![]() The zinc layer acts as a sacrificial metal for the steel. Galvanized steel is a carbon steel that would most likely rust if it did not have one or more layers of zinc applied to it. Galvanized steel is technically a coated material, but it is worth mentioning here. On the other hand, ferritic or martensitic stainless steels may be susceptible to rust because they contain less chromium. This layer is very corrosion resistant which prevents rust formation and protects the underlying metal. The chromium combines with the oxygen before the iron is able to which forms a chromium oxide layer. Austenitic stainless steels such as 304 or 316 have high amounts of nickel and chromium. Through it is important to note that some grades are more resistant to rust than others. Stainless steel is another example of a metal that does not rust. This is different than rust, because rust will flake away from an iron alloy thus allowing the rusting process to continue until material failure. This is because the aluminum oxide is more corrosion resistant than the aluminum alloy it rests on. However, aluminum does oxidize, but it actually protects the underlying unoxidized aluminum. This is because of the fact that rust is iron oxide, and most aluminum has virtually no iron in its composition. One way to eliminate the threat of rust is to use metals that don’t rust.Īluminum cannot rust. It is for these reasons that many people in charge of design and material selection try to avoid having to deal with rust and the negative effects that come with it. Rust compromises the mechanical characteristics of metal, alters the chemical properties, and is (usually) not considered aesthetically pleasing. ![]()
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