Process for sealing an anodic coating obtained from a chromic acid bath.

摘要

To obtain simultaneously good corrosion resistance and good adhesiveness of the paint, the sealing of the oxide layer, obtained by chromic anodising, is performed under the following conditions: - bath composition: base: demineralised water, potassium or sodium dichromate: 8 to 12 grams per litre pH: adjusted to: 4.5 to 6.5 by a suitable addition of caustic soda. - bath temperature: 75 to 85 DEG C. - immersion time: sufficient to ensure a degree of hydration of the alumina coating of between 8 and 15 %. o