{"id":6463,"date":"2020-10-28T06:40:44","date_gmt":"2020-10-28T06:40:44","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=6463"},"modified":"2022-06-30T08:58:26","modified_gmt":"2022-06-30T08:58:26","slug":"corrosao-por-pite-em-tubos-de-aco-inoxidavel-duplex","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/pt\/blog\/corrosao-por-pite-em-tubos-de-aco-inoxidavel-duplex\/","title":{"rendered":"Corros\u00e3o por pite de tubo de a\u00e7o inoxid\u00e1vel duplex"},"content":{"rendered":"

Corros\u00e3o por pite de tubo de a\u00e7o inoxid\u00e1vel duplex<\/a> \u00e9 uma forma de corros\u00e3o que se concentra em uma pequena \u00e1rea na superf\u00edcie do tubo e penetra profundamente no metal. A raz\u00e3o \u00e9 que a falta de homogeneidade eletroqu\u00edmica da superf\u00edcie do metal forma um \u00e2nodo pequeno e concentrado e uma grande c\u00e9lula de corros\u00e3o cat\u00f3dica.<\/p>\n\n\n\n

Como a corros\u00e3o por pite tem uma pequena faixa de caracter\u00edsticas de corros\u00e3o profunda e profunda, o metal perde menos peso no caso de corros\u00e3o por pite, resultando em perfura\u00e7\u00e3o, resultando em pe\u00e7as descartadas e acidentes.<\/p>\n\n\n\n

\"Corros\u00e3o<\/figure>\n\n\n\n

Como isso aconteceu?<\/strong><\/p>\n\n\n\n

O processo de pite \u00e9 dividido principalmente em tr\u00eas est\u00e1gios: est\u00e1gio de inicia\u00e7\u00e3o de pite, est\u00e1gio de pitting metaest\u00e1vel e est\u00e1gio de pitting em estado estacion\u00e1rio.<\/p>\n\n\n\n

No est\u00e1gio de inicia\u00e7\u00e3o da corros\u00e3o por pite, o filme passivo na superf\u00edcie do a\u00e7o inoxid\u00e1vel apresenta as caracter\u00edsticas de descontinuidade e n\u00e3o homogeneidade devido a contornos de gr\u00e3o, deslocamentos e precipita\u00e7\u00e3o. Sob a eros\u00e3o de \u00edons de halog\u00eanio, especialmente \u00edons de cloreto, a\u00e7o inoxid\u00e1vel duplex O filme de passiva\u00e7\u00e3o na superf\u00edcie do tubo se rompeu em um ponto relativamente fraco, levando ao in\u00edcio da corros\u00e3o por pite.<\/p>\n\n\n\n

Os fatores que afetam a prote\u00e7\u00e3o do filme de passiva\u00e7\u00e3o incluem principalmente a composi\u00e7\u00e3o da liga, o meio corrosivo e a temperatura. Os tr\u00eas tipos de mecanismos passivos de ruptura de filme geralmente reconhecidos na pesquisa atual incluem mecanismo de afinamento por adsor\u00e7\u00e3o, mecanismo de penetra\u00e7\u00e3o de migra\u00e7\u00e3o de \u00edons e mecanismo de ruptura passivo de filme. O mecanismo de afinamento por adsor\u00e7\u00e3o foi proposto pela primeira vez por Heussler e Fischer em 1976. Eles acreditavam que os \u00edons cloreto competiam com o oxig\u00eanio pela adsor\u00e7\u00e3o, e os \u00edons cloreto adsorvidos no filme de passiva\u00e7\u00e3o promoveram seu afinamento, levando \u00e0 dissolu\u00e7\u00e3o da matriz met\u00e1lica. No entanto, geralmente acredita-se que o filme de passiva\u00e7\u00e3o \u00e9 uma estrutura de multicamadas, de modo que a adsor\u00e7\u00e3o de \u00edons cloreto e o afinamento s\u00e3o considerados um processo importante, e n\u00e3o uma condi\u00e7\u00e3o necess\u00e1ria para a corros\u00e3o por pite.<\/p>\n\n\n\n

Tubos de a\u00e7o inoxid\u00e1vel<\/a> s\u00e3o propensos \u00e0 ruptura do filme passivo na posi\u00e7\u00e3o fraca ou defeituosa do filme passivo, levando ao in\u00edcio da corros\u00e3o por pite. A corros\u00e3o por pite em estado estacion\u00e1rio s\u00f3 pode ser formada no local da fratura com condi\u00e7\u00f5es de crescimento est\u00e1veis. Este mecanismo resolve efetivamente o problema de estabilidade da corros\u00e3o por pite.<\/p>\n\n\n\n

O crescimento da corros\u00e3o por pite de tubos de a\u00e7o inoxid\u00e1vel duplex \u00e9 controlado por muitos fatores e \u00e9 afetado por fatores como temperatura ambiente, concentra\u00e7\u00e3o de meio corrosivo e potencial an\u00f3dico.<\/p>\n\n\n\n

O in\u00edcio da corros\u00e3o \u00e9 acompanhado pelo progresso da corros\u00e3o metaest\u00e1vel.<\/strong><\/p>\n\n\n\n

No processo de corros\u00e3o metaest\u00e1vel, a corros\u00e3o n\u00e3o continuar\u00e1 a se desenvolver ap\u00f3s um per\u00edodo de inicia\u00e7\u00e3o e desenvolvimento, mas ocorrer\u00e1 passiva\u00e7\u00e3o. A passiva\u00e7\u00e3o ser\u00e1 reparada ap\u00f3s um per\u00edodo de tempo ap\u00f3s a ruptura do filme de passiva\u00e7\u00e3o, que \u00e9 a ruptura e o reparo do filme de passiva\u00e7\u00e3o alternadamente pelo processo A. Esse processo geralmente \u00e9 realizado abaixo da temperatura cr\u00edtica de pite e do potencial de pite cr\u00edtico, e aparece como um min\u00fasculo pico transiente nas flutua\u00e7\u00f5es de corrente.<\/p>\n\n\n\n

A dissolu\u00e7\u00e3o e regenera\u00e7\u00e3o do filme de \u00f3xido dentro das cavidades metaest\u00e1veis s\u00e3o realizadas alternadamente. Quando a taxa de dissolu\u00e7\u00e3o do filme de \u00f3xido \u00e9 maior do que a taxa de regenera\u00e7\u00e3o, a corros\u00e3o metaest\u00e1vel ir\u00e1 gradualmente se desenvolver em uma corros\u00e3o est\u00e1vel; caso contr\u00e1rio, ocorrer\u00e1 passiva\u00e7\u00e3o. Covas em estado estacion\u00e1rio \u00e9 o comportamento de covas que crescem continuamente.<\/p>\n\n\n\n

Postado por fornecedor de acess\u00f3rios para tubos de a\u00e7o inoxid\u00e1vel<\/a> kaysuns.<\/p>","protected":false},"featured_media":6464,"template":"","categories":[186],"tags":[],"class_list":["post-6463","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-stainless-steel-knowledge"],"yoast_head":"\nPitting Corrosion Of Duplex Stainless Steel Pipe - KAYSUNS Pipe Fittings<\/title>\n<meta name=\"description\" content=\"Pitting corrosion of duplex stainless steel pipe is a corrosion that shows on a small area on the surface of pipse and deep into the metal.\" \/>\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\/corrosao-por-pite-em-tubos-de-aco-inoxidavel-duplex\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pitting Corrosion Of Duplex Stainless Steel Pipe - 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