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- W2470293756 abstract "Experimental studies carried out in this work have shown that pitting corrosion of nickel in chloride containing borate buffer solution of pH 9.2 is inhibited by white light at a power density of 180 W/M{sup 2} (200-900 nm wavelength), resulting in a shift in the breakdown potential in the positive direction by 34{+-} 8 mV compared with that in the dark. A similar anodic shift in the breakdown potential (by 47 {+-} 9 mV) was found for 70Cu30Ni (CA-715) in a similar medium under the same conditions of illumination. The number of pits initiated under illumination for the same time of observation was reduced by a factor of 3 {+-} 1 for both materials. Similar experiments on Type 304SS (SS304) in neutral, 1M NaCl solution using monochromatic UV light of {lambda} = 300 nm at a power density of 0.585 W/M{sub 2} showed an even stronger inhibitory effect of electromagnetic radiation. In this case, the breakdown potential was shifted in the positive direction by {approximately} 95mV, and the number of pits observed on the surface was reduced by a factor of more than 20, on irradiation. The effect of light on passivity breakdown, as observed in this work, has beenmore » accounted for by the Point Defect Model (PDM) for passive films that was developed earlier by some of the authors of this study. The current observations indicate that illumination of Ni and CA-715 with white light quenches the electric field in the barrier layer of the passive film by a factor of two to four, whereas for SS304, illuminated with higher energy photons but at a lower power density (0.585 W/M{sup 2} vs 180 W/M{sup 2}), the electric field was estimated to be quenched by a factor of about 85. Indeed, we are particularly encouraged by the prospects of developing photoinhibition as a means of protecting components in power plant steam cycle systems, which are enclosed in metal boundaries that effectively exclude light.« less" @default.
- W2470293756 created "2016-07-22" @default.
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- W2470293756 date "1994-11-01" @default.
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- W2470293756 title "Photo inhibition of localized corrosion. Final report" @default.
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