You saw visible etching, or you just stopped using it on principle? It is acidic, but only pH 4, and is supposed to not do anything to the metal (just the rust) even if using long soaks.
Evapo-Rust™ is extremely safe on skin and all materials except RUST. It is also bio-degradable and earth friendly. Evapo-Rust™ is water soluble and pH neutral, non-toxic, non-corrosive, non-flamable and contains no acids, bases, or solvents. The only material found to be effected by Evapo-Rust™ long term is magnesium.
Ie a Ph of 7
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Post by Timo Nieminen on May 23, 2015 10:32:43 GMT
pH of 4 is near the borderline between removing metal and not removing metal. Also a pH at which rust removal is very effective. So seems a sensible choice. Fruit juices with pH of about 3.5 to 4 work quite well for rust removal, presumably for the same reasons. When you get to pH of 3 (e.g., vinegar, as above), you can etch steel usefully quickly; how quickly depends on pH and temperature. Was just wondering what William had seen with Renaissance Metal De-corroder. One way, it's good for rust removal, and the other way, it's good for rust removal and light etching (e.g., to bring out pattern-welding patterns). [And from William's reply immediately above, it might be a good safe light etchant.]
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