The electrochemical behaviour of a sensitised 304 stainless steel which has subsequently undergone a fusion treatment of its surface with a continuous wave CO2 laser has been studied. The area directly affected by the fusion has a fine scale microstructure of austenite; the intercellular regions are interpreted as containing ferrite. The electrochemical corrosion resistance tests show that, following the laser treatment, the steel has regained its intergranular corrosion resistance properties.
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