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Old 05-19-20, 06:26 AM
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Acid dipping is a good way to remove rust. I do a fair bit of motorcycle related restoration work, replating hardware myself using a zinc plating setup, and derusting and stripping the old plating is step one in that process. You can dip an old rusted fastener in diluted acid solution and it will remove all the red rust down to base metal pretty quickly. It's important to not leave the part in the sauce too long though or it will remove metal and cause the metal surface to develop a blackish coating. Soaking that stay in the sauce, minimum time needed to remove the rust, followed by dunking in some baking soda solution to neutralize, will work fine.
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