{"id":17330,"date":"2021-12-11T08:01:58","date_gmt":"2021-12-11T08:01:58","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=17330"},"modified":"2026-03-25T03:43:46","modified_gmt":"2026-03-25T03:43:46","slug":"o-que-e-decapagem-e-passivacao-para-aco-inoxidavel","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/pt\/blog\/o-que-e-decapagem-e-passivacao-para-aco-inoxidavel\/","title":{"rendered":"O que \u00e9 Pickling and Passivation for Stainless Steel"},"content":{"rendered":"<h2 class=\"wp-block-heading\">O que \u00e9 Pickling and Passivation for Stainless Steel<\/h2>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">a) Aplica\u00e7\u00e3o: <\/h3>\n\n\n\n<p>Ap\u00f3s um amplo decapagem e passiva\u00e7\u00e3o para <a href=\"https:\/\/www.kaysuns.com\/pt\/\" target=\"_blank\" rel=\"noreferrer noopener\">tubos e acess\u00f3rios de a\u00e7o inoxid\u00e1vel<\/a>Todos os tipos de \u00f3leo, ferrugem, pele de \u00f3xido, manchas de solda e outros tipos de sujeira podem ser removidos. E a superf\u00edcie de a\u00e7o inoxid\u00e1vel se tornar\u00e1 uniforme e branca prateada. Al\u00e9m disso, a resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel tamb\u00e9m ser\u00e1 muito melhorada, o que \u00e9 adequado para v\u00e1rios tipos de pe\u00e7as, chapas e equipamentos em a\u00e7o inoxid\u00e1vel.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">b) Caracter\u00edsticas: <\/h3>\n\n\n\n<p><a href=\"https:\/\/www.kaysuns.com\/pt\/blog\/decapagem-e-passivacao-de-tubos-de-aco-inoxidavel-2\/\" target=\"_blank\">Decapagem e passiva\u00e7\u00e3o<\/a> s\u00e3o f\u00e1ceis de operar e convenientes de usar. Para decapagem e passiva\u00e7\u00e3o, eles s\u00e3o muito econ\u00f4micos e pr\u00e1ticos. Enquanto isso, podem ser adicionados a um inibidor de corros\u00e3o de alta efici\u00eancia e a um inibidor de n\u00e9voa para evitar a corros\u00e3o do metal, a fragiliza\u00e7\u00e3o por hidrog\u00eanio e a gera\u00e7\u00e3o de n\u00e9voa \u00e1cida. Eles s\u00e3o extremamente adequados para pe\u00e7as pequenas e complexas, mas n\u00e3o s\u00e3o adequados para pasta. S\u00e3o superiores a produtos similares no mercado.<\/p>\n\n\n\n<div class=\"wp-block-cover aligncenter is-light has-custom-content-position is-position-bottom-center\"><img fetchpriority=\"high\" decoding=\"async\" width=\"750\" height=\"406\" class=\"wp-block-cover__image-background wp-image-17366\" alt=\"\" src=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2021\/12\/pickled-and-passivated-of-stainless-steel-welding-line.jpg\" data-object-fit=\"cover\" srcset=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2021\/12\/pickled-and-passivated-of-stainless-steel-welding-line.jpg 750w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2021\/12\/pickled-and-passivated-of-stainless-steel-welding-line-600x325.jpg 600w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2021\/12\/pickled-and-passivated-of-stainless-steel-welding-line-300x162.jpg 300w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2021\/12\/pickled-and-passivated-of-stainless-steel-welding-line-18x10.jpg 18w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim-10 has-background-dim\"><\/span><div class=\"wp-block-cover__inner-container is-layout-flow wp-block-cover-is-layout-flow\">\n<p class=\"has-text-align-center has-large-font-size\">Linha de solda de a\u00e7o inoxid\u00e1vel antes e depois da decapagem<\/p>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">c) Procedimento