Pickling

Pickling is used to remove impurities from the surface of a component. The pickling process involves submerging the component in an acidic solution known as 'pickle liquor', which eats away at any impurities on the component's surface. Pickling is often used to remove oxide, rust and staining resulting from other production processes - especially those that involve the application of extreme heat.

Pickling is favoured for being a simple, yet effective process that can be used on a wide range of metals. Stainless steel, steel alloys, aluminium, copper, bronze, carbon steel and brass can all be pickled; however, some materials may become brittle due to the acidic nature of the pickling liquor used. This can result in cracking.

Pickling is commonly followed up with a process known as oiling, whereby oil is applied to the component's surface. This is done to prevent corrosion, which can occur following the exposure of a component to the atmosphere after the pickling process.

Used to produce

Components that are free from surface impurities such as oxide, rust and staining.

Materials

Examples of metals that can be pickled include stainless steel, steel alloys, aluminium, copper, bronze, carbon steel and brass.

Advantages

Removes impurities from the surface of a component.
Simple, yet effective method.
Can be used to counter the effects of other production processes on a material, especially those involving the application of extreme heat.

Disadvantages

Some materials may become brittle due to the acidic nature of the pickling liquor used. This can result in cracking.
Materials can corrode once exposed to the atmosphere following the pickling process. This is prevented with a process known as oiling, whereby oil is applied to the surface of the pickled component.

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