Abstract
The photoenhanced oxidation of several types of stainless steels under high flux (about 2 MV m −2) visible-UV irradiation has been investigated. Oxidation rates were studied under photoirradiation with both a broad-band xenon discharge source and a variety of lasers. Substantial enhancement of oxidation was observed for all photoirradiated samples as compared with reference samples oxidized under similar conditions but with IR heating. A quadratic dependence on photon flux was obtained for the oxide thickness over the flux range 0–2 MW m −2. A threshold wavelength for the oxidation enhancement was found at about λ = 410 nm. The enhanced oxidation under photoirradiation is believed to result from the photoreduction of the antidiffusion barrier oxides Cr 2O 3 and FeCr 2O 4 otherwise found under IR heating. This photoreduction of the barrier oxides was found to occur at wavelengths consistent with the threshold wavelengths ( λ = 400–425 nm) for the photodesorption of CO and CO 2 from stainless steels, indicating that the two events are intimately related.
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