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Rust is an iron oxide, usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture.Several forms of rust are distinguishable both visually and by spectroscopy, and form under different circumstances.ther forms of rust exist, like the result of reactions between iron and chloride in an environment deprived of oxygen â rebar used in underwater concrete pillars is an example â which generates green rust.
Rust in your furnace is more common than you might think. Rust is the result of oxidation that occurs when metal, oxygen, and water mix. The great danger of rust to metal is that it eats away at the metal and eventually causes it to crumble and flake away.ou donât want this to occur to your furnace, especially along the heat exchangers: if cracks occur in a heat exchanger because of the weakening effect of rust, it can lead to dangerous carbon monoxide leaks.