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Menno: After electrolysis, you have removed any oil from the steel or cast iron pores, as well as any paint, phosphating, galvanizing, that could have shielded the iron from the oxygen in the atmosphere. The rust is recurring because you have cleaned it so well and provided Oxygen and exposed Iron. Not much you can do about that. If you let the black oxide on the part, that will not re-rust because it is chemically inert, and will not combine further with oxygen. But since there's likely some fresh iron with no black oxide coating, these areas will red rust quickly. Now if it's a part that you do not wish to paint (like an engine internal part), give it a light coating of oil. You can also spray some light oil on those parts that you will eventually paint, but the part will need to be solvent and hot water washed before painting. If you will be painting it, I suggest priming it right away for protection. Additionally, you can hand spray or brush a little Phosphoric Acid on it and let that dry. This will give a thin phosphate coating to the part and help to deter further red rust. You can later lightly sand or Scotchbrite it off and it will prime just fine. You should store the cleaned parts in a dry location, and re-coating is the best preventative. Hope this is helpful ! Frank-in-Tallahassee
70D // 855
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