The use of the light material aluminium has but a short history in comparison with other much used materials such as iron, copper, tin and gold. Aluminium was discovered at the start of the 19th century, and only became widely available for industrial use at the start of the 20th century. Barely 100 years later it is impossible to imagine life today without aluminium. It has proved to be a common, widely applicable and durable material that can be used for various purposes in highly diverse products. Aluminium is a base metal that can protect itself in non straining conditions with its own natural (oxide) corrosion layer. In many cases aluminium is pickled because the surface has become contaminated with grease, oil and atmospheric pollution and possibly initial corrosion (aluminium oxides). To remove these contaminations it is necessary to degrease and pickle the aluminium.
- Oxygen cleaning