"VJP has setup a new anodizing plant to accomplish customer orders on time. This page provides the details of the anodizing plant at VJP and also the process details for technical understanding."

Anodizing is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts. Anodizing increases corrosion resistance and wear resistance, and provides better adhesion for paint primers and glues than bare metal. Anodic films can also be used for a number of cosmetic effects, either with thick porous coatings that can absorb dyes or with thin transparent coatings that add interference effects to reflected light. Anodizing is also used to prevent galling of threaded components and to make dielectric films for electrolytic capacitors. Anodizing most closely resembles standard electroplating. When a reactive metal is suspended in an electrolytic bath as an anode and current is passed through the bath oxygen is produced at the anode surface. This oxygen reacts with the metal to form a thin oxide film that generates colors. The transparent oxide increases in thickness in relation to the amount of voltage applied. At any given voltage the oxide will grow to a specific thickness (i.e. color) and stop, having reached a stage where current will no longer pass.

Sulfuric anodize, commonly referred to as Type II anodizing, is formed by using an electrolytic solution of sulfuric acid at room temperature and a current density of 15 to 22 Amps per square foot. The process will run for 30 to 60 minutes depending on the alloy used. This will produce a generally clear coating, depending on sealing, a minimum of 8ìm thick. One third of the coating
square foot. The process will run for 30 to 60 minutes depending on the alloy used. This will produce a generally clear coating, depending on sealing, a minimum of 8ìm thick. One third of the coating

Value Additions

• Can handle large size parts
• Sizes of 4.5mx2 m.
• Coloring.
• Integrated paint shop.

VEE J PEE’s anodizing plant has a built in area of 5000 sq ft. This would be operated as a separate plant away from foundry premises.

The list of equipments and corresponding specifications are given below.

• Cleaning Tanks-16x3x6 ft
• Anodizing bath-16x3x6 ft
• Rectifier 1000 Amps, 32 volt
• Cooling Plant
• Double handed buffing machine
• Dyeing tanks

The most common anodizing processes, sulfuric acid on aluminium, produce a porous surface which can accept dyes easily. The number of dye colors is almost endless; however, the colors produced tend to vary according to the base alloy. Dyed anodizing is usually sealed to reduce or eliminate dye bleed out.

Alternatively, metal can be electrolytically deposited in the pores of the anodic coating to provide colors that are more lightfast. Metal dye colors range from pale champagne to black. Bronze shades are commonly used for architectural use. Alternatively the color may be produced integral to the film. Splash effects are created by dying the unsealed porous surface in lighter colors and then splashing darker color dyes onto the surface. Aqueous and solvent based dye mixtures may also be alternately applied since the colored dyes will resist each other and leave spotted effects.

Anodizing is an environmentally safe electrochemical process that converts the aluminum metal surface into a porous aluminum oxide, ultimately creating an end product whose finish is more durable and weather-resistant. Anodized products and components are used in thousands of commercial, industrial and consumer applications. Structural Building exteriors, roofing, window frames, and door handles.

Appliances
Microwaves, Refrigerators, Dryers and grills.

Transportation Car parts, Boats, Aerospace Vehicles

• Grid blasting – 4x2 m (max size)
• Welding – Aluminium TIG welding
• Cutting Machine
• Portable grinder
• Handling equipment and Packing facility