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Surface Finishing Tutorial

#095 Magnetic Anodizing

Category : Anodic Oxidation Process
September16, 2011

Non-magnetic Aluminum products can be made magnetic by filling the pores of the anodizing layer created on the surfaces with magnetic materials such as iron, nickel, cobalt or their alloys.

For data storage media such as floppy disks, magnetic material coating application is generally used. However, the magnetic material embedding in surface pores has 2~3 times higher magnetic properties than the former. The [Fig.1] shows an example of a magnetic material with iron deposited by a secondary electrolysis where the surface coating layer dissolved away for the observation purpose.

[Fig.1] Precipitated iron on pores

As the magnetic retention power is influenced by the size of the magnetic material particles as clearly shown in [Fig.2], it is said that the data storage capacity can be increased by enlarging the surface pore diameter by an enlarging process.

[Fig.2] Magnetic retention power and Particle sizes

[Fig.3] shows the magnetic property of a coating with added magnetism by secondary electrolysis.

[Fig.3] Magnetic property of a coating with added magnetism by secondary electrolysis

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