{"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":"corrosion-par-piqures-des-tuyaux-en-acier-inoxydable-duplex","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/fr\/blog\/corrosion-par-piqures-des-tuyaux-en-acier-inoxydable-duplex\/","title":{"rendered":"Corrosion par piq\u00fbres de tuyaux en acier inoxydable duplex"},"content":{"rendered":"<p>Corrosion par piq\u00fbres de <a href=\"https:\/\/www.kaysuns.com\/fr\/duplex-2205-stainless-steel-pipe\/\" target=\"_blank\">tuyau en acier inoxydable duplex<\/a> est une forme de corrosion qui se concentre sur une petite zone \u00e0 la surface du tuyau et p\u00e9n\u00e8tre profond\u00e9ment dans le m\u00e9tal. La raison en est que l&#039;inhomog\u00e9n\u00e9it\u00e9 \u00e9lectrochimique de la surface m\u00e9tallique forme une petite anode concentr\u00e9e et une grande cellule de corrosion cathodique.<\/p>\n\n\n\n<p>\u00c9tant donn\u00e9 que la corrosion par piq\u00fbres a une petite gamme de caract\u00e9ristiques de corrosion profonde et profonde, le m\u00e9tal perd moins de poids dans le cas de corrosion par piq\u00fbres, entra\u00eenant une perforation, entra\u00eenant des pi\u00e8ces mises au rebut et des accidents.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"694\" src=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/10\/Pitting-corrosion-of-duplex-stainless-steel-pipe-and-316-pipe-1024x694.jpg\" alt=\"Corrosion par piq\u00fbres des tuyaux duplex et des tuyaux 316L\" class=\"wp-image-6464\" srcset=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/10\/Pitting-corrosion-of-duplex-stainless-steel-pipe-and-316-pipe-1024x694.jpg 1024w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/10\/Pitting-corrosion-of-duplex-stainless-steel-pipe-and-316-pipe-300x203.jpg 300w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/10\/Pitting-corrosion-of-duplex-stainless-steel-pipe-and-316-pipe-768x521.jpg 768w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/10\/Pitting-corrosion-of-duplex-stainless-steel-pipe-and-316-pipe.jpg 1114w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>Comment est-ce arriv\u00e9?<\/strong><\/p>\n\n\n\n<p>Le processus de piq\u00fbre est principalement divis\u00e9 en trois \u00e9tapes : \u00e9tape d&#039;initiation de la piq\u00fbre, \u00e9tape de piq\u00fbre m\u00e9tastable et \u00e9tape de piq\u00fbre en r\u00e9gime permanent.<\/p>\n\n\n\n<p>Au stade d&#039;initiation de la corrosion par piq\u00fbres, le film passif \u00e0 la surface de l&#039;acier inoxydable pr\u00e9sente des caract\u00e9ristiques de discontinuit\u00e9 et d&#039;inhomog\u00e9n\u00e9it\u00e9 dues aux joints de grains, aux dislocations et aux pr\u00e9cipitations. Sous l&#039;\u00e9rosion des ions halog\u00e8nes, en particulier des ions chlorure, l&#039;acier inoxydable duplex Le film de passivation \u00e0 la surface du tuyau s&#039;est rompu \u00e0 un point relativement faible, entra\u00eenant l&#039;initiation de la corrosion par piq\u00fbres.<\/p>\n\n\n\n<p>Les facteurs qui affectent la protection du film de passivation comprennent principalement la composition de l&#039;alliage, le milieu corrosif et la temp\u00e9rature. Les trois types de m\u00e9canismes de rupture de film passif g\u00e9n\u00e9ralement reconnus dans la recherche actuelle comprennent le m\u00e9canisme d&#039;amincissement par adsorption, le m\u00e9canisme de p\u00e9n\u00e9tration de la migration des ions et le m\u00e9canisme de rupture de film passif. Le m\u00e9canisme d&#039;amincissement par adsorption a \u00e9t\u00e9 propos\u00e9 