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Significance and Use
This test method provides a controlled corrosive environment which can be utilized to produce relative corrosion resistance information for sintered permanent magnets.
Although prediction of performance in natural environments has seldom been statistically correlated with corrosion test results, sufficient empirical results are available to support the usefulness of this test in quantifying relative resistance to corrosion from moisture and heat.
The reproducibility of results in this test method is dependent on the type, size, and shape of specimens tested, and the control of the operating variables. In any testing program, sufficient replicates should be included to establish confidence limits. Replicates may be run simultaneously, in subsequent test runs, or in duplicate test chambers.
When multiple test chambers and operators are utilized, efforts shall be made to perform a suitable repeatability and reproducibility study for the equipment, operators, and test method.
1.1 This test method covers the equipment, procedures, and measurement of the resistance of permanent magnet alloys against corrosion in high temperature, high pressure water vapor environments. This test is also known as the Bulk Corrosion Test (BCT).
1.2 The values and equations stated in customary (cgs-emu and inch-pound) units or SI units are to be regarded separately as standard. Within this standard the SI units, when different from customary units, are shown in brackets, the values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D3330/D3330M Test Method for Peel Adhesion of Pressure-Sensitive Tape
JEDEC StandardsJESD22-A102-C Accelerated Moisture Resistance - Unbiased Autoclave
ICS Number Code 29.030 (Magnetic materials)
UNSPSC Code 31381200(Sintered magnets and magnet assemblies)
ASTM A1071 / A1071M-11, Standard Test Method for Evaluating Hygrothermal Corrosion Resistance of Permanent Magnet Alloys, ASTM International, West Conshohocken, PA, 2011, www.astm.orgBack to Top