The oxidation of samples of 2.25Cr-1Mo steel covered with boric oxide in dry flowing oxygen has been studied at 600°C. For all times up to 100 hours of exposure, the steel with a borate layer at the original metal-oxygen interface gains less weight than an untreated specimen. The presence of boron also modifies the grain structure of the magnetite layer formed, giving a fine equiaxed microstructure with less porosity.
National Association of Corrosion Engineers
1989
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