de Pickling e Passivation: <\/h3>\n\n\n\n<p>De acordo com o material de a\u00e7o inoxid\u00e1vel e a severidade da escala de \u00f3xido, \u00e9 recomendado o uso do l\u00edquido original ou do l\u00edquido original dilu\u00eddo com 1% a 4% \u00e1gua. Para ferrite, martensite e a\u00e7o inoxid\u00e1vel austen\u00edtico com baixo teor de n\u00edquel (tais como 420, 430, 200, 201, 202, 300, 301, etc.), \u00e9 melhor utilizar o l\u00edquido original dilu\u00eddo. Quanto ao a\u00e7o inoxid\u00e1vel austen\u00edtico com alto teor de n\u00edquel (tais como 304, 321, 316, 316L, etc.), \u00e9 melhor mergulh\u00e1-los no l\u00edquido original. Geralmente, o l\u00edquido deve ser aquecido a 50 a 60 graus, e o tempo de imers\u00e3o \u00e9 melhor ser de 3 a 20 minutos ou mais (o tempo e a temperatura podem ser determinados de acordo com as condi\u00e7\u00f5es de ensaio). Depois que a sujeira na superf\u00edcie do a\u00e7o inoxid\u00e1vel \u00e9 completamente removida para aparecer uma superf\u00edcie branca e uniformemente esfarelada, e formar uma pel\u00edcula de passiva\u00e7\u00e3o. Em seguida, retira-se o a\u00e7o inoxid\u00e1vel do l\u00edquido e limpa-se com \u00e1gua clara. Depois disso, neutralizar com \u00e1gua alcalina ou caiada.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Como fazer Pickling e Passivation<\/strong><\/h2>\n\n\n\n<p>Geralmente se refere a um m\u00e9todo para limpar a superf\u00edcie de a\u00e7o inoxid\u00e1vel.<\/p>\n\n\n\n<p>Geralmente, os produtos feitos de a\u00e7o ser\u00e3o embebidos em uma solu\u00e7\u00e3o aquosa como \u00e1cido sulf\u00farico para remover filmes como o \u00f3xido da superf\u00edcie do metal. \u00c9 o pr\u00e9-tratamento ou tratamento intermedi\u00e1rio de galvanoplastia, esmalte, lamina\u00e7\u00e3o e outros processos.<\/p>\n\n\n\n<p>a) A remo\u00e7\u00e3o da escala de \u00f3xido e ferrugem na superf\u00edcie do a\u00e7o atrav\u00e9s do uso de solu\u00e7\u00e3o \u00e1cida \u00e9 chamada decapagem. Para a escala de \u00f3xido, ferrugem e outros \u00f3xidos de ferro (Fe<sub>3<\/sub>O<sub>4<\/sub>, Fe<sub>2<\/sub>O<sub>3<\/sub>FeO, etc.), eles podem reagir com solu\u00e7\u00e3o \u00e1cida para formar um composto de sais, e o composto ser\u00e1 dissolvido e depois removido em solu\u00e7\u00e3o \u00e1cida. Os \u00e1cidos para decapagem incluem \u00e1cido sulf\u00farico, \u00e1cido clor\u00eddrico, \u00e1cido fosf\u00f3rico, \u00e1cido n\u00edtrico, \u00e1cido cr\u00f3mico, \u00e1cido fluor\u00eddrico e \u00e1cido misto. E os mais comumente utilizados s\u00e3o o \u00e1cido sulf\u00farico e o \u00e1cido clor\u00eddrico. Quanto ao processo de decapagem, ele inclui principalmente a decapagem por imers\u00e3o, decapagem por jato e utiliza creme \u00e1cido para remover a ferrugem. Geralmente, a decapagem por imers\u00e3o \u00e9 a mais usada, e a decapagem por jato pode ser usada na produ\u00e7\u00e3o em massa. Quando as pe\u00e7as de a\u00e7o s\u00e3o decapadas em solu\u00e7\u00e3o de \u00e1cido sulf\u00farico, o volume da solu\u00e7\u00e3o \u00e9 de cerca de 10% a 20%, e a temperatura \u00e9 de cerca de 40 graus Celsius. Se o teor de Fe na solu\u00e7\u00e3o exceder 80g\/L e o sulfato ferroso exceder 215g\/L, a solu\u00e7\u00e3o de decapagem deve ser trocada. Sob temperatura normal, o uso de solu\u00e7\u00e3o de \u00e1cido clor\u00eddrico de 20% a 80% em volume para decapagem do a\u00e7o n\u00e3o ser\u00e1 f\u00e1cil de encontrar corros\u00e3o e fragiliza\u00e7\u00e3o por