Q. We are looking to clean epoxy coated Neodymium donut magnets. Any oils or contaminants need to be removed prior to epoxy coating. What recommendations can Alconox Inc. provide?
A. The key to the cleaning is going to be very specific to which stage of the process we are concerned with. Typically the first cleaning step should be done after forming and machining.
Generally speaking, you want 2% Citranox® Liquid Acid Cleaner and Detergent in a short cleaning cycle at room temperature or only slightly elevated temperature. This will help prevent oxidation. Follow this with an immediate rinse in RO water, as it is less acidic than DI water (due to carbon dioxide absorption from the air).
Then clean again with Citranox taking note of the orientation of parts; cleaning fixture traits like material, construction and drainage; and type of cleaning cycle such as manual wash, ultrasonic, conveyor wash, agitation wash, etc. This will all affect the cleaning times and temperatures.
After coating and magnetization, do a final cleaning with Citranox and a final rinse, which should be quite simple as compared to the previous clean.
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