Product Specification
ALZINCATE MD” 632
PRETREATMENT ZINCATING PROCESS PRIOR TO PLATING ON ALLUMINIUM
ALZINCATE MD-632 IS SUPPLIED AS READY TO USE SOLUTION.IT PRODUCES
THIN ADHERENT ZINC FILM ON ALLUMINIUM AND ALLUMINIUM ALLOYS,
WHICH MAY BE PLATED DIRECTLY WITH CYANIDE COPPER, NICKEL, BRASS,
SILVER, TIN, ZINC, CADMIUM OR CHROMIUM. UNDER COAT OF COPPER
STRIKE FROM A CYANIDE BATH IS ADVISABLE PRIOR TO FURTHER PLATING
FROM OTHER BATHS.
PROCESS SEQUENCE :
BY ADOPTING THE FOLLOWING PROCESS CYCLE, ALLUMINIUM AND ITS
ALLOYS CAN BE ELECTROPLATED.
1. SOAK CLEAN IN CLEANER MS-114 AT ROOM TEMPERATURE, TIME ONE
TO THREE MINITES .
2. RINSE IN COLD RUNNING WATER.
3. ACTIVATE IN NITRIC ACID (50% SOLUTION) AT ROOM TEMP, FOR 30
TO 90 SECONDS.
4. RINSE IN COLD WATER .
5. DIP IN ALZINCATE MD-632 SOLUTION AT ROOM TEMP. FOR 30 TO 60
SECONDS.
6. RINSE IN COLD RUNNING WATER.
7. 50 % NITRIC ACID DIP FOR 15 TO 30 SECONDS.
8. COLD WATER RINSE.
9. DIP IN ALZINCATE MD-632 SOLUTION AT ROOM TEMP. FOR 15 TO 30
SECONDS.
NOTE : IF NECESSARY THE SAME SOLUTION CAN BE USED FOR STAGES NO.
3 AND 7, ALSO 5 AND 9.
10. RINSE IN COLD RUNNING WATER (TWICE)
11. COPPER STRIKE ELECTROPLATING USING 75 GM/LIT OF CYNO COPPER
SALT-1150.
12. RINSE IN COLD RUNNING WATER.
13. FURTHER ELECTROPLATING AS REQUIRED.
OPERATION CONDITION OF MD-632 :
THE SOLUTION OF ALZINCATE MD-632 IS BEING SUPPLIED READY TO USE
AND IT IS ONLY NECESSARY TO POUR THE LIQUID IN TO THE M.S. OR
PLASTIC TANK. THE SOLUTION MUST BE KEPT WELL MIXED. THE TANK MUST
BE FITTED WITH AIR AGITATION PIPE OR ALTERNATIVELY THE SOLUTION
SHOULD BE STIRRED MANUALLY, DAILY, BEFORE USE.
MAINTENANCE :
THE SOLUTION HAS A LONG LIFE, IT MAY BE USED TO EXHAUTION AND
THEN DISCARDED AND A FRESH SOLUTION MADE UP. DRAG OUT LOSSES CAN
BE MAINTAINED BY ADDING FRESH MD-632 TO THE WORKING LEVEL.
GENERALLY IT IS POSSIBLE TO TREAT A MINIMUM OF 20 SQ. FEET OF
SURFACE PER LITRE OF MD-632 BEFORE IT IS EXHAUSED BUT IN PRACTICE
AREA UPTO 150 SQ. FEET ARE USUALLY ACHIEVED DEPENDING ON THE TYPE
OF ALLUMINIUM PROCESSED.