ON THE FORMATION OF NOT COMPLETELY WEAR-RESISTANT COATINGS ON THE ANODIC OXIDE FILM WHEN ADDING CERTAIN DYES TO THE SEALING BATH.
Abstract
The report discusses the phenomenon of seal-action of certain dyestuffs added in small amounts to the sealing bath. It was confirmed that the seal-action can be related in all dyestuffs concerned to their molecular constitution. For their respective bahavior are responsible certain specific chelate-forming groupings in the dyestuff molecule. Corresponding to these groupings, all seal-active dyestuff were subdivided into four classes. Dyestuffs with these groupings are capable of entering into a metallic complex during the sealing process with the not wear-resistant coating formed on the surface of the anodic film. It is most probable that the aluminum-complex dyestuff thus formed becomes water-soluble. This is the reason why this process produces after sealing always a shiny and wear-resistant anodic oxide film where the surface of the latter is completely free of not wear-resistant reaction products. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1966
- Accession Number
- AD0635648
Entities
People
- F. Modic