Characterization of electrodeposited Nickel-Cobalt selective black coating using electron probe micro analysis

This paper reports on the method of characterization of electrodeposited nickel-cobalt selective black coating through the method of Electron Probe Micro Analysis (EPMA). Qualitative and quantitative elemental analysis have been carried out to identify and estimate elements present in the coating. In this study the ratio between the Kα and Kβ X-ray peak intensities of an element has been taken as a representative of the chemical state of the element in a sample. This analysis reports that the nickel-cobalt selective black coating has the elements nickel, cobalt and oxygen as major constituents and sulphur in traces. It has been found that nickel and cobalt are in mixed state, i.e. elemental as well as oxidized stat