Abstract

A. Hamdy*, Khaled Z. Mohammed, Mohamed A. Abbas and Al-Sayed M. Aly

Comparison of corrosion behavior of Ni, Cu and 70/30 Ni-Cu alloy together with that of carbon steel in seawater has been investigated. Characteristics such as morphological changes and composition of corrosion products have been studied comparatively by means of scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and X-Ray diffraction (XRD). It was found that both the protective properties and adherence of the film, formed on the surface depend on the nature of the substrate and the environment composition. Corrosion mechanisms for all the studied materials were suggested based on the surface analyses. The results show that the chloride content is the controlling factor in corrosion of both carbon steel and copper in seawater, while sulphur content is the regulating factor for corrosion of nickel and 70/30 Ni-Cu alloy in seawater.

Corrosion; Carbon steel; Sea water

[ View HTML Full Text]