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Abstract
An investigation has been conducted into the effectiveness of two ‘production-line’ post-sinter surface treatments, namely steam treatment and oil impregnation, as methods of improving the corrosion-resistance of ferrous powder-metallurgy parts. Electrochemical techniques and simple immersion tests followed by transverse rupture strength determination were used to evaluate corrosion behaviour in aqueous chloride and dilute sulphuric acid solutions. ‘As-sintered’ and wrought and machined parts were tested for comparison purposes.
In the chloride solution the corrosion-resistance of the treated parts was higher than that of either the as-sintered or machined parts, the steam treatment being particularly effective. In the acid solution, steam-treated parts showed the lowest corrosion-resistance of the four, with oil impregnation giving the highest resistance.
Notes
* Manuscript received 17 June 1974. Contribution to a Symposium on ‘Factors Affecting the Uses of PM Products’, to be held in Eastbourne on 28–30 October 1974.