{"id":6493,"date":"2020-11-16T02:31:45","date_gmt":"2020-11-16T02:31:45","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=6493"},"modified":"2025-12-15T07:07:55","modified_gmt":"2025-12-15T07:07:55","slug":"como-o-cromo-atua-na-resistencia-a-corrosao-do-aco-inoxidavel","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/pt\/blog\/como-o-cromo-atua-na-resistencia-a-corrosao-do-aco-inoxidavel\/","title":{"rendered":"Como o cromo funciona na resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel"},"content":{"rendered":"<p><strong>O cromo no a\u00e7o inoxid\u00e1vel pode proporcionar <a href=\"https:\/\/www.kaysuns.com\/pt\/resistencia-a-corrosao-do-aco-inoxidavel\/\" target=\"_blank\">resist\u00eancia \u00e0 corros\u00e3o<\/a><\/strong><\/p>\n\n\n\n<p>O cromo (Cr) \u00e9 particularmente eficaz em ambientes oxidantes, como aqueles que cont\u00eam \u00e1cido n\u00edtrico. Depois de adicionado o cromo ao a\u00e7o inoxid\u00e1vel, um \u00f3xido com uma propor\u00e7\u00e3o qu\u00edmica de di\u00f3xido de ferro ser\u00e1 formado em sua superf\u00edcie. Como a afinidade do cromo e do oxig\u00eanio \u00e9 muito maior do que a do ferro, a presen\u00e7a do cromo aumenta a estabilidade desse \u00f3xido. O a\u00e7o com um teor de cromo de mais de 10,5% \u00e9 considerado inoxid\u00e1vel na atmosfera. Em ambientes mais agressivos, uma propor\u00e7\u00e3o maior \u00e9 necess\u00e1ria.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"643\" height=\"472\" src=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/11\/chromite.jpg\" alt=\"cromita\" class=\"wp-image-6494\" srcset=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/11\/chromite.jpg 643w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/11\/chromite-300x220.jpg 300w\" sizes=\"(max-width: 643px) 100vw, 643px\" \/><\/figure>\n<\/div>\n\n\n<p><strong>O cromo tamb\u00e9m \u00e9 um elemento formador de ferrita.<\/strong><\/p>\n\n\n\n<p>As ligas de Fe-Cr contendo mais de 12% Cr s\u00e3o todas ligas de ferrite. No entanto, o aumento do teor de cromo em ligas de Fe-Cr-C ou Fe-Cr-Ni-C promover\u00e1 a forma\u00e7\u00e3o e o res\u00edduo de ferrita em a\u00e7o inoxid\u00e1vel martens\u00edtico, a\u00e7o inoxid\u00e1vel austen\u00edtico e a\u00e7o inoxid\u00e1vel duplex. No a\u00e7o-liga ferr\u00edtico, o cromo \u00e9 o principal elemento de liga que estabiliza a estrutura da ferrita.<\/p>\n\n\n\n<p>A resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel depende do Cr, mas como o Cr \u00e9 um dos componentes do a\u00e7o, os m\u00e9todos de prote\u00e7\u00e3o s\u00e3o diferentes.<\/p>\n\n\n\n<p>Quando a quantidade adicional de cromo atinge 10,5%, a resist\u00eancia \u00e0 corros\u00e3o atmosf\u00e9rica do a\u00e7o \u00e9 significativamente aumentada, mas quando o teor de cromo \u00e9 maior, embora a resist\u00eancia \u00e0 corros\u00e3o ainda possa ser melhorada, isso n\u00e3o \u00e9 \u00f3bvio. A raz\u00e3o \u00e9 que quando o cromo \u00e9 usado para ligas de a\u00e7o, o tipo de \u00f3xido de superf\u00edcie \u00e9 alterado para um \u00f3xido de superf\u00edcie semelhante ao formado em metal cromo puro. Este \u00f3xido de cromo firmemente aderido protege a superf\u00edcie e impede uma maior oxida\u00e7\u00e3o. Esta camada de \u00f3xido \u00e9 extremamente fina, e o brilho natural da superf\u00edcie do a\u00e7o pode ser visto atrav\u00e9s dela, dando ao a\u00e7o inoxid\u00e1vel uma superf\u00edcie \u00fanica. Al\u00e9m disso, se a camada superficial for danificada, a superf\u00edcie de a\u00e7o exposta reagir\u00e1 com a atmosfera para se reparar e re-formar esta \"pel\u00edcula de passiva\u00e7\u00e3o\" de \u00f3xido para continuar a desempenhar um papel protetor.<\/p>\n\n\n\n<p>Portanto, todos os a\u00e7os inoxid\u00e1veis possuem uma caracter\u00edstica comum, ou seja, o teor de cromo est\u00e1 acima de 10,5%.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>Postado por <a href=\"https:\/\/www.kaysuns.com\/pt\/\" target=\"_blank\">tubos e acess\u00f3rios de a\u00e7o inoxid\u00e1vel<\/a> fornecedor, KAYSUNS.<\/p>","protected":false},"featured_media":6494,"template":"","categories":[186],"tags":[],"class_list":["post-6493","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-stainless-steel-knowledge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How Chromium Works In Stainless Steel Corrosion Resistance - KAYSUNS<\/title>\n<meta name=\"description\" content=\"After chromium is added to stainless steel, an oxide with a chemical ratio of iron dioxide will be formed on its surface.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.kaysuns.com\/pt\/blog\/como-o-cromo-atua-na-resistencia-a-corrosao-do-aco-inoxidavel\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How Chromium Works In Stainless Steel Corrosion Resistance - KAYSUNS\" \/>\n<meta property=\"og:description\" content=\"After chromium is added to stainless steel, an oxide with a chemical ratio of iron dioxide will be formed on its surface.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.kaysuns.com\/pt\/blog\/como-o-cromo-atua-na-resistencia-a-corrosao-do-aco-inoxidavel\/\" \/>\n<meta property=\"og:site_name\" content=\"Stainless Steel Pipe and Fittings | KAYSUNS\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-15T07:07:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/11\/chromite.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"643\" \/>\n\t<meta property=\"og:image:height\" content=\"472\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.kaysuns.com\/blog\/how-chromium-works-in-stainless-steel-corrosion-resistance\/\",\"url\":\"https:\/\/www.kaysuns.com\/blog\/how-chromium-works-in-stainless-steel-corrosion-resistance\/\",\"name\":\"How Chromium Works In Stainless Steel Corrosion Resistance - 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