Electroless nickel (EN) coatings varying in occluded phosphorus were c
haracterized using scanning tunneling (STM), electron microscopy (EM)
and X-ray diffraction (XRD). Low-phosphorus (1 to 3 percent) EN coatin
gs were crystalline and exhibited rounded mounds surrounded by fairly
deep crevices. Medium- (4 to 7 percent) arid high-(more than 9 percent
) phosphorus deposits were generally amorphous and smooth. The effect
of a small applied current on the structure was also determined.