» Process for Color Anodizing
DEGREASING :- Removal of oil, grease & oxide coating from aluminium surface.
PRODUCT |
NATURE |
CONC. |
TIME |
TEMP. |
ALKLIN HD |
Alkaline Degreasing |
5% w/v |
5-15 min |
RT to 65°C |
ETCHING :- Chemical finishing of degreased aluminium surface.
PRODUCT |
NATURE |
CONC. |
TIME |
TEMP. |
ALCLEANSER |
Acidic Etching |
3-5% v/v |
10-15 min |
RT |
DESMUTING :- To remove traces of black smut left .
PRODUCT |
NATURE |
CONC. |
TIME |
TEMP. |
NITRIC ACID |
- |
5% v/v |
2-5 min |
RT |
ANODIZING :- Electrochemical Conversion process leaving porous oxide coating on aluminium surface.
PRODUCT |
CONC. |
TIME |
VOLTAGE |
CURRENT DENSITY |
TEMP. |
SULFURIC ACID |
180-200 gm/lit |
30 min |
14 to 18 V D.C. |
10 – 15 A / Sq. Ft. |
15 -20°C |
COLORING :-
Electrolytic Coloring – Electro deposition of metallic color particles into the anodic coating.
PRODUCT |
NATURE |
CONC. |
TIME |
VOLTAGE |
TEMP. |
ALCOL - P |
Metallic salt. |
10-15 gm/lit |
15 sec to 15 min depending upon the colour shade required. |
14 to 18 V A.C. |
18 -25 °C |
ALCOL ST |
Colour stabilizer & throwing power improver |
18 gm/lit |
ALCOL L201 |
Liquid with combined colour and stabilizer. Easy to use. |
6% v/v |
SULFURIC ACID |
- |
18-20 gm/lit |
SEALING :- Seals the pores of anodic coating.
PRODUCT |
NATURE |
CONC. |
TIME |
TEMP. |
ALSIL 71 |
Impregnating metallic salts |
5 gm/lit |
0.5-1min/micron of anodic coating |
25 to 30° C |
|
