{"id":5830,"date":"2020-04-16T02:23:16","date_gmt":"2020-04-16T02:23:16","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=5830"},"modified":"2025-12-15T07:16:27","modified_gmt":"2025-12-15T07:16:27","slug":"introducao-ao-teste-de-corrosao-em-frestas","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/pt\/blog\/introducao-ao-teste-de-corrosao-em-frestas\/","title":{"rendered":"Introdu\u00e7\u00e3o ao teste de corros\u00e3o em fendas"},"content":{"rendered":"

Breve introdu\u00e7\u00e3o ao projeto de teste de corros\u00e3o em fendas<\/h2>\n\n\n\n

A corros\u00e3o em fendas \u00e9 o fen\u00f4meno em que as superf\u00edcies met\u00e1licas formam fendas devido \u00e0 presen\u00e7a de objetos estranhos ou raz\u00f5es estruturais, resultando em corros\u00e3o met\u00e1lica acelerada nas fendas.<\/p>\n\n\n\n

\"Dispositivo<\/figure>\n\n\n\n

A largura da fenda ou lacuna que causa a corros\u00e3o da fenda deve ser suficiente para permitir que o meio entre e permane\u00e7a nela. Quando a largura da fenda est\u00e1 entre 25 e 100 \u03bcm, \u00e9 a faixa mais sens\u00edvel para corros\u00e3o da fenda. Em algumas fendas mais largas, o meio corrosivo flui facilmente, geralmente n\u00e3o ocorre corros\u00e3o nas fendas.<\/p>\n\n\n\n

O resultado da corros\u00e3o em fendas levar\u00e1 a uma redu\u00e7\u00e3o na resist\u00eancia do componente e a um encaixe incorreto. O aumento do volume dos produtos de corros\u00e3o nas fendas causar\u00e1 tens\u00f5es adicionais locais, o que n\u00e3o s\u00f3 dificulta a montagem, mas tamb\u00e9m pode reduzir a capacidade de carga do componente.<\/p>\n\n\n\n

A corros\u00e3o em fendas de metais mostra as seguintes caracter\u00edsticas principais:<\/h3>\n\n\n\n

(1) Seja o contato do mesmo metal ou de metais diferentes ou o contato entre o metal e o n\u00e3o met\u00e1lico, ou mesmo alguns dep\u00f3sitos e anexos na superf\u00edcie do metal, desde que haja fendas e meios corrosivos que atendam \u00e0 fenda corros\u00e3o, quase toda a corros\u00e3o em fendas ocorre em ligas e metais.<\/p>\n\n\n\n

Ligas ou metais com forte capacidade de autopassiva\u00e7\u00e3o s\u00e3o mais sens\u00edveis \u00e0 corros\u00e3o em fendas.<\/p>\n\n\n\n

(2) Quase todos os meios (incluindo \u00e1gua doce) podem causar corros\u00e3o em fendas de metais, e a solu\u00e7\u00e3o que cont\u00e9m \u00edons de cloreto \u00e9 a mais prov\u00e1vel de causar corros\u00e3o em fendas.<\/p>\n\n\n\n

(3) A superf\u00edcie do metal sujeita \u00e0 corros\u00e3o em fendas pode apresentar corros\u00e3o generalizada ou corros\u00e3o por pite. Materiais com boa resist\u00eancia \u00e0 corros\u00e3o<\/a> geralmente apresentam corros\u00e3o por pite, enquanto materiais com baixa resist\u00eancia \u00e0 corros\u00e3o geralmente apresentam corros\u00e3o total.<\/p>\n\n\n\n

(4) A corros\u00e3o da fenda tem um per\u00edodo de gesta\u00e7\u00e3o, e seu comprimento \u00e9 diferente devido aos diferentes materiais, estrutura da fenda e fatores ambientais. ( ie<\/strong>.: A velocidade de corros\u00e3o da fenda de tubos de a\u00e7o inoxid\u00e1vel<\/a> ou flanges de a\u00e7o inoxid\u00e1vel<\/a> em ambiente seco ser\u00e1 mais lento do que em ambiente \u00famido). As fendas da corros\u00e3o das fendas s\u00e3o frequentemente cobertas por produtos de corros\u00e3o, aumentando assim o efeito de oclus\u00e3o das fendas.<\/p>\n\n\n\n

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

M\u00e9todos de teste e padr\u00f5es de corros\u00e3o em fendas<\/h3>\n\n\n\n
\n \n \n \n \n
M\u00e9todo ASTM G48 B Corros\u00e3o em fendas<\/td>\n GB \/ T 10127 Corros\u00e3o em fendas<\/td>\n <\/tr>\n
M\u00e9todo ASTM G48 D Temperatura cr\u00edtica de corros\u00e3o em frestas de liga contendo cromo \u00e0 base de n\u00edquel para rolamentos<\/td>\n Teste de corros\u00e3o do filamento GB \/ T 13452.4 na superf\u00edcie de metal<\/td>\n <\/tr>\n
M\u00e9todo ASTM G48F Temperatura cr\u00edtica de corros\u00e3o em fendas para a\u00e7o inoxid\u00e1vel <\/td>\n Teste de corros\u00e3o do filamento GB \/ T 26323 em superf\u00edcie de alum\u00ednio e liga de alum\u00ednio<\/td>\n <\/tr>\n
 <\/th>\n JB \/ T 5326 Teste de corros\u00e3o em fendas de materiais met\u00e1licos para instrumento<\/td>\n <\/tr>\n<\/table><\/figure>\n\n\n\n

Requisitos de amostra de corros\u00e3o em fendas<\/strong>
Requisitos de tamanho de amostra de corros\u00e3o em fendas: comprimento 50 mm, largura 25 mm, espessura \u00e9 a espessura real, de prefer\u00eancia 2 ~ 3 mm. A superf\u00edcie da amostra deve ser plana.<\/p>\n\n\n\n

Avalia\u00e7\u00e3o do teste de corros\u00e3o de remo\u00e7\u00e3o de costura<\/strong>
1. Corros\u00e3o em fendas: taxa de corros\u00e3o sem gravidade,
2. Eletroqu\u00edmica de corros\u00e3o em fendas: potencial de corros\u00e3o, corrente de polariza\u00e7\u00e3o vs. curva de tempo, observa\u00e7\u00e3o de corros\u00e3o<\/p>\n\n\n\n

Imagens de amostra de corros\u00e3o em fendas e gr\u00e1ficos de teste<\/strong><\/p>\n\n\n\n

\n
\"Amostra
Amostra<\/figcaption><\/figure>\n\n\n\n
\"Gr\u00e1ficos
Curva de teste<\/figcaption><\/figure>\n<\/figure>","protected":false},"featured_media":5833,"template":"","categories":[186],"tags":[],"class_list":["post-5830","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-stainless-steel-knowledge"],"yoast_head":"\nIntroduction To The Test Of Crevice Corrosion - Stainless Steel Pipe and Fittings | KAYSUNS<\/title>\n<meta name=\"description\" content=\"Crevice corrosion is the phenomenon that metal surfaces form gaps due to the presence of foreign objects or structural reasons, test resulting in accelerated metal corrosion in the gaps.\" \/>\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\/introducao-ao-teste-de-corrosao-em-frestas\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Introduction To The Test Of Crevice Corrosion - 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