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I have some pieces of rusted mild steel pipes that i intend to remove rust from.I inserted a test sample in 15% Hydrochloric acid for 4 hours after which all the rust was removed from the surface and corrosion has slowed dramatically after washing off the acid.The subsequent pieces of steel pipe I tried on a large scale showed rapid corrosion soon after the pipes have been removed from the acid .What could be the cause of this