Abstract
In this paper, the deposition of Ni–Al–N coatings on Nimonic 75 substrates using a 4 kJ plasma focus device for 30 shots is investigated. The results obtained by field emission scanning electron microscopy and X-ray diffraction (XRD) tests confirm the formation of Ni–Al–N nanoparticles on the surface of the samples with an average crystalline size of ∼20-50 nm. The hot corrosion rate was determined by measuring the weight gain of the samples at 800°C. Improvement of charge transfer resistance by electrochemical impedance spectroscopy reveals that the coated layer can significantly increase resistance to corrosion.
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