{"id":5874,"date":"2020-05-08T06:20:49","date_gmt":"2020-05-08T06:20:49","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=5874"},"modified":"2026-03-25T03:44:14","modified_gmt":"2026-03-25T03:44:14","slug":"a-necessidade-de-decapagem-e-passivacao-de-tubos-de-aco-inoxidavel","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/pt\/blog\/a-necessidade-de-decapagem-e-passivacao-de-tubos-de-aco-inoxidavel\/","title":{"rendered":"A necessidade de decapagem e passiva\u00e7\u00e3o de tubos de a\u00e7o inoxid\u00e1vel"},"content":{"rendered":"

A resist\u00eancia \u00e0 corros\u00e3o dos tubos de a\u00e7o inoxid\u00e1vel depende principalmente da camada superficial de passiva\u00e7\u00e3o<\/h2>\n\n\n
\n
\"Decapagem<\/figure>\n<\/div>\n\n\n

Tubo de a\u00e7o inoxid\u00e1vel, como tubo duplex e acess\u00f3rios<\/a> tem boa resist\u00eancia \u00e0 corros\u00e3o, resist\u00eancia \u00e0 oxida\u00e7\u00e3o em alta temperatura, bom desempenho em baixa temperatura e excelente desempenho mec\u00e2nico e de processamento. Portanto, \u00e9 amplamente utilizado na qu\u00edmica, petr\u00f3leo, energia, engenharia nuclear, aeroespacial, marinha, farmac\u00eautica, ind\u00fastria leve, t\u00eaxtil e outros setores. <\/p>\n\n\n\n

A resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel depende principalmente da camada superficial de passiva\u00e7\u00e3o. Se estiver incompleto ou com defeito, o tubo de a\u00e7o inoxid\u00e1vel ainda estar\u00e1 corro\u00eddo.<\/p>\n\n\n\n

Princ\u00edpio da tubo duplex<\/a>, tubo de a\u00e7o inoxid\u00e1vel sem costura<\/a> decapagem e passiva\u00e7\u00e3o:<\/strong><\/p>\n\n\n\n

A resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel \u00e9 principalmente porque a superf\u00edcie \u00e9 coberta com uma camada de passiva\u00e7\u00e3o densa muito fina (cerca de 1 nm), que \u00e9 a barreira b\u00e1sica para a prote\u00e7\u00e3o do a\u00e7o inoxid\u00e1vel.<\/p>\n\n\n\n

A passiva\u00e7\u00e3o do a\u00e7o inoxid\u00e1vel possui caracter\u00edsticas din\u00e2micas. N\u00e3o se deve considerar que a corros\u00e3o parou completamente, mas que forma uma barreira de difus\u00e3o, o que reduz muito a taxa de rea\u00e7\u00e3o an\u00f3dica. Na presen\u00e7a de elementos redutores (como \u00edons cloreto) tendem a destruir a camada, e na presen\u00e7a de subst\u00e2ncias oxidantes (como o ar) podem manter ou reparar a camada.<\/p>\n\n\n\n

o tubo de a\u00e7o inoxid\u00e1vel<\/a> a pe\u00e7a de trabalho formar\u00e1 uma camada de \u00f3xido quando colocada no ar, mas esse filme n\u00e3o \u00e9 t\u00e3o protetor quanto a camada de passiva\u00e7\u00e3o.<\/p>\n\n\n\n

Geralmente, uma limpeza completa \u00e9 necess\u00e1ria, incluindo limpeza alcalina e limpeza \u00e1cida, e ent\u00e3o a passiva\u00e7\u00e3o com um agente oxidante pode garantir a integridade e estabilidade da camada de passiva\u00e7\u00e3o.<\/p>\n\n\n\n

Um dos objetivos da decapagem \u00e9 criar condi\u00e7\u00f5es favor\u00e1veis para o tratamento de passiva\u00e7\u00e3o e garantir a forma\u00e7\u00e3o de uma camada de passiva\u00e7\u00e3o de alta qualidade. Por decapagem, a superf\u00edcie do tubo de a\u00e7o inoxid\u00e1vel \u00e9 corro\u00edda com uma espessura m\u00e9dia de 10 \u03bcm, o que pode fazer com que toda a superf\u00edcie tenda a ficar uniformemente equilibrada, e alguns perigos ocultos que s\u00e3o f\u00e1ceis de causar corros\u00e3o s\u00e3o eliminados.<\/p>\n\n\n\n

Mais importante ainda, por meio do \u00e1cido decapagem e passiva\u00e7\u00e3o<\/a>, Na superf\u00edcie do a\u00e7o inoxid\u00e1vel, o ferro e os \u00f3xidos de ferro s\u00e3o dissolvidos preferencialmente em rela\u00e7\u00e3o ao cromo e aos \u00f3xidos de cromo, e a camada empobrecida de cromo \u00e9 removida, resultando no enriquecimento de cromo na superf\u00edcie do a\u00e7o inoxid\u00e1vel. O potencial pode chegar a + 1,0 V (SCE), que \u00e9 pr\u00f3ximo ao potencial de metais preciosos, o que melhora a estabilidade da resist\u00eancia \u00e0 corros\u00e3o.<\/p>\n\n\n\n

Diferentes tratamentos de passiva\u00e7\u00e3o ir\u00e3o formar diferentes resist\u00eancias \u00e0 corros\u00e3o. Por meio do tratamento eletroqu\u00edmico, a camada de passiva\u00e7\u00e3o pode ter uma estrutura multicamadas, formando uma camada de CrO3, Cr2O3 ou \u00f3xido v\u00edtreo na camada superficial, de modo que o tubo de a\u00e7o inoxid\u00e1vel possa exercer a m\u00e1xima resist\u00eancia \u00e0 corros\u00e3o.<\/p>","protected":false},"featured_media":5875,"template":"","categories":[186],"tags":[],"class_list":["post-5874","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-stainless-steel-knowledge"],"yoast_head":"\nThe Necessity Of Pickling And Passivation Of Stainless Steel Pipes - Stainless Steel Pipe and Fittings | KAYSUNS<\/title>\n<meta name=\"description\" content=\"The corrosion resistance of stainless steel mainly depends on the surface passivation layer. 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