Effects of Sol‐Gel Coatings on the Localized Corrosion Behavior of 304 Stainless Steel
- 1 April 1997
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 144 (4) , 1307-1310
- https://doi.org/10.1149/1.1837589
Abstract
The corrosion behavior of ceria/titania coated 304 stainless steel (304 SS) was studied by anodic polarization measurements in 0.05 N NaCl. Coatings were prepared by sol‐gel methods, were approximately 0.5 μm thick and bonded well to the substrate. The as‐received stainless steel suffers sensitization at the coating cure temperature of 900°C and a 500 mV decrease in pitting potential results. When the coating is present, however, despite sensitization of the substrate, the pitting potential is about the same as for the as‐received stainless steel. The latter result indicates that the coating does protect the underlying metal from pitting corrosion. Following polarization, coated samples show significantly fewer pits than as‐received stainless steel and resist crevice attack.Keywords
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