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Posted by Chriscase [76.224.243.231] on Tuesday, June 08, 2010 at 00:14:37 :
In Reply to: Rust theory thread link. posted by Chriscase [76.224.243.231] on Monday, June 07, 2010 at 19:02:37 :
From Wiki: <http://en.wikipedia.org/wiki/Iron%28III%29_oxide>
2 FeO(OH) → Fe2O3 + H2O
At about 200 °C, the iron(III) hydroxide converts into Fe2O3.[4]
And also: FeO is thermodynamically unstable below 575 °C, disproportionating to metal and Fe3O4:[2]
4FeO → Fe + Fe3O4
SOoo, heating Fe3O4 to above 575c makes it into FeO, which is 10% denser than plain old rust, so 10% smaller, in addition to the reaction breaking the rust into powder. ?
SOooo, maximum help in loosening rusted bolts happens at about red hot, umm 1100 degrees?