{"id":3050,"date":"2022-02-07T06:55:13","date_gmt":"2022-02-07T06:55:13","guid":{"rendered":"https:\/\/3.212.105.250\/?p=3050"},"modified":"2025-01-19T14:20:54","modified_gmt":"2025-01-19T20:20:54","slug":"reconnaitre-et-prevenir-la-corrosion-caverneuse","status":"publish","type":"post","link":"https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2022\/02\/07\/reconnaitre-et-prevenir-la-corrosion-caverneuse\/","title":{"rendered":"Reconna\u00eetre et pr\u00e9venir la corrosion caverneuse"},"content":{"rendered":"<p>La plupart des formes de corrosion sont faciles \u00e0 d\u00e9tecter. Qu'il s'agisse de fissures, de d\u00e9coloration ou de rouille, il y a toujours quelque chose qui la trahit. Mais certaines formes de corrosion sont notoirement sournoises. Ces formes de corrosion font des ravages sur les composants tout en passant inaper\u00e7ues. Souvent, les composants tombent en panne avec peu ou pas d'avertissement, vous laissant sous le choc et vous demandant : \"Que s'est-il pass\u00e9 ici ?\"<\/p>\n<p>L'une de ces formes de corrosion est la corrosion caverneuse, qui se forme dans de petites zones isol\u00e9es et s'\u00e9tend \u00e0 des zones qui ne sont pas facilement visibles. Bien que la corrosion caverneuse soit difficile \u00e0 d\u00e9tecter, vous pouvez toujours l'attraper aux premiers stades si vous \u00eates perspicace et pers\u00e9v\u00e9rant. Dans ce guide de reconnaissance et de pr\u00e9vention de la corrosion caverneuse, nous vous pr\u00e9senterons les principes de base de la corrosion caverneuse et vous enseignerons comment la rep\u00e9rer et la pr\u00e9venir efficacement. Commen\u00e7ons par le commencement.<\/p>\n<h2>Qu'est-ce que la corrosion caverneuse ?<\/h2>\n<p>La corrosion caverneuse, \u00e9galement connue sous le nom de corrosion par d\u00e9p\u00f4t ou par joint, est une forme de corrosion qui se produit lorsque l'on se trouve en pr\u00e9sence d'un joint. <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2021\/06\/15\/ce-que-vous-pouvez-faire-contre-la-corrosion-localisee\/'>forme localis\u00e9e de corrosion<\/a> qui s'attaque \u00e0 l'espace, ou crevasse, entre les surfaces jointes. Elle peut affecter les crevasses m\u00e9tal-m\u00e9tal et m\u00e9tal-non-m\u00e9tal. Lorsqu'elle n'est pas contr\u00f4l\u00e9e, la corrosion caverneuse peut entra\u00eener la fissuration des mat\u00e9riaux et, \u00e0 terme, la d\u00e9faillance d'un composant ou d'une structure.<\/p>\n<h2>Quelles sont les causes de la corrosion caverneuse ?<\/h2>\n<p>L'\u00e9tape suivante pour reconna\u00eetre et pr\u00e9venir la corrosion caverneuse consiste \u00e0 en comprendre les causes. La corrosion caverneuse se produit en raison de compositions chimiques diff\u00e9rentes \u00e0 certains endroits pr\u00e8s des surfaces jointes. Cette diff\u00e9rence de composition chimique se produit lorsque de l'air, de l'eau ou un autre \u00e9l\u00e9ment corrosif s'infiltre dans une petite fissure entre des mat\u00e9riaux et y reste pi\u00e9g\u00e9.<\/p>\n<p>Cette stagnation provoque une r\u00e9action chimique qui appauvrit la r\u00e9gion en oxyg\u00e8ne et inonde l'anfractuosit\u00e9 d'ions m\u00e9talliques positifs, transformant l'anfractuosit\u00e9 en anode. Ensuite, les ions n\u00e9gatifs contrebalancent l'afflux d'ions positifs, cr\u00e9ant un acide qui attaque et ronge le film d'oxyde protecteur de l'un ou des deux mat\u00e9riaux.<\/p>\n<h2>La corrosion caverneuse et la corrosion par piq\u00fbres sont-elles identiques ?<\/h2>\n<p>De nombreuses personnes pensent que la corrosion caverneuse et la corrosion par piq\u00fbres sont identiques car elles fonctionnent et se manifestent de mani\u00e8re similaire. Ces deux formes de corrosion sont dues \u00e0 la d\u00e9gradation du film d'oxyde protecteur d'un mat\u00e9riau. Elles peuvent \u00e9galement toutes deux entra\u00eener la formation de piq\u00fbres. Toutefois, la corrosion par piq\u00fbres affecte la totalit\u00e9 de la surface d'un m\u00e9tal, tandis que la corrosion caverneuse affecte exclusivement la zone situ\u00e9e \u00e0 l'int\u00e9rieur et autour des crevasses. La corrosion par piq\u00fbres est souvent plus grave, mais la corrosion caverneuse est plus difficile \u00e0 d\u00e9tecter et beaucoup plus susceptible de provoquer la d\u00e9faillance d'un composant ou d'une structure.