A potentiodynamic study has been made of sintered 434L ferritic stainless steel compacts containing 6 vol-% Al2O3 and various amounts (0–3 wt-%) of phosphorus, added as Fe2P. The tests were carried out at room temperature in 1N H2SO4. The resutts show that the passivation properties of the stainless steel compacts are superior to those of any of the other compacts tested. It was, however, found that composite compacts containing 3 wt-%P, for which the porosity was at a minimum, exhibit better passivation properties than composite compacss with lower phosphorus contents, these properties approaching those of the sintered 434L stainless steel compacts.
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