 O, O 2 , and Cl − can be greatly reduced and the corresponding metal corrosion rate can be delayed.…”