<\/p>\n<h2>Comment reconna\u00eetre la corrosion caverneuse<\/h2>\n<p>Vous avez le plus de chances de trouver de la corrosion caverneuse dans les zones de jonction de deux mat\u00e9riaux, par exemple sous les rondelles, les joints et les colliers, ou aux points de jonction des poutres et des plaques. Les signes courants de corrosion caverneuse sont les suivants<\/p>\n<ul>\n<li>D\u00e9coloration de la peinture pr\u00e8s des zones de jonction<\/li>\n<li>Le rev\u00eatement protecteur s'\u00e9caille au niveau des fissures ou \u00e0 proximit\u00e9 de celles-ci<\/li>\n<li>L'\u00e9caillage du mat\u00e9riau \u00e0 proximit\u00e9 des zones de jonction<\/li>\n<\/ul>\n<p>Les signes de la corrosion caverneuse sont subtils et souvent n\u00e9glig\u00e9s. Ils peuvent \u00e9galement \u00eatre difficiles \u00e0 rep\u00e9rer, car de nombreuses crevasses sont extr\u00eamement petites (seulement quelques microm\u00e8tres de large) ou masqu\u00e9es par des \u00e9crans de protection. Si vous ne recherchez pas activement les signes de corrosion caverneuse, vous risquez de ne pas les remarquer avant qu'il ne soit trop tard !<\/p>\n<p>Si vous constatez une ou plusieurs de ces particularit\u00e9s, ne les n\u00e9gligez pas. Il peut s'agir d'un signe avant-coureur de corrosion caverneuse. La reconnaissance et le traitement pr\u00e9coces de la corrosion caverneuse sont essentiels pour pr\u00e9venir les dommages graves et les d\u00e9faillances.<\/p>\n<h2>Quels sont les mat\u00e9riaux les plus expos\u00e9s ?<\/h2>\n<p>Certains mat\u00e9riaux sont plus sensibles \u00e0 cette forme de corrosion que d'autres. Les facteurs qui influencent la corrosion caverneuse sont les suivants :<\/p>\n<h3>Le type de crevasse<\/h3>\n<p>S'agit-il d'une crevasse m\u00e9tal-m\u00e9tal ou m\u00e9tal-non-m\u00e9tal ?<\/p>\n<h3>La g\u00e9om\u00e9trie<\/h3>\n<p>Quelle est la taille et la profondeur de la fissure ? Quelle est la rugosit\u00e9 de la surface ?<\/p>\n<h3>Le mat\u00e9riel<\/h3>\n<p>Quelle est la composition de l'alliage de la crevasse ?<\/p>\n<h3>L'environnement<\/h3>\n<p>Quel est le pH de l'air et du sol environnants ? Quelle est la teneur en oxyg\u00e8ne de l'air ? Quelles sont les conditions m\u00e9t\u00e9orologiques et la temp\u00e9rature dans la r\u00e9gion ? Combien d'ions halog\u00e9nures et chlorures y a-t-il dans l'environnement ?<\/p>\n<p>En g\u00e9n\u00e9ral, les mat\u00e9riaux les plus sensibles \u00e0 la corrosion caverneuse sont les alliages filmog\u00e8nes dont la r\u00e9sistance \u00e0 la corrosion repose sur la stabilit\u00e9 des films passifs (c'est-\u00e0-dire le film d'oxyde protecteur). Il s'agit notamment des alliages d'aluminium et des aciers inoxydables de toutes qualit\u00e9s.<\/p>\n<h2>Pr\u00e9vention de la corrosion par crevasses<\/h2>\n<p>Heureusement, comme pour la plupart des formes de corrosion, il est possible de pr\u00e9venir la corrosion caverneuse. Les principales m\u00e9thodes de pr\u00e9vention de la corrosion caverneuse sont les suivantes :<\/p>\n<ul>\n<li>\u00c9liminer les petites fissures qui peuvent pi\u00e9ger les agents de corrosion (vous pouvez sceller les fissures par soudage continu ou par brasage).<\/li>\n<li>Utilisation d'alliages \u00e0 haute teneur qui r\u00e9sistent \u00e0 la corrosion caverneuse (les mat\u00e9riaux r\u00e9sistants \u00e0 la corrosion par piq\u00fbres sont souvent \u00e9galement r\u00e9sistants \u00e0 la corrosion caverneuse).<\/li>\n<li>Drainage et s\u00e9chage des zones sensibles apr\u00e8s la pluie ou la neige pour \u00e9viter la stagnation<\/li>\n<li>Utilisation de joints soud\u00e9s bout \u00e0 bout au lieu de joints boulonn\u00e9s ou filet\u00e9s<\/li>\n<li>Utilisation de joints non absorbants en t\u00e9flon<\/li>\n<\/ul>\n<h2>Pouvez-vous inverser la corrosion caverneuse ?<\/h2>\n<p>Malheureusement, il n'existe aucun moyen d'inverser les dommages caus\u00e9s par la corrosion. Cela dit, vous pouvez toujours prendre les mesures mentionn\u00e9es ci-dessus pour emp\u00eacher la corrosion de s'\u00e9tendre et d'endommager davantage le mat\u00e9riau. Il est souvent possible de r\u00e9cup\u00e9rer des \u00e9l\u00e9ments peu corrod\u00e9s, mais vous devrez remplacer les \u00e9l\u00e9ments fortement corrod\u00e9s ou d\u00e9faillants. Heureusement, en prenant des mesures pr\u00e9ventives, vous \u00e9viterez que les mat\u00e9riaux de remplacement ne subissent le m\u00eame sort que les mat\u00e9riaux qui les ont pr\u00e9c\u00e9d\u00e9s.