Standardization News

A new ASTM International test method will provide an effective screening method to identify magnets that are subject to excessive corrosion in high humidity environments. A1071/A1071M, Test Method for Evaluating Hygrothermal Corrosion Resistance of Permanent Magnet Alloys, was developed by Subcommittee A06.01 on Test Methods, part of ASTM International Committee A06 on Magnetic Properties.

According to Glenn Lawson, A1071/A1071M will allow magnet producers and users to screen products for latent corrosion issues. The test will be particularly useful for applications requiring high performance where clearances are tight and in aggressive environments in which high humidity and temperature cycling are common.

Lawson notes that sintered magnets can be prone to corrosion in high humidity environments.

"In some applications, particularly high performance direct current motors where clearances are very tight, corrosion debris can cause loss of system performance or failure," says Lawson. Corrosion tests have varied, from high temperature, high humidity tests to autoclave (high pressure steam) testing. A1071/A1071M answers the great need in the industry to standardize the test conditions so that comparisons between magnets can be facilitated.

Interested parties are welcome to join in the standards developing activities of A06.

To purchase ASTM standards, visit www.astm.org and search by the standard designation number, or contact ASTM Customer Relations (phone: 610-832-9585).

CONTACT Technical Information: Glenn Lawson, Moog Components Group • Blacksburg, Va. • Phone: 540-443-4369 O ASTM Staff: Kelly Paul • Phone: 610-832-9745 O Upcoming Meeting: Nov. 14-15 • November Committee Week • Tampa, Fla.