I am trying to find the best method to encourage adhesion of a wood alcohol based dye to 6061 aluminum. The results I have gotten have generally been a somewhat blotchy appearance, and a uniform appearance is desired. Current Method:
Place about 2K parts in a rotating tumbler with a spherical vessel of 2 gallons that has a 3.25" throated opening. Tumbler rotates a 40 rpms inject 1 tsp dye. parts are usually coated within 15 seconds once coated blow compressed air (50 psi) to dry parts. Parts are usually dry within 30 seconds. See results in picture
Would polarity affect adhesion? If so, how would one go about providing the correct polarity? Would heating the parts affect adhesion? Would hot air drying affect adhesion?