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What is the best way to clean metal parts for a lab test or field test?

The ARMOR lab often has to clean metal parts prior to testing in our humidity chambers. ARMOR performs accelerated humidity tests both for internal use (benchmarking tests and R&D) and for customers. In order to accurately assess the performance of the vapor corrosion inhibitors, it is important to properly clean the metal surface of any other RP liquids, oils, contaminants or process liquids; this ensures that the product being tested for corrosion inhibition is the only material on the surface of the part during the test.

ARMOR recommends using a solvent with a high alcohol content such as denatured alcohol, which is a blend of ethyl alcohol and methyl alcohol, commonly known as alcohol appliance fuel. The parts are submersed if possible and brushed with a soft bristle brush. If the parts are large they can be wiped from top to bottom with a solvent-soaked, lint-free cloth. The alcohols will evaporate leaving the part clean and free of moisture. The cleaned surfaces will be highly reactive and susceptible to corrosion so after the parts are cleaned they should be inspected for corrosion and immediately put into testing. Isopropyl alcohol is not recommended as it can contain a high percentage of water, potentially causing flash rust.

Also, it is important to remember to wear gloves when cleaning the metal surfaces to prevent recontamination due to the acidity and moisture that can be transferred from skin to the metal part.

For more information on Armor Protective Packaging®’s full line of corrosion management products, visit the ARMOR website or contact your ARMOR sales representative.