THE AIM IS TO DEMONSTRATE THE INFLUENCE OF THE ELEMENTS CR AND SI ON STEEL CORROSION IN THE ATMOSPHERE AND IN SEAWATER, AND IN PARTICULAR THE INFLUENCE OF DIFFERENT CHROMIUM CONTENTS ON THE BEHAVIOUR OF STEEL IN SEAWATER.

EARLIER RESEARCH HAS SHOWN THAT CHROMIUM AND ALUMINIUM HAVE A FAVOURABLE EFFECT ON CORROSION IN SEAWATER BUT THIS ADVANTAGE DOES NOT EXTEND TO SPLASH AND TIDAL ZONES. IT IS POSSIBLE THAT SILICON COULD PROVE ADVANTAGEOUS IN ALL THREE REGIONS. IT IS THEREFORE NECESSARY TO DETERMINE THE OPTIMUM CONTENT OF SILICON AND THE BEST COMBINATION OF THE THREE ELEMENTS CR, SI AND AL. THE INFLUENCE OF THESE ELEMENTS AND OF CATHODIC PROTECTION ON THE BEHAVIOUR (HARDNESS) OF THE HEAT-AFFECTED ZONE IN WELDED CONNECTIONS WILL ALSO BE EXAMINED.