Wire Shelving

Wire Shelving is becoming increasingly popular for use as industrial shelving. Wire shelving at its standard features encompasses:

• Four steel poles
• 7" to 8 feet in height
• Shelves that are usually between 18 - 30 inches deep and 2 - 6 feet wide.

The shelves have four holes on the corners where the poles are inserted and little plastic clips are used to keep them connected. Circular gloves are used to keep the shelves held together to the poles which are usually spaced one inch apart throughout its length, making it extremely easy for the individual shelves to be moved to any height when the unit is fully assembled without taking apart the unit or moving the other shelves.

   


Assembly or disassembling these shelves requires no tools although a rubber mallet is useful. Wire shelving is used in a broad range of commercial and home applications, retail outlets and industrial applications such as in restaurants, food service industries and factories due to its ability to stay clean and resist rust and mold. Wire shelving is increasingly being used in home kitchens as well. Wire shelving is excellent in areas where fire prevention is stressed because its open design allows sprinkler systems to function where sold shelving might block water flow.

Incompatible Standards and Labeling
Not all pole diameters and shelf widths in use are the same. The various plastic connectors are not interchangeable among manufacturers. Many use proprietary designs that do not fit with the systems of other makers. This variance tends to make it difficult to mix and match various brands of shelving.

Weight capacity ratings
Shelves are manufactured in many different weight limits from 150kg to 300 kg. It is important to note that most shelving is rated per shelf level for evenly distributed loads. The definition of a capacity rating may vary from manufacturer to manufacturer, and should be confirmed before shelving is used at or near its listed capacity.

Accessories:
Caster Sets, Wire Racks.


Chrome Plating

Chrome plating otherwise simply known as chrome, is a technique of electroplating a thin layer of chromium onto a metal object. The chromed layer can be decorative, provide corrosion resistance, ease cleaning procedures, or increase surface hardness.

Process
The component will generally go through these different stages.
• Degreasing to remove heavy soiling.
• Manual cleaning to remove all residual traces of dirt and surface impurities.
• Various pre-treatments depending on the substrate.
• Placed into the chrome plating vat and allowed to warm to solution temperature.
• Plating current applied and component is left for the required time to attain thickness.

This process has many variations depending on the type of substrate being plated upon. Different etching solutions are used for different substrates such as Hydrochloric, hydrofluoric, and sulfuric acids. Ferric chloride is also a popular solution for the etching of Nimonic alloys. When chrome plating is done, the component will be inserted into the chrome plating vat electrically live or the component will have a conforming anode either made from lead/tin or platinized titanium. A typical hard chrome vat will plate at about 25 micrometers (0.00098 in) per hour. Chrome plating chemicals are highly toxic and disposal of these chemicals are regulated under local laws in most countries.


Electro Plating

Electro Plating also known as electrochemical polishing is a process that removes materials from a metallic piece. Electro plating polishes, passivates and deburrs metal parts. The process of electro plating involves the metal piece immersed in a temperature controlled bath of electrolyte and connected to the positive terminal (anode) of a DC power supply, the negative terminal being attached to an auxiliary electrode (cathode). The metal on the surface is oxidized and dissolved in the electrolyte when a current passes from the anode. At the cathode, a reduction reaction which is normally a hydrogen evolution, takes place. The electrolytes commonly used for electro polishing are concentrated acid solutions that have a high viscosity such as mixtures of sulfuric acid and phosphoric acid. Other electro polishing electrolytes also frequently used include mixtures of perchlorates with acetic anhydride and methanolic solutions of sulfuric acid.

Process
There are two ways of achieving electro polishing. The first is when the protruding parts of a surface profile are dissolved faster than the recesses. This is achieved by applying specific electrochemical conditions which usually involves a mass transport limited dissolution reaction. The second way of electro polishing is by making sure that the surface heterogeneities due to crystal orientation in a polycrystalline material are suppressed and that no pitting occurs. These conditions, often associated with surface brightening, are usually fulfilled with the above mentioned polishing electrolytes and with proper process control.

Application
Electro polishing is popularly used in the metal finishing industry because of its simplicity and it can be applied to objects of complex shape. Some of the products of electro polishing are stainless steel drums of washing machines and stainless steel surgical devices. Electro polishing is also used in the preparation of thin metal samples for transmission electron microscopy. This is because electro polishing does not cause mechanical deformation of surface layers that usually occurs when mechanical polishing is used. Anodic dissolution under electropolishing conditions deburrs metal objects due to increased current density on corners and burrs. Ultra High Vacuum (UHV) components are typically electro polished in order to have a smoother surface for improved vacuum pressures, outgassing rates, and pumping speed.


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