ASTM B482-85 pdf free

04-16-2021 comment

ASTM B482-85 pdf free.Standard Practice for Preparation of Tungsten and Tungsten Alloys for Electroplating.
This practice makes recommendations of several reported practices for electroplating on tungsten and its alloysalong with comments as a guide in the selection of a processingmethod for a given application. Because data on methods andresults of evaluation with electroplated coatings on tungstenare limited, a recommendation of one method over anothercannot be made.
This standard does not purport to address the safetyconcerns, if any, associated with its use. lt is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.
The several processes reported for electroplating ontungsten can be classified as either ( l) providing asdepositedadhesion of the coatings or (2) depending on diffusion alloybonding to provide such adhesion. Appraisal of the relativemerits of these processes depends on the application for thecoating.
The need for descaling, solvent cleaning, and alkaline-soak cleaning of tungsten is dictated by the degree of cleanli-ness of the surface to be coated. Remove gross scale andsurface imperfections by mechanical means. Remove greaseand oil by organic solvents. Remove saponifiable and dispers-ible surface dirt by soak cleaning in a hot alkaline cleaner.2.2.2 Anodic treatment of tungsten surfaces in a 5 to 25mass % sodium hydroxide solution at 71 6°C and 16 to 25A/dm2 can be used to remove undesired surface metal.Anodicetching in a 10 mass % hydrofluoric acid electrolyte at24 3C and 5.4 A/dm2can be used to remove light scale andundesired surface metal before activation and electroplating oftungsten.
Two alternative meth-ods are presented below. The selection of one process over theother should be based on preliminary experimentation. Bothprocedures produce as-deposited adhesion of electroplatedmetals on tungsten.Treat the precleaned tungsten in a hydrofluoric acid electrolyte (30 10 mass % HF) at 24 3C,using 2 to 5 V, 60-Hz ac, and 2 to 5 A/dm2 for 1 to 2 min.Eitherdivide the work between two work rods or make one electrodeof platinum. After rinsing, the work is electroplated in acidelectrolytes.ASTM B482 pdf download.

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