What Does Magnetization Mean?
Magnetization is the density of magnetic dipole moments that are induced in a magnetic material when it is placed near a magnet. The magnetic effects of a material can also be induced by passing an electrical current through the material; the magnetic effect is caused by the motion of electrons in atoms, or the spin of the electrons or the nuclei.
Magnetization is also known as magnet polarization.
Corrosionpedia Explains Magnetization
When a magnetized material or any magnetic field generating materials are brought into contact with an electrochemical reaction process, it affects the reaction by changing the mass transport of ions in the solution.
Corroded materials generally tend to have a higher magnetic field generation, which results in further decomposition or an accelerated corrosion rate. However, this is not always true. Sometimes the magnetic field may slow the corrosion process, depending on the geometry of the material experiencing the corrosion.
Neodymium magnets (NdFeB) are permanent magnets that highly favor corrosion due to the presence of a reactive Nd-rich phase. If a droplet of dilute hydrochloric acid is placed on the surface of a piece of NdFeB, then vigorous corrosion will take place along with the release of hydrogen. If the sample is in its magnetized state, the droplet will rotate. The direction of rotation is reversed if a droplet is placed on the opposite pole of the magnet. No rotation is observed for demagnetized samples.