Editing Rust (section)

=== Rust-resistant alloys ===
{{See also|Stainless steel|Weathering steel}}

[[File:Rust-AH-2022.jpg|thumb|left|Cor-Ten sheet with rust coating]]
Stainless steel forms a [[Passivation (chemistry)|passivation]] layer of [[chromium(III) oxide]].<ref>{{Cite book|url=https://books.google.com/books?id=h4zLBQAAQBAJ&q=Stainless+steel+forms+a+passivation+layer+of+chromium%28III%29+oxide&pg=PA142|title=Ohmic Heating in Food Processing|last1=Ramaswamy|first1=Hosahalli S.|last2=Marcotte|first2=Michele|last3=Sastry|first3=Sudhir|last4=Abdelrahim|first4=Khalid|date=2014-02-14|publisher=CRC Press|isbn=9781420071092|language=en|url-status=live|archive-url=https://web.archive.org/web/20180502013026/https://books.google.com/books?id=h4zLBQAAQBAJ&pg=PA142&dq=Stainless+steel+forms+a+passivation+layer+of+chromium(III)+oxide&hl=en&sa=X&ved=0ahUKEwinp83KkefXAhXD5lQKHYSACKAQ6AEIJjAA#v=onepage&q=Stainless%20steel%20forms%20a%20passivation%20layer%20of%20chromium(III)%20oxide&f=false|archive-date=2018-05-02}}</ref><ref>{{Cite web|url=http://www.homofaciens.de/technics-electrochemistry-corrosion-prevention_en.htm|title=Corrosion prevention - HomoFaciens|last=Heinz|first=Norbert|website=www.homofaciens.de|access-date=2017-11-30|url-status=live|archive-url=https://web.archive.org/web/20171201030421/http://www.homofaciens.de/technics-electrochemistry-corrosion-prevention_en.htm|archive-date=2017-12-01}}</ref> Similar passivation behavior occurs with [[magnesium]], [[titanium]], [[zinc]], [[zinc oxide]]s, [[aluminium]], [[polyaniline]], and other electroactive conductive polymers.<ref>{{Cite journal |title=Formation of stable passive film on stainless steel by electrochemical deposition of polypyrrole |url=https://www.researchgate.net/publication/244152652 |journal=Electrochimica Acta}}</ref>

Special "[[weathering steel]]" alloys such as Cor-Ten rust at a much slower rate than normal, because the rust adheres to the surface of the metal in a protective layer. Designs using this material must include measures that avoid worst-case exposures since the material still continues to rust slowly even under near-ideal conditions.<ref>{{cite web |url= https://www.azom.com/article.aspx?ArticleID=12974|title= Weathering Steel|author=<!--Not stated--> |date= 28 June 2016|website= azom.com|publisher= AZoM|access-date= 2022-09-13|quote=The steel is allowed to rust and because of its alloy composition rusts more slowly than conventional steel and the rust forms a protective coating slowing the rate of future corrosion}}</ref>
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