<\/p>\n<p>Un moyen courant de pr\u00e9venir la corrosion du m\u00e9tal est <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/domaines-de-consultation\/corrosion\/etudes-de-potentiel-de-protection-cathodique\/'>la protection cathodique,<\/a> une technique qui pr\u00e9vient la corrosion en transformant le m\u00e9tal en cathode d'une cellule \u00e9lectrochimique. Si vous souhaitez essayer <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2023\/03\/10\/ingenieurs-en-protection-cathodique\/'>protection cathodique<\/a> comme m\u00e9thode de pr\u00e9vention de la corrosion, Dreiym Engineering peut vous aider. Nous proposons une protection cathodique <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/domaines-de-consultation\/conseil-en-criminalistique\/explosion-de-feu\/systeme-de-stockage-denergie-residentiel-service-denquete-sur-les-incendies\/'>services de conception et d'installation de syst\u00e8mes<\/a>. Et pour ceux qui disposent d\u00e9j\u00e0 d'un syst\u00e8me de protection cathodique, nous proposons \u00e9galement\u00a0<a href=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/services\/corrosion\/tests-dinterference\/\"><strong>essais de protection cathodique<\/strong><\/a>\u00a0afin de garantir que votre syst\u00e8me continue \u00e0 fonctionner comme pr\u00e9vu.<\/p>\n<p>Nos ing\u00e9nieurs professionnels agr\u00e9\u00e9s sont tous certifi\u00e9s CP3 ou CP4 et ont des ann\u00e9es d'exp\u00e9rience en mati\u00e8re d'essais. <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2020\/10\/22\/facteurs-affectant-la-protection-cathodique\/'>protection cathodique<\/a> syst\u00e8mes. Vous pouvez compter sur notre \u00e9quipe pour effectuer rapidement des \u00e9valuations de votre syst\u00e8me et vous fournir les informations dont vous avez besoin pour garder votre <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2024\/06\/11\/repenser-la-protection-cathodique-tendances-actuelles-et-meilleures-pratiques\/'>protection cathodique<\/a> syst\u00e8me en excellent \u00e9tat.<\/p>\n<p>Contactez-nous d\u00e8s aujourd'hui si vous avez des questions ou si vous souhaitez en savoir plus sur nos services. <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2023\/05\/17\/4-methodes-dessai-de-la-protection-cathodique\/'>installation et essais de protection cathodique<\/a> les services.<\/p>\n<img decoding=\"async\" class=\"aligncenter wp-image-3940 size-full\" src=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Preventing-Crevice-Corrosion.jpg\" alt=\"Reconna\u00eetre et pr\u00e9venir la corrosion caverneuse\" width=\"800\" height=\"2000\" srcset=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Preventing-Crevice-Corrosion.jpg 800w, https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Preventing-Crevice-Corrosion-120x300.jpg 120w, https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Preventing-Crevice-Corrosion-768x1920.jpg 768w, https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Preventing-Crevice-Corrosion-614x1536.jpg 614w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>","protected":false},"excerpt":{"rendered":"<p>Most forms of corrosion are easy to detect. Whether it\u2019s the cracking, the discoloration, or the rust, there\u2019s something that gives it away. But there are some forms of corrosion that are notoriously sneaky. These forms of corrosion wreak havoc on components while sneaking under the radar. Often, components will fail with little to no [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":3454,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_mbp_gutenberg_autopost":false,"_pgmb_is_evergreen":true,"_pgmb_ap_template_id":0,"iawp_total_views":341,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-3050","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-corrosion-and-cathodic-protection"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.9.6.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"Most forms of corrosion are easy to detect. 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But there are\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2022\/02\/07\/reconnaitre-et-prevenir-la-corrosion-caverneuse\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Recognizing-and-Preventing-Crevice-Corrosion.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Recognizing-and-Preventing-Crevice-Corrosion.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"708\" \/>\n\t\t<meta property=\"og:image:height\" content=\"425\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2022-02-07T06:55:13+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2025-01-19T20:20:54+00:00\" \/>\n\t\t<script type=\"application\/ld+json\" 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