C - Aluminium Articles

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Corrosion and corrosion behaviour of aluminium

What is corrosion? Base metals only occur in nature in combination with other elements and are extracted from these compounds by melting; they are chemically unstable and correspondingly readily reactive. This reactivity forms the basis of corrosion. It is a chemical reaction between base metals and their environment. In general, corrosion is the

Chemical behaviour of aluminium

Aluminium is a soft metal; it is a strong base and very reactive, with a very strong affinity for oxygen. That is why it always occurs in nature as a compound with oxygen, and never in the pure form. When aluminium comes into contact with air, a compact, protective oxide film rapidly forms on its surface. This protects the underlying metal from

Casting: Squeeze-Casting

In squeeze casting, an accurately dosed quantity of molten metal is cast into the lower half of a mould. By applying a large pressure, the upper half of the mould is then used to close the mould and the molten metal solidifies in the mould. The mould clamping force is maintained during the solidification phase. This prevents the formation of

Casting: Large-scale tooling made from cast aluminium

One should first point out that there is a strong tendency to manufacture ever-larger parts (especially car body parts) as single pieces. After all, the fewer components that have to be joined together, the easier and quicker – and more economical – the installation. This development is leading, however, to ever more complex component geometries.

Casting of stock

Aluminium alloys are increasingly being transported in the molten state, in special thermally insulated containers. However, for many applications alloys, which are obtained by smelting or remelting, have to be in a solid form before they can be processed, and casting processes are used for this purpose. Casting alloys are usually supplied in

Casting: Centrifugal casting

Centrifugal casting is mostly used by brass and bronze foundries. The process is of little significance for processing aluminium alloys. The molten aluminium is poured into a mould (permanent or sand) rotating at between 1500 and 5000 rpm. As a result of the centrifugal forces, the molten metal is pressed against the inside wall of the mould.

Corrosion behaviour with other metals

In the building and construction industry, aluminium is joined to various other metallic materials using welding, screws and other joining techniques. With such joints, corrosion behaviour is not determined by the specific properties of the materials used but is strongly dependent on the local conditions and media involved. Certain rules have to

Collection of formula

The collection of formulae included here presents the most important formulae in a concise, clear and well structured manner. The collection is divided as follows: Basic SI units Physical constants Symbols used Units Area Volume Arithmetic Trigonometric functions Analytical geometry Differential calculus Statics Kinematics Dynamics Heat Strength