an investigation into the effects of controlling parameters on amorphous-nanocrystalline ni-p coating using taguchi method and evaluation of its thermal behaviour

in this study, nickel-phosphorus coating was prepared by electrodeposition technique on the 304 stainless steel substrate. the effects of current density, phosphorous acid concentration, time and ph on the phosphorous content was investigated using taguchi method. a uniform amorphous-nanocrystalline structure (ni-12%p) was obtained. sem, eds, tem and xrd were used in order to study the surface morphology, chemical composition and phase structure. based on the dsc results, the thermal behaviour of coatings with different phosphorus contents was analyzed and the relationship between the structure and temperature was determined. the results showed that at the temperature of 409.1 °c, the structure of coating (ni-2.51%p) changed from amorphous to crystalline with a greater thermal stability. the transformation temperature decreased to 328° c by an increase in the phosphorous content