A Process for Rapid and Fast Colouring and Anodized Aluminium and its Alloys
Introduction
The process is economical, rapid and produces fast colours ( which do not fade in sun light as organic dyed colours). The finishes are fault free, uniform and corrosion resistant. In the process, aluminium is pre-treated and anodized in sulphuric acid with direct current. Subsequently, fast colours are obtained by a simple immersion of the anodized aluminium article in an acidic solution containing metallic salts and application of alternating current for a few seconds only
Major raw materials
- Sulphuric acid
- Sodium hydroxide
- Inorganic chemicals
Major Plant Equipment/Machinery
- DC Rectifier,
- Pre-treatment, anodizing, colouring and storage tanks,
- AC power transformer,
- Deionizing plant,
- Refrigeration plant,
- Steam generator,
- Cables/Exhaust etc. costing Rs. 5.00 lakhs (approx.) All are indigenously available
Area of Application
Minerals, Metals and Materials
Applications
Finds major application and handicrafts, giftware, novelties, home appliances, architecture items, such as curtain walls, panels, window frame, roofing materials etc. and also black anodized finishes for solar cookers and solar selective coatings for efficient utilisation of solar energy.
Status of Specific Development
The process is standardised at a scale of 15 cm x 15 cm panel and 5 litre solution and tested in a commercial anodizing plant
Ecological/Environmental Impact
Effluent generated during the process need to be treated before disposing off
Technology Transfer Assistance Offered
Includes
- Process know-how
- Details of the equipment
- Plant lay-out
- Quality assurance methods. Assistance in setting up the plant and separate terms
Additional Information
A plant with capacity to process 24,000 dm² area per day (3 shifts) costs approximately Rs. 10.00 lakhs. Ideally suitable for small scale for modernising running anodizing shops
For further information please contact :
Director
National Metallurgical Laboratory
Jamshedpur-831 007, India
Tel: (0)657-2271715, 2270092
Fax:(0)657-2270527
Email: director@nmlindia.org
