P - Aluminium glossary

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Particle-reinforced materials

Particle-reinforced materials (PRMs) are aluminium composite materials. Particle reinforcing (such as a dispersion of silicon-carbon particles)...

Periodic table

The chemical elements from which all substances are made are described and systematically arranged in the Periodic Table. Further information on the...

Permanent moulds

A permanent mould is a mould used for casting that can be used repeatedly, unlike sand moulds, which are only used once. Permanent moulds are usually...

Permanent mould casting

In permanent mould casting, or ‘chill casting’ as it is also known, molten aluminium is gravity fed into so-called permanent moulds (or chill moulds...

Pickling

This surface treatment removes oxide films and impurities by use of alkaline chemicals, with the objective of producing a surface finish on a...

Pitting

Pitting is the most common form corrosion in aluminium and its alloys. It results from the metal coming into contact with an electrolyte (possibly...

Pitting corrosion

‘Pitting corrosion’ is the term used to describe localised, pinhole-like corrosive attack that leads to crater formation or hollowing out of the...

Plasma spraying

Plasma spraying is a method of thermal spraying. The powdered coating material is introduced into a plasma jet comprising ionised gases and melted...

Plastic deformation

Plastic deformation is the permanent deformation that remains even after the stress that caused the deformation in the first place has been removed....

Plate/Sheet

The terms ‘plate’ and ‘sheet’ are used to describe flat rolled products of rectangular shape with a thickness in excess of 0.20 mm. Apart from this...

Pliny the Elder

In his work Historica naturalis, Pliny the Elder, a Roman historian (23-79 A.D.), gave the name ‘alumen’ to natural alum, a mineral containing a...

Polishing

There are various methods available for polishing metal surfaces. The most common and best-known method uses a polishing wheel and polishing paste....

Pore-free process

The pore-free process is a special form of die-casting in which the air in the mould is forced out by introducing pure oxygen.

Powder coating

Powder coating is one of the most important enamelling processes. One differentiates between electrostatic and tribostatic powder coating.

Precipitation

This is one of the steps of the Bayer process. Caustic-soda liquor from the process is cooled to a temperature of 60-70 °C; at this temperature the...

Precision profiles

Precision profiles are profiles that have to satisfy special requirements with respect to shape and dimensional tolerances.

Pressure die-casting

With pressure die-casting, molten aluminium is injected under high pressure and at high velocity into a hollow mould. The moulds are made of hot-...

Primary aluminium

Primary aluminium is ‘new’ aluminium obtained from alumina, in contrast to aluminium obtained by recycling and remelting scrap (secondary aluminium...

Primary crystals

‘Primary crystals’ is the name given to those crystals that are the first to form when a molten alloy just starts to solidify.

Profiles

Profiles are long aluminium parts with cross-sections that are uniform over their whole length. An extremely wide range of cross-sections is possible...

Projection welding

Projection welding makes use of small projections on the parts to be welded to localise heat and pressure; it allows several projections to be welded...

Prototyping facility

A prototyping facility, also known as prototyper, is a manufacturing machine which records the calculated data of a virtual model. Based on that data...

Pulling

The strand exiting the die during extrusion is not only forced out by the extrusion stem but it is also drawn onto the run-out table by a so-called ‘...

Punch riveting

Punch riveting is a joining technique. Unlike conventional riveting, there is no need to pre-punch the parts to be joined because the rivet elements...