Polishing of a rusted Bugei tachi

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aussie-rabbit
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Posts: 4,610

Polishing of a rusted Bugei tachi May 23, 2015 3:09:52 GMT

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Post by aussie-rabbit on May 23, 2015 3:09:52 GMT

May 23, 2015 0:00:44 GMT Timo Nieminen said:

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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Timo Nieminen Member Posts: 3,706	Polishing of a rusted Bugei tachi May 23, 2015 3:21:33 GMT Quote Select Post Deselect Post Link to Post Back to Top Post by Timo Nieminen on May 23, 2015 3:21:33 GMT Renaissance Metal De-corroder is pH 4.
	"In addition to being efficient, all pole arms were quite nice to look at." - Cherney Berg, A hideous history of weapons, Collier 1963.

aussie-rabbit Member Posts: 4,610	Polishing of a rusted Bugei tachi May 23, 2015 8:52:44 GMT Quote Select Post Deselect Post Link to Post Back to Top Post by aussie-rabbit on May 23, 2015 8:52:44 GMT May 23, 2015 3:21:33 GMT Timo Nieminen said: Renaissance Metal De-corroder is pH 4. This is somewhat useful -
	"Do not meddle in the affairs of wizards, for poof RIBBIT!" "The children of tomorrow must live in what we do today."

william m
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Polishing of a rusted Bugei tachi May 23, 2015 10:20:13 GMT

Quote

Post by william m on May 23, 2015 10:20:13 GMT

May 23, 2015 0:00:44 GMT Timo Nieminen said:

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.

I used it on blades with hamon, which definitely "popped" out after using it.

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viewtopic.php?f=18&t=23818

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Timo Nieminen
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Polishing of a rusted Bugei tachi May 23, 2015 10:32:43 GMT

Quote

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.]

See www.corrosionist.com/what_is_effect_pH_Corrosion_rate.htm for some info and graphs (especially fig 1).

Last Edit: May 23, 2015 10:34:03 GMT by Timo Nieminen

"In addition to being efficient, all pole arms were quite nice to look at." - Cherney Berg, A hideous history of weapons, Collier 1963.

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Polishing of a rusted Bugei tachi

Post by aussie-rabbit on May 23, 2015 3:09:52 GMT

Post by Timo Nieminen on May 23, 2015 3:21:33 GMT

Post by aussie-rabbit on May 23, 2015 8:52:44 GMT

Post by william m on May 23, 2015 10:20:13 GMT

Post by Timo Nieminen on May 23, 2015 10:32:43 GMT

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