Metal surface finishing treatments are aimed at enhancing the appearance, durability and functionality of metal components. Here are six common surface finishing treatments which are used in manufacturing processes.
Electroplating
Electroplating is a widely employed surface finishing technique which has been used since the 19th century. It involves the deposition of a thin layer of metal onto a surface through an electrolytic process with the metal to be plated being used as the cathode and the plating material as the anode.
Common metals used for electroplating include nickel, chromium, gold and silver. Electroplating provides excellent corrosion resistance and increased hardness to the metal.
Electroless plating
In contrast to electroplating, electroless plating does not require an external electrical current to deposit the metal. Instead, the process relies on a chemical reduction reaction. Electroless plating offers a uniform coating and is a cheaper method due to not using electricity.
Chemical treatment
Chemical treatments use a chemical reaction to create oxide and sulfide films which will then clean and modify the metal’s surface. Chemical treatments are particularly useful for stainless steel and other corrosion-resistant metals.
Anodic oxidation (anodising)
Anodising is a process that creates a controlled oxide layer on metals like aluminium and titanium. It involves immersing the metal in an electrolyte and applying an electric current.
Anodising improves abrasion resistance and corrosion resistance and provides a base for dyeing to achieve various colours. Information and advice on a variety of surface treatments including anodising can be obtained from specialists such as www.poeton.co.uk/standard-treatments.
Hot dipping
Hot dipping, also known as galvanising, is a surface finishing method commonly used to protect steel and iron from corrosion. Galvanising provides excellent corrosion resistance and is often used for outdoor applications such as fencing and construction.
Vacuum plating
Vacuum plating is a high-tech surface finishing technique performed in a low-pressure environment. Vacuum-plated coatings offer excellent wear resistance and decorative options, making them popular in industries like electronics and aerospace.
In conclusion, these six metal surface finishing treatments cater to various applications and protect metal components from wear, corrosion, and environmental factors.
