Thin magnetic films of Co‐P were prepared in two somewhat different electroless cobalt solutions. The magnetic properties and the corrosion behavior of these films as a function of thickness was studied. The films exhibited high coercivities with a maximum of about 1000 oe at a thickness of 600Aå. The magnetic moment of these films was found to decrease on exposure to high humidity and moderate temperatures (40°–70°C); this was used as a means of studying the extent of corrosion. The extent of corrosion was found to vary as the 2/3 power of the thickness of the film.
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Judge et al. (1965) studied this question.