hidrog\u00eanio. Devido aos fortes efeitos de corros\u00e3o que os \u00e1cidos trazem para os metais, h\u00e1 a necessidade de adicionar inibidores de corros\u00e3o. E quando a superf\u00edcie do metal ficar branca como prata ap\u00f3s a limpeza, a superf\u00edcie deve ser passivada para melhorar a resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2021\/12\/pickled-and-passivated-of-stainless-steel-weld-pipe.jpg\" target=\"_blank\"><img decoding=\"async\" width=\"1024\" height=\"574\" src=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2021\/12\/pickled-and-passivated-of-stainless-steel-weld-pipe-1024x574.jpg\" alt=\"decapado e passivado de tubo soldado de a\u00e7o inoxid\u00e1vel\" class=\"wp-image-17374\" srcset=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2021\/12\/pickled-and-passivated-of-stainless-steel-weld-pipe-1024x574.jpg 1024w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2021\/12\/pickled-and-passivated-of-stainless-steel-weld-pipe-600x336.jpg 600w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2021\/12\/pickled-and-passivated-of-stainless-steel-weld-pipe-300x168.jpg 300w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2021\/12\/pickled-and-passivated-of-stainless-steel-weld-pipe-768x430.jpg 768w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2021\/12\/pickled-and-passivated-of-stainless-steel-weld-pipe-18x10.jpg 18w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2021\/12\/pickled-and-passivated-of-stainless-steel-weld-pipe.jpg 1247w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<p>b) A fim de eliminar a adsor\u00e7\u00e3o na superf\u00edcie do suporte de diatomita e reduzir a adapta\u00e7\u00e3o dos picos cromatogr\u00e1ficos, o suporte deve ser decapado ou limpo com alcalinos antes de ser colocado em uso. Antes da decapagem, o portador deve ser embebido e fervido em \u00e1cido clor\u00eddrico 6mol\/L por duas horas ou em \u00e1cido clor\u00eddrico concentrado por trinta minutos. Em seguida, filtr\u00e1-lo, limp\u00e1-lo at\u00e9 ficar neutro com \u00e1gua e sec\u00e1-lo. A decapagem pode remover ferro, alum\u00ednio, c\u00e1lcio, magn\u00e9sio e outras impurezas na superf\u00edcie, mas n\u00e3o pode remover o grupo do silanol. Portanto, o transportador para decapagem deve ser adequado para a an\u00e1lise de amostras \u00e1cidas.<\/p>\n\n\n\n<p>O tratamento de passiva\u00e7\u00e3o \u00e9 o \u00faltimo e principal passo na limpeza qu\u00edmica. Quando a caldeira passa por decapagem, lavagem com \u00e1gua e enx\u00e1g\u00fce, a superf\u00edcie do metal ser\u00e1 muito limpa e ativa, mas tamb\u00e9m ser\u00e1 f\u00e1cil de sofrer corros\u00e3o. Portanto, \u00e9 preciso fazer o tratamento de passiva\u00e7\u00e3o imediatamente, o que pode gerar uma pel\u00edcula de prote\u00e7\u00e3o na superf\u00edcie do metal para retardar a corros\u00e3o.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<ul class=\"wp-block-social-links is-style-default is-layout-flex wp-block-social-links-is-layout-flex\"><\/ul>","protected":false},"featured_media":0,"template":"","categories":[186],"tags":[260],"class_list":["post-17330","blog","type-blog","status-publish","hentry","category-stainless-steel-knowledge","tag-stainless-steel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is Pickling and Passivation for Stainless Steel - KAYSUNS<\/title>\n<meta name=\"description\" content=\"What is Pickling and Passivation for Stainless Steel? 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