NRDC Technology offer-COPPER BOTTOM STAINLESS STEEL UTENSILS

PLANT PARAMETERS
Capacity, Nos./Yr.	28800
No.of Shifts / day	1
Working days / Yr.	300
Land Area, m2	200
Covered Area, m²	150
MANPOWER
Managerial	1
Skilled	6
Unskilled	10
RAW MATERIAL (Tonne per 1000 No.of Product)
Nitric acid (Tech.)	0.04
Hydroch. acid (Tech.)	0.1
Copper. sulphate	0.03
Copper Anode	0.1
Sulphuric acid (C.P. grade)	0.004
Hydrocl. acid (C.P. grade)	0.04
UTILITIES (Per 1000 No of Product)
Power, KwH	1400
Process Water,KL	350
Raw Water, KL	520
PLANT & MACHINERY
Rectifiers	FRP Tank
Elec.Heater	Filter unit
Copper busbars	Buffing wheel
Polishing M/c	Grinding wheel

Stainless Steel Vessels because of its corrosion and tarnish resistance properties are widely used and preferred to copper and brass vessels. Periodical turning of the interior surface of the stainless steel vessel is not required as in the case of copper and brass vessels. Inspite of these advantages stainless steel is a poor thermal conductor and also lacks uniform heat dissipation resulting in substantial heat loss. These draw-backs can easily be eliminated by depositing a suitable metal having good thermal conductivity with sufficient thickness on the part of the vessel coming direct contact with the flame or hot plate.. The coated metal not only boosts the conductivity of the composite stainless steel vessel but also eliminates hot-spots.

Metals such as silver, copper, brass, aluminium, tin may be considered as good coating metals on stainless steel but copper is favoured in consideration to its cost, availability, conductivity, hardness, ease of applications on stainless steel etc.

In order to overcome the drawbacks of the conventional method, a process has been developed successfully. The new process envisaged the direct plating of copper on stainless steel from an acidic copper chloride bath.

QUALITY OF THE PRODUCT

The specification for the coating of metal by Bureau of Indian Standards is 0.5 mm (500 microns).

PROCESS

In conventional method of coating, a nickel strike coating from wood's nickel bath is given on stainless steel surface before copper plating. There are several disadvantages in using nickel as an undercoat for copper namely:

Nickel and its salts are costlier;
Any defect on the nickel plate is not easily visible.
Passivation of nickel poses a problem and gives higher percentage of rejects.
The activation of passive nickel coating is practically not possible.

The process offered overcomes the disadvantages of these strike bath. The bath used in the process is copper (ii) chloride is found suitable for large scale production in industry. The adhesion of copper on stainless steel is excellent and another added advantage is that it is operable at room temperature. After this strike from copper (ii) chloride the stainless steel is further coated with copper from copper sulphate bath. The portions not required to be plated are covered with wax or cello tape.

National Research Development Corporation, a Government of India Enterprise, is a premier technology transfer Corporation with four decades of experience. It has helped establish over one thousand projects in the small and medium scale sector.

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