Microstructure analysis of corrosion in iron based recording tapes

The advantage of using iron particles rather than the traditional oxides for high density magnetic recording has long been recognized. Little information on the corrosion resistance of iron based tapes has been available. This paper examines, phenomenologically, the corrosion of iron particles in both powder and tape form. The superior retention of magnetic remanence and coercivity of properly formulated iron tapes compared with commercially available CrO2tapes after accelerated aging tests is interpreted in terms of corrosion mechanisms.