» Pretreatment for Al Casting Material
DEGREASING :- Removal of oil, grease & oxide layer from aluminium surface.
PRODUCT |
NATURE |
CONC. |
TIME |
TEMP. |
ALKLIN LD/LDS |
Alkaline Degreasing |
5% w/v |
10-15 min |
RT to 65°C |
OLOSOL SERIES |
Acidic Degreasing |
25-33% v/v |
5-15 min |
RT |
Remarks :-
- For light to heavy oil, light duty ALKLIN chemicals can be used. Desmuting step is compulsion with ALKLIN LD/LDS if used for heavy oil components. The same may be omitted for light oil.
- For light to medium oil, OLOSOL SERIES of chemicals may be used. This does not require desmuting process. Articles should not be kept in this series of products for very large amount of time.
DESMUTING :- Removal of oil, smut and oxide layer from surface – optional step.
PRODUCT |
NATURE |
CONC. |
TIME |
TEMP. |
DI CLEANSER |
Combined degreasing - desmuting |
2-5% v/v |
2-5 min |
RT |
Degreasing can also be omitted, as this has combined degreasing – desmuting properties.
Articles should not by any chance be kept in this series of products beyond specified period of time.
CHROMATING :- Gives amorphous chromate coating on aluminium surface.
PRODUCT |
NATURE |
CONC. |
TIME |
TEMP. |
ALCHROM Y |
Yellow Chromate Coating |
1.5% v/v |
5-7 min |
RT |
This coating prevents oxidation of aluminium die casting material and gives the necessary adhesion required for painting or powder coating.
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