Coating of Ni–Al–N ions on Nimonic 75 alloy by 4 kJ plasma focus device

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 8008C. Improvement of charge transfer resistance by electrochemical impedance spectroscopy reveals that the coated layer can significantly increase resistance to corrosion.