 Part stacking
Many parts are subject to what we call “contact corrosion”. This can be due to small amounts of water or other contaminants getting trapped between parts along a line of contact, or it can come from “galvanic” action between two parts. Corrective measures include using non-conductive parts separators and careful drying of RP protected parts before stacking. |
Proper drying
Both solvent and water-based RP’s must be dried properly before packaging or storage, though this is much more important, and takes longer, with water based products. Often, water based products are force dried using heated air. |
Part separators
Be sure that part separators are completely dry and non-corrosive before using them. Plastic mesh is particularly good in many cases.
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Dip tank design
Solvent based, water displacing RP’s are lighter than water, so any water they lift from parts will sink to the bottom of a dip or holding tank. Many users design dip tanks with a sloped bottom and a drain-cock to remove the water. |
Spraying and flow of the RP
If you spray or wipe a RP onto your parts, be sure that all surfaces are properly coated. When dipping parts in a corrosion inhibitor make sure that there are no inverted blind holes, cavities, or pockets that don’t get coated. |
Part storage
The most important element in storing parts is to pick a location where parts will not be exposed to high humidity and quick changes in temperatures. Avoid locations near exterior overhead doors or in damp areas where moisture can condense on the parts. |
Self healing
If your RP dries to a hard, dry film be careful not to nick or scratch it by moving parts around. |
Cardboard contact
Most cardboard (unless it is specially treated) is naturally acidic, and will cause corrosion on steel and iron parts if left in direct contact. Avoid this condition by adding plastic film or purchasing treated cardboard products.
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 Bacteria
Is usually not a problem in oil/solvent based products, but it can cause problems and loss of protection in water based fluids. Be sure to maintain proper concentrations and observe temperature limits. |
How RP’s work:
Water and air in direct contact with ferrous metal sets up a small “cell”. These cells can be extremely small to start with. RP’s work by establishing a barrier of molecules which reject moisture. Remember that unlike paint, RP’s are designed to be easily removed, so they have limitations to exposure and abrasion from wind and rain.
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