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Pre-Treatment For G.I. Sheets

Degreasing

:- Removal of Oil & carbonaceous deposits from surface.

PRODUCT NATURE CONC. TIME TEMP.
KLINOL / ALKLIN SERIES ALKALINE DEGREASING POWDER 5% w/v 5-10 MIN RT TO 65°C
OLOSOL B ACIDIC LIQUID 15-20% v/v 2-5 Min RT

Acidic Degreasing

:- Removal of white rust and oil from surface.

PRODUCT NATURE CONC. TIME TEMP.
RUSTOL SERIES EMULSIFIED ACIDIC LIQUID 10-20% v/v 2-5MIN RT

Activation

:- Gives compact & uniform coating of zinc phosphate

PRODUCT NATURE CONC. TIME TEMP.
MOD-SUP ALKALINE ACTIVATION 0.25-0.5% v/v 1-2 MIN RT

Zinc Phosphating

:- Light wt phosphate coating for paint adhesion

PRODUCT NATURE CONC. TIME TEMP.
PHOSCOAT TZ LIGHT WEIGHT TRI CATONIC ZINC PHOSPHATE 5% v/v 5 MIN RT TO 55°C

Passivation

:- Seals the pores of phosphate coating

PRODUCT NATURE CONC. TIME TEMP.
PASS CHROMIC ACID BASED CHEMICAL 0.1% v/v 1 MIN RT TO 80°C

Remarks

:- Heating the bath will help in faster drying

Chromatizing

:- As an alternative to zinc phosphate coating,chromate coating can also be used which although has lesser corrosion resistance than zinc phosphate. still the process is easy to operate & has least sludge formation & provides acceptable paint adhesion. This does not require activation and passivation steps (six tank process)

PRODUCT NATURE CONC. TIME TEMP.
GALVACHROM Y AMORPHOUS YELLOW COATING 1.5-2% v/v 2-5 MIN RT

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