Some chemistry :


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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) &#8594; 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 &#8594; 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?



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