The results obtained in the research work on the electrochemical and corrosion behaviour of metals after surface modifications caused by directed energy sources, that is ion implantation and pulsed laser irradiations, are presented. The following investigations were made: (a) The corrosion behaviour of nitrogen and boron implanted iron at various surface concentrations, in sulphuric acid, chloride ions containing solutions and borate buffer solutions, (b) The electrochemical and corrosion behaviour of aluminium after pulsed laser irradiation.