Abstract
ABSTRACTThe paper describes the microstructure and corrosion investigations of nickel-nano-alumina-polytetrafluoroethylene (Ni/Al2O3/PTFE) composite coatings produced by the electrochemical method in a Watts bath modified with saccharin and in its base variant. The structure studies were performed by Scanning Electron Microscopy, Transmission Electron Microscopy, X-ray Diffraction and sin2ψ methods. The nickel and Ni/Al2O3 coatings were also analysed for the comparison purpose. The corrosion studies were performed by the potentiodynamic method in two anti-icing environments: sodium chloride (NaCl) and calcium magnesium acetate (CMA). The studies have shown that the Ni/Al2O3/PTFE coatings produced in the base Watts bath have higher corrosion resistance (525,5 kΩ) in a NaCl solution compared to the other investigated coatings The microstructure studies before and after the exposure to corrosion environments have shown that all the coatings tested in NaCl were characterised by pitting corrosion. In contrast, the coatings exposed to the CMA have shown the slight change in morphology.
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