Magnetize aluminum

Again and again, the question arises of the magnetization of aluminum. After all, aluminum is a metal. On the one hand, aluminum can not be permanently magnetized because it is paramagnetic. On the other hand, it may have magnetizing properties due to eddy current for the duration of the current flow. Below we have provided you with all the important information for magnetizing aluminum.

The magnetic conductivity is crucial in magnetizing

Whether substances can be magnetized depends above all on the magnetic flow density, the magnetic conductivity. This is also called permeability. Thereafter, the permeability number indicates whether a substance is magnetizable:

  • Permeability 1: paramagnetic
  • (Air, aluminum)

  • Permeability > 1: ferromagnetic (iron)

There are exceptions when magnetizing stainless steel. This is mainly dependent on the respective alloy.

Aluminum magnetize using a generated eddy current field

Aluminum itself can not be magnetized independently due to its permeability. For this purpose, a corresponding magnetic field must be constantly generated or present. Eddy current, for example, can magnetize aluminum. However, if the power source is turned off, the magnetization of the aluminum is completed. This method is used in waste separation.

Alu is primarily used where magnetism is undesirable

However, aluminum may be part of a particular alloy used for permanent magnets. These are Alnioco alloys. These consist of aluminum, nickel, copper, cobalt and iron. These alloys are produced by sintering and special casting techniques.

The magnetization of aluminum is complex and correspondingly rare

Rather, aluminum is used wherever magnetism must not occur. For example in vehicle construction. The magnetization of aluminum, such as eddy current, is also a relatively unique and rare form of magnetizing metal.

Tips & Tricks

Aluminum offers numerous other properties that make it versatile. Thus, the light metal has a considerably higher electrical conductivity. The thermal conductivity is also significantly higher than that of other metals. Since aluminum forms an oxide layer, aluminum can be controlled by oxidation.

In contrast to other metals, the blacking of aluminum poses great difficulties. The oxide layer also prepares a considerably greater effort when it comes to painting aluminum sheet and aluminum. This makes the machining of aluminum demanding.

Video Board: Can you magnetize aluminum