pour la premi\u00e8re fois par Heussler et Fischer en 1976. Ils pensaient que les ions chlorure \u00e9taient en comp\u00e9tition avec l&#039;oxyg\u00e8ne pour l&#039;adsorption et que les ions chlorure adsorb\u00e9s sur le film de passivation favorisaient son amincissement, entra\u00eenant la dissolution de la matrice m\u00e9tallique. Cependant, il est g\u00e9n\u00e9ralement admis que le film de passivation est une structure multicouche, de sorte que l&#039;adsorption et l&#039;amincissement des ions chlorure sont consid\u00e9r\u00e9s comme un processus important plut\u00f4t que comme une condition n\u00e9cessaire \u00e0 la corrosion par piq\u00fbres.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.kaysuns.com\/fr\/tuyaux-en-acier-inoxydable\/\" target=\"_blank\">Tuyaux en acier inoxydable<\/a> sont sujettes \u00e0 la rupture du film passif au niveau de la position faible ou d\u00e9fectueuse du film passif, conduisant \u00e0 l&#039;initiation de la corrosion par piq\u00fbres. La corrosion par piq\u00fbres \u00e0 l&#039;\u00e9tat stable ne peut se former qu&#039;au site de fracture dans des conditions de croissance stables. Ce m\u00e9canisme r\u00e9sout efficacement le probl\u00e8me de stabilit\u00e9 de la corrosion par piq\u00fbres.<\/p>\n\n\n\n<p>La croissance de la corrosion par piq\u00fbres des tuyaux en acier inoxydable duplex est contr\u00f4l\u00e9e par de nombreux facteurs et est affect\u00e9e par des facteurs tels que la temp\u00e9rature ambiante, la concentration en milieu corrosif et le potentiel anodique.<\/p>\n\n\n\n<p><strong>L&#039;initiation des piq\u00fbres s&#039;accompagne de la progression des piq\u00fbres m\u00e9tastables.<\/strong><\/p>\n\n\n\n<p>Dans le processus de piq\u00fbre m\u00e9tastable, la piq\u00fbre ne continuera pas \u00e0 se d\u00e9velopper apr\u00e8s une p\u00e9riode d&#039;initiation et de d\u00e9veloppement, mais la passivation se produira. La passivation sera r\u00e9par\u00e9e apr\u00e8s une p\u00e9riode de temps apr\u00e8s la rupture du film de passivation, qui est la rupture et la r\u00e9paration du film de passivation alternativement Un processus. Ce processus est g\u00e9n\u00e9ralement effectu\u00e9 en dessous de la temp\u00e9rature de piq\u00fbre critique et du potentiel de piq\u00fbre critique, et appara\u00eet comme un petit pic transitoire dans les fluctuations de courant.<\/p>\n\n\n\n<p>La dissolution et la r\u00e9g\u00e9n\u00e9ration du film d&#039;oxyde \u00e0 l&#039;int\u00e9rieur des piq\u00fbres m\u00e9tastables sont effectu\u00e9es alternativement. Lorsque la vitesse de dissolution du film d&#039;oxyde est sup\u00e9rieure \u00e0 la vitesse de r\u00e9g\u00e9n\u00e9ration, la piq\u00fbre m\u00e9tastable se d\u00e9veloppera progressivement en une piq\u00fbre \u00e0 l&#039;\u00e9tat stable ; sinon, la passivation se produira. Les piq\u00fbres \u00e0 l&#039;\u00e9tat stable sont le comportement de piq\u00fbres des piq\u00fbres qui se d\u00e9veloppent r\u00e9guli\u00e8rement.<\/p>\n\n\n\n<p>Post\u00e9 par <a href=\"https:\/\/www.kaysuns.com\/fr\/\" target=\"_blank\">fournisseur de raccords de tuyauterie en acier inoxydable<\/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":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Pitting 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\/fr\/blog\/corrosion-par-piqures-des-tuyaux-en-acier-inoxydable-duplex\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pitting Corrosion Of Duplex Stainless Steel Pipe - 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