Texture Dependence of Corrosion of Mild Steel after Cold Rolling

Abstract

The dependence of the corrosion rate of mild steel on the deformation texture produced by cold rolling has been investigated. The individual corrosion rates were determined for surfaces which were either perpendicular to, or parallel to, the rolling plane, and the morphology of the corrosive attack was studied by optical metallography.

Corrosion is localised on the transverse faces and uniform on the longitudinal face. The apparent corrosion rate is highest on the short transverse face (where it is localised in the form of grooving) and lowest on the face parallel to the rolling plane. However, the true corrosion rate (per unit true area of exposed surface) is believed to be higher on the longitudinal face. The possible correlation between the corrosion behaviour of the individual faces and the deformation texture as determined by X-ray diffraction is discussed.