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Abstract
Visible passive films are formed on the surface of 1010 steel at 325 K in a solution of 1 N NaHCO3 + 1 N Na2CO3 at anodic potentials up to −320 mVNHE inclusively. For potentials below −400 mV, they are dull and contain FeCO3. For −(390–320) mV, the films are thin blackish bright. Most probably, the diffraction peaks are caused by Fe3O4–Fe2O3. For −(430–400) mV, the films are dull blackish. Probably, this color is caused by a composite of magnetite and siderite.
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