Abstract
Variations in water adsorption on stainless steel surface were measured at the National Research Laboratory of Metrology (Japan) by weighing 1-kg weights in vacuum and in humid air. For this measurement, a vacuum balance with a maximum capacity of 1.2 kg and a resolution of 0.1 μg was used. The dependence of water adsorption on washing and relative humidity of air was investigated respectively using a weight composed of 9 disks with a total geometric surface area of 668 cm2. The amount of water adsorption per unit area was 0.18 μg/cm2 before washing, and 0.15 μg/cm2 after washing at a relative humidity of 50%. The coefficient of relative humidity dependence was measured to be about 0.0075 μg/ (cm2· %). The effect of coating with TiN was also investigated. The decrease in water adsorption due to TiN coating was about 0.014 μg/cm2.
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