| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.31 ( November 1994 ) Special Issue on 'Stainless Steel 'and ' Engineering and Construction' ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Effects of Cr, Mo and Cu on the Atmospheric Corrosion Resistance of Ferritic Stainless Steels in a Coastal Environment Yoshihiro Yazawa, Keiichi Yoshioka, Fusao Togashi |
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Synopsis : Effect of alloying elements on the resistance of ferritic stainless steels to atmospheric corrosion in coastal environment was evaluated by atmospheric exposure tests and laboratory corrosion tests. Atmospheric exposure tests showed that pitting corrosion resulted in rusting and that atmospheric corrosion resistance of the steels increased with an increase in Cr content and with addition of Mo and/or Cu. Ferritic stainless steels with higher Cr and Mo contents, such as 30Cr-2Mo steel, were also shown to have excellent resistance to atmospheric corrosion in coastal environment. Laboratory corrosion tests showed that Cr and Cu were effective in preventing the generation and growth of pits respectively, while Mo played a significant role in both processes. From the results of both atmospheric exposure and laboratory corrosion tests, it was concluded that steels with pitting potentials higher than the critical values, which depended on the aggressiveness of environments, exhibited no rusting. These critical values can be used as one of the criteria for selecting exterior materials of buildings in various areas. |
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