STRIPPING SALT – 1000
STRIPPING SALT-1000 IS AN ALKALINE POWDERED PRODUCT USED FOR STRIPPING NICKEL, COPPER, CADMIUM, ZINC AND SILVER FROM IRON AND STEEL BY SIMPLE IMMERSION. THE STRIPPING RATE DEPENDS UPON THE SOLUTION CONCENTRATION RATES VARYING FROM 0.5 MIL TO 2.0 MIL PER HOUR AT 60-65°C.
STRIPPING SALT-1000 CAN BE OPERATED MOST ECONOMICALLY AT ROOM TEMPRATURE. THE ARTICLES TO BE STRIPPED ARE SIMPLY KEPT IN THE SOLUTION AND ALLOW THEM TO STRIP IN OVERNIGHT.IF STRIPPING SPEED IS TO BE INCREASED, THE TEMPERATURE OF THE SOLUTION CAN BE MAINTAINED AT HIGH TEMPERATURE.
STRIPPING SALT -1000 SOLUTION WILL NOT ATTACK MOST STEEL AND IRON ALLOYS EVEN THOUGH THE WORK REMAINS IN THE SOLUTION FOR SEVERAL HOURS. BUT IF THE PARTS ARE PACKED TOO CLOSELY IN THE SOLUTION, OR IF EXCESS REPLENISHMENT HAS BEEN MADE TO AN AGED BATH, ETCHING OF THE BASIS METAL MAY OCCUR.
WORKING CONDITIONS
CONCENTRATION 150-170 G/1
TEMPERATURE 30-70° C
PREPARATION :
FILL THE TANK WITH 2/3RD FULL OF WATER AND HEAT THE WATER TO 50* C THEN ADD THE REQUIRED AMOUNT OF STRIPPING SALT- 1000 STIRRING TO DISSOLVE THE MATERIAL. ADD WATER TO BRING THE SOLUTION TO THE WORKING LEVEL.
OPERATION :
STRIPPING SALT-1000 DISSOLVES THE PLATED COATINGS BY SIMPLE IMMERSION THE PLATED WORK TO BE STRIPPED IS TO BE IMMERSED IN THE SOLUTION UNTIL THE COATING IS REMOVED COMPLETELY. AGITATION OF THE WORK WILL INCREASE THE STRIPPING SPEED AND HELP TO PREVENT ETCHING OF THE METAL. THE PARTS SHOULD NOT BE PLACED TOO CLOSE TO EACH OTHER SO AS TO PREVENT THE SOLUTION CIRCULATION BETWEEN THE PARTS.
IF THE WORK TO BE STRIPPED IS GREASY OR OILY, IT SHOULD BE CLEANED WELL BEFORE ENTERING THE STRIPPING SOLUTION.SMALL PARTS CAN BE ECONOMICALLY STIPPED IN AN OPEN-ENDED OBLIQUE BARREL. THE RATE OF STRIPPING IN BARREL IS MUCH BETTER WITH DILUTE SOLUTION THEN WITH THE MORE CONCENTRATED SOLUTION IN A STILL TANK.NORMALLY 30 G/L STRIPPING SALT-1000 SOLUTION IS USED IN BARRELS. THE SOLUTION MAY BE DISCARDED AFTER 2 OR 3 LOADS DEPENDING UPON THE THICKNESS OF NICKEL TO BE STRIPPED AND VOLUME OF PARTS.
EQUIPMENT :
PLAIN STEEL TANKS PROVIDED WITH M. S. STEAM COILS OR ELECTRIC IMMERSION HEATERS ARE SUITABLE FOR HOLDING STRIPPING SALT-1000 SOLUTION, JIGS BASKETS AND RACKS SHOULD BE MADE OF STEEL OR STAINLESS STEEL. EXHAUST VENTILATION IS RECOMMANDAD.
MAINTENEANCE :
WHEN THE STRIPPING RATE IS REDUCED DUE TO DRAG-OUT AND CONSUMPTION OF SALTS ADD 50 GM/LIT OF STRIPPING SALT-1000 TO SPEED UP STRIPPING. HOW EVER, AFTER TWO ADDITIONS, IT IS MORE ECONOMICAL TO DISCARD THE SOLUTION AND PREPARE A FRESH SOLUTION. ALSO IF THE BATH IS REPLENISHED WITH MORE THAN 140 GMS PER LITER WILL TEND TO ETCH THE STEEL.
THE SODIUM CYANIDE IN THE BATH DECOMPOSES GRADUALLY AT ELEVATED TEMPRATURE AND THE SODIUM CYANIDE CONTENTS SHOULD BE MAINTAINED AT 60 GM/LIT IN ORDER TO PREVENT THE ATTACK OF BASE METSL. THE FREE CYANIDE CONTENT CAN BE CONTROLLED BY THE FOLLOWING ANALYTICAL PROCEDURE.
PIPETTE 2 ML SAMPLE OF STRIPPING SALT-1000 SOLUTION INTO A 250 ML CONICAL FLASK AND ADD 100 ML OF COLD WATER. ADD 1/2 GM OF POTTASSIUM IODIDE AND TITRATE TO THE FIRST FAINT TURBIDITY WITH N/10 SILVER NITRATE SOLUTION.
FREE SODIUM CYANIDE G/L =______ ML. OF 0.1N SILVER NITRATE X 4.9.