{"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":"introduction-au-test-de-corrosion-caverneuse","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/fr\/blog\/introduction-au-test-de-corrosion-caverneuse\/","title":{"rendered":"Introduction au test de corrosion caverneuse"},"content":{"rendered":"

Br\u00e8ve introduction du projet de test de corrosion caverneuse<\/h2>\n\n\n\n

La corrosion caverneuse est le ph\u00e9nom\u00e8ne selon lequel les surfaces m\u00e9talliques forment des espaces en raison de la pr\u00e9sence d'objets \u00e9trangers ou pour des raisons structurelles, entra\u00eenant une corrosion acc\u00e9l\u00e9r\u00e9e du m\u00e9tal dans les espaces.<\/p>\n\n\n\n

\"Appareil<\/figure>\n\n\n\n

La largeur de la fente ou de l'espace qui provoque la corrosion caverneuse doit \u00eatre suffisante pour permettre au fluide d'entrer et d'y rester. Lorsque la largeur de crevasse est comprise entre 25 et 100 m, c'est la plage la plus sensible \u00e0 la corrosion caverneuse. Dans certaines crevasses plus larges, le milieu corrosif s'\u00e9coule facilement, la corrosion caverneuse ne se produit g\u00e9n\u00e9ralement pas.<\/p>\n\n\n\n

Le r\u00e9sultat de la corrosion caverneuse entra\u00eenera une r\u00e9duction de la r\u00e9sistance du composant et un mauvais ajustement. L'augmentation du volume des produits de corrosion dans les anfractuosit\u00e9s va provoquer des contraintes locales suppl\u00e9mentaires, ce qui non seulement rend le montage difficile, mais peut \u00e9galement r\u00e9duire la capacit\u00e9 portante de la pi\u00e8ce.<\/p>\n\n\n\n

La corrosion caverneuse des m\u00e9taux pr\u00e9sente les principales caract\u00e9ristiques suivantes\u00a0:<\/h3>\n\n\n\n

(1) Qu'il s'agisse du contact de m\u00e9taux identiques ou diff\u00e9rents ou du contact entre le m\u00e9tal et le non-m\u00e9tal, ou m\u00eame certains d\u00e9p\u00f4ts et attachements sur la surface m\u00e9tallique, tant qu'il y a des fentes et des milieux corrosifs qui rencontrent la crevasse corrosion, presque toute la corrosion caverneuse se produit dans les alliages et les m\u00e9taux.<\/p>\n\n\n\n

Les alliages ou m\u00e9taux \u00e0 forte capacit\u00e9 d'auto-passivation sont plus sensibles \u00e0 la corrosion caverneuse.<\/p>\n\n\n\n

(2) Presque tous les milieux (y compris l'eau douce) peuvent provoquer une corrosion caverneuse des m\u00e9taux, et la solution contenant des ions chlorure est la plus susceptible de provoquer une corrosion caverneuse.<\/p>\n\n\n\n

(3) La surface du m\u00e9tal soumis \u00e0 la corrosion par crevasses peut pr\u00e9senter soit une corrosion g\u00e9n\u00e9ralis\u00e9e, soit une corrosion par piq\u00fbres. Les mat\u00e9riaux pr\u00e9sentant une bonne r\u00e9sistance \u00e0 la corrosion<\/a> pr\u00e9sentent g\u00e9n\u00e9ralement une corrosion par piq\u00fbres, tandis que les mat\u00e9riaux ayant une faible r\u00e9sistance \u00e0 la corrosion pr\u00e9sentent g\u00e9n\u00e9ralement une corrosion compl\u00e8te.<\/p>\n\n\n\n

(4) La corrosion caverneuse a une p\u00e9riode de gestation et sa longueur est diff\u00e9rente en raison des diff\u00e9rents mat\u00e9riaux, de la structure des crevasses et des facteurs environnementaux.( c'est \u00e0 dire<\/strong>.: La vitesse de corrosion caverneuse de tuyaux en acier inoxydable<\/a> ou brides en acier inoxydable<\/a> dans un environnement sec sera plus lent que dans un environnement humide) Les crevasses de la corrosion caverneuse sont souvent recouvertes de produits de corrosion, renfor\u00e7ant ainsi l'effet d'occlusion des crevasses.<\/p>\n\n\n\n

\"corrosion<\/figure>\n\n\n\n

M\u00e9thodes d'essai et normes de corrosion caverneuse<\/h3>\n\n\n\n
\n \n \n \n \n
M\u00e9thode ASTM G48B Corrosion caverneuse<\/td>\n GB\/T 10127 Corrosion caverneuse<\/td>\n <\/tr>\n
M\u00e9thode ASTM G48D Temp\u00e9rature critique de corrosion caverneuse d'un alliage \u00e0 base de nickel contenant du chrome pour les roulements<\/td>\n GB\/T 13452.4 Test de corrosion des filaments sur la surface m\u00e9tallique<\/td>\n <\/tr>\n
M\u00e9thode ASTM G48F Temp\u00e9rature critique de corrosion caverneuse pour l'acier inoxydable <\/td>\n GB\/T 26323 Essai de corrosion de filament sur la surface d'aluminium et d'alliage d'aluminium<\/td>\n <\/tr>\n
 <\/th>\n JB\/T 5326 Essai de corrosion caverneuse des mat\u00e9riaux m\u00e9talliques pour instrument<\/td>\n <\/tr>\n<\/table><\/figure>\n\n\n\n

Exigences relatives aux \u00e9chantillons de corrosion caverneuse<\/strong>
Exigences de taille d'\u00e9chantillon de corrosion caverneuse\u00a0: longueur 50\u00a0mm, largeur 25\u00a0mm, l'\u00e9paisseur est l'\u00e9paisseur r\u00e9elle, de pr\u00e9f\u00e9rence 2 \u00e0 3\u00a0mm. La surface de l'\u00e9chantillon doit \u00eatre plane.<\/p>\n\n\n\n

\u00c9valuation du test de corrosion par enl\u00e8vement de couture<\/strong>
1. Corrosion caverneuse\u00a0: taux de corrosion en apesanteur,
2. Electrochimie de corrosion caverneuse : potentiel de corrosion, courant de polarisation en fonction du temps, observation de la corrosion<\/p>\n\n\n\n

Images d'\u00e9chantillons de corrosion caverneuse et tableaux de test<\/strong><\/p>\n\n\n\n

\n
\"\u00c9chantillon
\u00c9chantillon<\/figcaption><\/figure>\n\n\n\n
\"Tableaux
Courbe d'essai<\/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\/fr\/blog\/introduction-au-test-de-corrosion-caverneuse\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Introduction To The Test Of Crevice Corrosion - 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