Microstructure and Corrosion Resistance of Aluminium and Copper Composite Coatings Deposited by LPCS Method

Abstract

The paper presents the study of microstructure and corrosion resistance of composite coatings (Al+Al2O3 and Cu+Al2O3) deposited by Low Pressure Cold Spraying method (LPCS). The atmospheric corrosion resistance was examined by subjecting the samples to cyclic salt spray and kesternich test chambers, with NaCl and SO2 atmospheres, respectively. The selected tests allowed reflecting the actual working conditions of the coatings. The analysis showed very satisfactory results for copper coatings. After eighteen cycles, with a total time of 432 hours, the samples show little signs of corrosion. Due to their greater susceptibility to chloride ions, aluminium coatings have significant corrosion losses.

X-ray diffraction and microstructural analysis of Cu–TiO2 layers deposited by cold spray

“…This method allows the chemical composition of coatings to be controlled and high-class coatings to be obtained [16]. Soft materials are most often used for spraying in the LPCS method, in which it is possible to obtain a strong plastic deformation that guarantees strong adhesion of the coating to the substrate and also a relatively low melting point [12,[17][18][19][20][21]. In the spraying process, it is possible to use a ceramic phase to obtain stronger compaction and break down of the oxide layer formed on the previously formed layer of the coating.…”

Properties of Cold Spray Coatings for Restoration of Worn-Out Contact Wires

“…In study [34], the corrosion behavior of low-pressure cold sprayed coatings Al-Al 2 O 3 on copper and Cu-Al 2 O 3 on aluminum is studied. The thickness of the coatings was just 300 µm, and no adhesion was examined.…”