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Corrosion, rust, build up, nasty mess, but he most common is "corrosion", then "rust".
Corrosion iron oxide
Yes. Rust is oxidation of the metal, a form of corrosion (chemical destruction) that weakens metal.
Rust & corrosion can seriously reduce the strenghth of metal if left untreated. The best protection for metal is to maintain the bare metal with a primer and topcoat, thus avoiding or at the least, slowing down any corrosion. If the rust had started to form already, due to lack of maintenance, the rust would need to be treated with a rust treatment. Then a primer could be applied to protect. There is a few extremes depending how you look at it - A car rusting will fail a road safety examination (MOT Test in the UK), but a bridge failing due to rust would be a disaster. There is some examples of bridge failures on wiki. Hope this helps.
Steel does not rust by normal corrosion agents.
Corrosion is the slow chemical change a metal undergoes when exposed to oxygen. The chemical change is the rust that forms on the metal. Iron is extremely susceptible to corrosion (rust). Corrosion can begin to form rust on iron right after the Ingots have cooled at the Foundry.
Rust is one example.
yes
"Rust" or "corrosion."
Iron is the only metal that can rust. The usual term for the destruction of a metal by oxidation is corrosion, and 'rust' or 'rusting' is the term for corrosion specific to iron and its compounds.
Metals need to be protected against rust and tarnish because rust and tarnish eat metals.
The metal can be painted with a protective layer or electroplated. Galvanization involving the use of a sacrificial and more reactive metal can also be applied, e.g. coating iron with zinc. Zinc by itself does not rust, and even if the zinc layer is scratched such that iron is exposed, iron will not rust as it is sacrificially protected by the zinc against corrosion.