Effect of Gold Coating on Sorption Characteristics of CO, Sulphur, and Other Gases on Stainless-Steel Sheet

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Abstract
Auger electron spectroscopic observations of the vacuum-deposited gold surface in comparison with bare stainless-steel surface have been made under varying vacuum conditions. The C and O peaks for the gold surface were negligibly small whereas those for the bare surface were rather intense and increased with time of exposure to primary electron bombardment. Decrease of the sulphur peak with increase of C and O peaks was observed for the bare surface which suggests that the impurity sulphur located on the stainless steel surface is covered by an adsorbed CO layer. Sulphur is the dominant impurity on a stainless steel surface after 700 °C flashing, but a very weak sulphur peak is observed for the surface covered by approximately 10 layers of vacuum-deposited gold film. Migration of sulphur from a bare stainless-steel surface to the gold-covered part of the surface has also been observed as a function of temperature.