The reason I boil parts going into tank id to degrease them, bonus of heating them up.
If you saw bare metal after bath that generally means contamination of some kinf that is preventing acid from touching the metal and causing reaction. If you cannot eliminate this entirely, take parts out after 5 minutes and wipe/scrub them down with lint-free cloth to get whatever it is off the surface and then put back in bath. I use thick rbber gloves to prevent burns on hot metal parts.
If you saw bare metal after bath that generally means contamination of some kinf that is preventing acid from touching the metal and causing reaction. If you cannot eliminate this entirely, take parts out after 5 minutes and wipe/scrub them down with lint-free cloth to get whatever it is off the surface and then put back in bath. I use thick rbber gloves to prevent burns on hot metal parts.



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