Protocol for corrosion testing and for mechanical testing
Protocol for corrosion testing
A study has been carried out to map the relevant testing methods
for corrosion resistance of magnetic material/components. The
neutral salt fog test (NSS) (DS/EN ISO 9227:2006), the water vapour
test (DS/EN ISO 6270-2:2005) and the electrochemical test (ASTM G59
- 97(2009)) are the most simple and effective ways of testing the
corrosion resistance of uncoated and coated permanent magnets. The
Figure shows three stages of corrosion of a coating ring Nd-magnet
from salt spray testing (0 h, 240 h and 500 h).
Protocol for mechanical testing
Magnetic materials, such as e.g. NdFeB, are currently not
considered a structural material and no dedicated mechanical
testing standards apply. Relevant testing can be performed in a
tensile testing machine according to ASTM D638 (plastic) or DS/EN
ISO 6892-1 (metals).
An often used mechanical characterization method is the
"pull-off test", which may be carried out according to the "Magnet
Distribution and Fabrication Association" procedure description
Based on the observed increased industrial use and potential use
of magnetic materials, we expect within 2-5 years to see new
procedures reg. standardized testing to evolve owing to the
increased focus on the lifetime of magnetic components/systems.
Contact: Nikolaj Zangenberg, firstname.lastname@example.org, +45 7220