Abstract
Surface composition changes by incident atomic hydrogen have been investigated on Inconel samples. The samples have been exposed to thermal atomic hydrogen at temperatures of 100–400°C and have been analyzed using Auger electron spectroscopy. Carbon, oxygen, and sulphur are the main impurities. At sample temperatures from 100 to 300°C, the carbon concentration is significantly reduced by incident atomic hydrogen. An apparent cross section of this process has been determined. It increases from 110 to 170°C by two orders of magnitude and is independent of temperature above 170°C, being 2 × 10 −17 cm 2 . At 400°C carbon migrates into the bulk. The disappearance of carbon is accompanied by the appearance of sulphur. We ascribe the appearance of sulphur at temperatures up to 300°C to chemisorption-induced segregation. A relatively slow removal of oxygen was generally observed.
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