Cleaning a metal object, especially a neodymium-iron-boron alloy magnet, in an acid bath comprises adding to the bath a substance that reacts with another substance in the bath to generate a gas

摘要

Cleaning a metal object in an acid bath comprises adding to the bath a substance (I) that reacts with another substance in the bath to generate a gas. An independent claim is also included for working on a metal object by machining the object, cleaning it as above and then passivating it with a coating.