Who needs digital

woodchucker said:
BTW, here are my results...
Click to expand...
That rust looks pretty much removed. Nice result :)

The thing is, as with most rust removal by chemicals, as soon as the new clean surface is exposed, it is vulnerable. The etched micro-surface presents a huge area to air oxygen, and it starts a new, fairly aggressive, rusting. This is why highly polished surfaces resist rusting getting started. Possibly brand-name de-rusters like Evapo-rust may have an additive to passivate the surface, I don't know.

If the de-rust is precursor to a plating operation, then leave the part in the wash water, and transfer into the plating solution while still wet, and try and do it within an hour. If you want them dry, then first put into something alkaline, like hot washing soda, or seal up with way oil or something, to protect it. Every time I de-rust anything, I am always startled by how fast it starts to rust again.
 
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