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  • Sealing following anodizing of aluminium


Example flowsheet:

Scheme of different possibilities of surface treatment of aluminium:


Sealing following anodizing of aluminium.jpg

Literature: Oberflächenbehandlung von Aluminium; T.W. Jelinek; Eugen G. Leuze Verlag, D-88348; 1997


  • Typical parameters of the process
Process Temperature [°C] Chemicals Concentration [g/l] Residence time Details Literature
Sealing in nickel/cobalt- acetate solutions 70-90 1. Nickelacetate, 2. Cobaltacetate, 3. Boric acid, 4. Distilled Water 1. 5-5,8, 2. 1, 3. 8 15-20 min pH:5-6(optimum) Oberflächenbehandlung von Aluminium; T.W. Jelinek, Eugen G. Leue Verlag, D- 88348; 1997
Sealing in dichromate solutions 90-95 1. Kaliumdichromate and 2. Sodiumcarbonate OR 3. Sodiumhydroxide 1. 100, 2. 18, 3. 13 pH: 6-7
Sealing in dichromate solution 95-100 Sodium- or kaliumdichromate 50 30-60 min pH: 8-9; solution has to be free of chlorides and sulfates; maybe rinsing with water
Sealing in concentrated sodium-, kalium- or calciumsulfate/chloride solutions 90-100 Concentrated sodium-, kalium or calciumsulfate/chloride solutions 120-200 15-60 min pH:6,5-8
Cold sealing 25-35 Nickelfluoride, polar alcohol Ni: 1,2, Ni:F: 1,5:2 0,6-1 min pH: 5,5-6


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