Rust Reduction via Electrolysis By Mark Van Ditta,
Cleaning badly rusted metal does not have to be hard work. Since red rust (ferrous oxide) formation is an electrochemical process (oxidation), all we need to do is reverse this process. During oxidation, electrons are given up by iron and combine with oxygen. The result is ferric oxide (black rust). When ferric oxide oxidizes, ferrous oxide is formed (red rust). What we need to do "reverse oxidize" the red rust (reduction); hence, donate electrons to the ferrous oxide.
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Black Rust - [sorry link died]
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How To Achieve Forge Black Iron Rustproofing and Metal Finish
This metal finish is known among afficianadoes of forged iron metal work as FORGE BLACK, and it derives from a technique dating back over a thousand years. This method is an attractive finish and a very early method for the rust proofing of iron.
The metal is first meticulously cleaned with 00 emery cloth or steel wool, then washed with denatured alcohol, shellac grade. This is to remove all grease and dirt. Do this with clean cloth or paper gloves on so that further grease from handling is not deposited.
As soon as this is dry, coat with linseed oil by wiping, brushing or spraying. Immediately heat over the forge with air flow applied. This adds free carbon to the burning oil, and an enamel like finish will eventually result, once the oil is all burned off. Do not heat above black. When the piece stops smoking, remove, cool, and wipe with a cloth to remove free soot. This leaves a good black finish and has been used for ages as an initial treatment for iron, with defeat of rust as its main ideal.
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« Last Edit: January 22, 2009, 10:59:20 pm by oRo »
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