{"id":9012,"date":"2016-12-01T18:24:06","date_gmt":"2016-12-01T18:24:06","guid":{"rendered":"https:\/\/staging.asminternational.org\/ims\/one-minute-mentor-the-passive-layer-in-stainless-steels\/"},"modified":"2023-02-23T20:59:43","modified_gmt":"2023-02-23T20:59:43","slug":"one-minute-mentor-the-passive-layer-in-stainless-steels","status":"publish","type":"post","link":"https:\/\/www.asminternational.org\/ims\/results\/-\/journal_content\/56\/10192\/26993681\/NEWS\/","title":{"rendered":"One Minute Mentor: The Passive Layer in Stainless Steels"},"content":{"rendered":"<p>\n\tThe presence of chromium causes the buildup of a chromium oxide layer that is impermeable and adherent to the alloy substrate, protecting it from any further oxidation or corrosion. Any scratch on this protective layer exposes the substrate to oxygen, and a new protective oxide layer is produced.<\/p>\n<p>\n\tOne important aspect of this layer is that it must be homogeneous throughout the surface of the alloy. Any differences from place to place could generate a difference of electrochemical potential, which could trigger a corrosion process.<\/p>\n<p>\n\tUnder normal conditions, the thickness of the protective passive layer is in the range of 1.5 to 2.5 nm, composed mostly of chromium oxide\/hydroxide and iron\/iron oxide. The strong affinity of chromium for oxygen promotes a very stable compound (Cr<sub>2<\/sub>O<sub>3<\/sub>) that suppresses any other reactions and thus stops corrosion.<\/p>\n<p>\n\tThe chemical stability of the passive layer depends on the type of surface-finishing treatment. Processes such as electrochemical polishing increase the surface concentration of chromium, promoting a thicker and more stable passive layer when compared to mechanically processed surfaces<\/p>\n<p>\n\tVolume 4D, <em>Heat Treating of Irons and Steels<\/em>&nbsp;\u21d2 Heat Treated High-Alloy Steels \u21d2&nbsp;Nitriding of Stainless Steels \u21d2&nbsp;Stainless Steels&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The presence of chromium causes the buildup of a chromium oxide layer that is impermeable and adherent to the alloy substrate, protecting it from any further oxidation or corrosion.<\/p>\n","protected":false},"author":63103,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[461,447,448,520,1],"tags":[],"class_list":["post-9012","post","type-post","status-publish","format-standard","hentry","category-general","category-news","category-news-articles","category-steels","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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