Accession Number : AD0756472

Title :   A Radiochemical Technique for Determining Depth Distributions in Mo,

Corporate Author : MCMASTER UNIV HAMILTON (ONTARIO) INST FOR MATERIALS RESEARCH

Personal Author(s) : Arora,M. R. ; Kelly,Roger

Report Date : 05 OCT 1971

Pagination or Media Count : 6

Abstract : Molybdenum can be anodized at up to 235V in an electrolyte containing glacial acetic acid, Na2B4O7.10 H2O, and water. The resulting oxide films, which must be stabilized by compressed-air drying, show brilliant interference colors, have a linear (or nearly linear) thickness-voltage relation, and can be formed with thicknesses of up to 380 microgram/sq cm of oxide. When exposed to 1.0 g/litter aqueous KOH, the films dissolve (strip) within 30 sec, whereas the underlying metal dissolves at a rate of only 20 A/hr. The film thicknesses formed on Mo which has been subjected to Kr ion bombardment are similar to those on unbombarded specimens. It follows from these results that the use of an anodizing-stripping sequence for determining depth distributions in Mo should be possible. Examples of depth distributions for 10-keV Kr are given and are shown, by comparison both with theory and with previously obtained results for W, to be numerically plausible. (Author Modified Abstract)

Descriptors :   (*OXIDES, *ION BOMBARDMENT), (*ANODIC COATINGS, *THICKNESS), (*ION BOMBARDMENT, THICKNESS), MEASUREMENT, KRYPTON, RADIOCHEMISTRY, CALIBRATION, ELECTROCHEMISTRY, CANADA

Subject Categories : Physical Chemistry
      Coatings, Colorants and Finishes

Distribution Statement : APPROVED FOR PUBLIC RELEASE