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Abstract
An attempt has been made to depress the tritium sorbability (ad- and ab-sorbability) of the surface of stainless steel by a method of chromium diffusion coating. The chromium layer was generated on a stainless steel surface from mixed powders of metallic Cr, NH 4Cl and Al 2O 3 in an Ar atmosphere. The surface layer formed under an optimum condition, to provide an effective surface in suppressing the sorption of tritium, was determined to be roughly 1.5 μm in thickness. The surface layer was constituted of an outer layer of deposited chromium that was covered with very thin passive film and an inner diffusion layer which was formed by a mutual diffusion of the deposited chromium and the constituents of stainless steel. These results led to the conclusions that the diffusion coating of the surface with chromium brought the chemical stability and probably the higher density of surface layer, and that the resulting thin stable double layer was realized as a durable and tritium-resistant surface of stainless steel.
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