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SURFACE TECHNOLOGY FOR MAGNETS & SYSTEMS

The surface treatment of the rare earth permanent magnets is a key technology for the successful use of VACOMAX® and VACODYM®. Detailed knowledge of the corrosion mechanism, especially of the VACODYM alloys, in combination with the application conditions allows to close the optimum coating. As shown in the picture, the basis for outstanding corrosion protection is a homogeneous and reliable edge covering. Monitoring the corrosion resistance (diagram weight loss in dependance of exposure time in the HAST test) is important to ensuring a reproducible production quality. This is the basis for a continous improvement of the corrosion behavior of VACODYM alloys.

Weight loss in the climate test (HAST, 130°C, 2,7 bar, 95 % moisture) in dependance of the exposure time
Corrosion resistance after salt spray test
Homogeneous coated edge of a permanent magnet in cross section

Last update: 03.12.2012

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