Investigation of Nanocrystalline Co–P Coated by Pulsed Electrodeposition

In this study, nanocrystalline Co-(1–2)wt %P coatings were obtained by pulsed electrodeposition method on 1.6959 steel substrate. Coating operation carried out with current density of 150 mA/cm² on the basis of the preliminary studies and tests, coating was accomplished in 5 different pulsed current. XRD studies and EDX analysis results showed that the coatings all had the same phosphorous-cobalt composition with Co-1.5% P. XRD studies demonstrated the amorphous structure in all coatings. Heat treatment on the coatings showed that annealing the coatings at 400°C for 1 hour causes development of crystal nanostructure coatings and increases the hardness. XRD studies on nanocrystal coatings prove that the least size of the Nano grains belongs to coatings with higher off times. Heat stability of the coatings was proved with the help of DTA experiments on coatings up to 650°C.