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The Effects of Magnetic Particles on Alloy Steel Fatigue Test Pieces

Can Magnetic Particles have an effect on the fatigue properties of alloy steel? Our fatigue tests prior to Magnetic Particle are 200,000 cycles. After Magnetic Particle and alkaline clean/degrease the fatigue drops to about 80,000 cycles. We looked under a black light and there are still some residual mag particles on the surface of the test pieces. I guess the obvious question is to clean it completely and then re-test. acetone [linked by editor to product info at Rockler] seems to remove all of the particles but we have not tested samples after such cleaning. What is a good cleaning method for removing mag oil and particles prior to plating?

Don Huffman
- Torrance, California, USA

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