Cold-Sprayed Composite Metal-Fluoropolymer Coatings for Alloy Protection against Corrosion and Wear

Abstract

Results of studying the properties of composite fluoropolymer-containing coatings formed by the cold spray (CS) method on the surface of constructional steel are presented. Different ways of protective coating formation are proposed. The composition of coatings was studied using SEM/EDX analysis. The incorporation of super-dispersed polytetrafluoroethylene (SPTFE) into the coating increases the corrosion resistance of the copper-zinc-based cold-sprayed coating. Analysis of the electrochemical properties obtained using EIS (electrochemical impedance spectroscopy) and PDP (potentiodynamic polarization) indicates that samples treated with SPTFE on a base copper-zinc coating showed lower corrosion current density and higher impedance modulus (jc = 8.5 × 10−7 A cm−2, |Z|f=0.1 Hz = 5.3 × 104 Ω∙cm2) than the specimen with cold-sprayed SPTFE (jc = 6.1 × 10−6 A cm−2, |Z|f=0.1 Hz = 8.1 × 103 Ω∙cm2). The best anticorrosion properties were revealed for the sample with a cold-sprayed base Cu-Zn layer annealed at 500 °C for 1 h, followed by SPTFE friction treatment and re-annealed at 350 °C for 1 h. The corrosion current density jc of such a coating is 25 times lower than that for the base Cu-Zn coating. The antifriction properties and hydrophobicity of the formed layers are described. Obtained results indicate that cold-sprayed polymer-containing coatings effectively improve the corrosion and wear resistivity of the treated material.

A Superior Corrosion Protection of Mg Alloy via Smart Nontoxic Hybrid Inhibitor-Containing Coatings

“…Such a technique was previously used in [ 54 ]. Calculation of the polarization resistance was carried out using a linear polarization resistance test [ 40 ] in a separate experiment. The electrochemical measurements were performed in triplicates for reliability and reproducibility.…”

“…Several methods are known for applying such protective layers, for example, sol-gel technology [ 24 , 25 ], layer-by-layer deposition (polyelectrolyte multilayers) [ 26 , 27 ], hydrothermal deposition [ 28 , 29 ], plasma spraying [ 30 , 31 ], laser cladding [ 32 ], electrochemical [ 33 , 34 , 35 , 36 ] and chemical [ 37 , 38 , 39 ] deposition, cold sprayed deposition, etc. [ 40 ]. However, these methods have disadvantages, such as process duration, the need for multiple applications, in some cases, the shrinkage of the final coating, as well as the use of a large number of solvents.…”

Role of Essential Oils and Bioactive Components for Manufacturing Cosmetic Items

“…TEWL on the skin of the back was found to be lower in the group that was treated with borage oil. In addition, there was no indication that any unfavourable outcomes were being experienced by these patients [159].…”

Eco-friendly approach for the fabrication of biо copper based superhydrophobic coating on steel metal and its corrosion resistance evaluation

“…The investigation into corrosion protection for metals and alloys has gained significant attention in recent years [ 27 ]. Various polymers, both thermoplastic and thermoset, including fluoropolymers, polypropylene, polyurethane, epoxy/silane, and polyetherimide, have proven effective as coatings for corrosion prevention [ 28 ].…”