{"id":3053,"date":"2022-02-28T06:55:52","date_gmt":"2022-02-28T06:55:52","guid":{"rendered":"https:\/\/3.212.105.250\/?p=3053"},"modified":"2025-01-17T18:04:35","modified_gmt":"2025-01-18T00:04:35","slug":"comment-identifier-et-eliminer-la-corrosion-par-piqures","status":"publish","type":"post","link":"https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2022\/02\/28\/comment-identifier-et-eliminer-la-corrosion-par-piqures\/","title":{"rendered":"Comment identifier et \u00e9liminer la corrosion par piq\u00fbres"},"content":{"rendered":"<p>La corrosion est l'ennemie des m\u00e9taux de toutes sortes. Ce processus dommageable entra\u00eene la rouille et la d\u00e9gradation progressive des mat\u00e9riaux m\u00e9talliques. Souvent, elle attaque sournoisement, ind\u00e9tectable jusqu'\u00e0 ce que les d\u00e9g\u00e2ts soient d\u00e9j\u00e0 faits.<\/p>\n<p>Ce qui rend la corrosion encore plus difficile \u00e0 d\u00e9tecter et \u00e0 pr\u00e9venir, c'est qu'elle se pr\u00e9sente sous de nombreuses formes. L'une d'entre elles est la corrosion par piq\u00fbres, consid\u00e9r\u00e9e comme l'une des formes de corrosion les plus sournoises et les plus dommageables. La corrosion par piq\u00fbres peut d\u00e9figurer les surfaces m\u00e9talliques et compromettre leur stabilit\u00e9.<\/p>\n<p>Dans ce guide, nous donnerons un bref aper\u00e7u de la corrosion par piq\u00fbres, de son r\u00f4le et de ses causes. Nous verrons \u00e9galement comment identifier et \u00e9liminer la corrosion par piq\u00fbres. Poursuivez votre lecture pour en savoir plus sur cette forme unique de corrosion et sur la mani\u00e8re de l'emp\u00eacher de d\u00e9vaster vos tuyaux et autres composants m\u00e9talliques.<\/p>\n<h2>Qu'est-ce que la corrosion par piq\u00fbres ?<\/h2>\n<p>La corrosion par piq\u00fbres, plus connue sous le nom de piq\u00fbres, est un type de <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2021\/06\/15\/ce-que-vous-pouvez-faire-contre-la-corrosion-localisee\/'>corrosion localis\u00e9e<\/a> qui affecte l'aluminium, le fer, l'acier et d'autres mat\u00e9riaux m\u00e9talliques. Elle se caract\u00e9rise par les cavit\u00e9s couvertes de rouille, ou piq\u00fbres, qu'elle laisse \u00e0 la surface du mat\u00e9riau. Si elle n'est pas combattue, la corrosion par piq\u00fbres peut endommager de fa\u00e7on permanente le mat\u00e9riau et amincir le m\u00e9tal, ce qui entra\u00eene une perte d\u00e9vastatrice de l'int\u00e9grit\u00e9 structurelle.<\/p>\n<h2>Quelles sont les causes de la corrosion par piq\u00fbres ?<\/h2>\n<p>Le plus souvent, la corrosion par piq\u00fbres se produit en raison de la d\u00e9passivation d'une petite zone. Cette petite zone devient anodique, tandis que la zone environnante devient cathodique. Il en r\u00e9sulte une corrosion localis\u00e9e.<\/p>\n<p>Mais qu'est-ce qui provoque la d\u00e9passivation en premier lieu ? Les petits d\u00e9fauts, comme les fissures, les \u00e9clats et les rayures ! Les petites \u00e9raflures \u00e0 la surface du m\u00e9tal peuvent sembler peu dangereuses, mais ces minuscules abrasions peuvent endommager le rev\u00eatement protecteur du m\u00e9tal et annuler sa passivit\u00e9. Les causes les plus courantes de la corrosion par piq\u00fbres sont les suivantes :<\/p>\n<ul>\n<li>Fissures<\/li>\n<li>Rayures<\/li>\n<li>Chips<\/li>\n<li>Contrainte non uniforme<\/li>\n<li>Substrat m\u00e9tallique d\u00e9fectueux<\/li>\n<li>Exposition \u00e0 des fluides turbulents<\/li>\n<li>Rev\u00eatement protecteur non uniforme<\/li>\n<li>Attaques chimiques<\/li>\n<\/ul>\n<p>Par cons\u00e9quent, si votre m\u00e9tal est endommag\u00e9 de quelque mani\u00e8re que ce soit ou expos\u00e9 \u00e0 des eaux agit\u00e9es, surveillez de pr\u00e8s l'apparition de piq\u00fbres. Une autre cause potentielle de piq\u00fbres est l'a\u00e9ration diff\u00e9rentielle. Lorsqu'un m\u00e9tal mal entretenu est expos\u00e9 \u00e0 l'eau ou \u00e0 des particules de poussi\u00e8re, une petite zone se d\u00e9soxyg\u00e8ne. Cela entra\u00eene une diff\u00e9rence d'a\u00e9ration entre cette zone et la zone environnante. Une r\u00e9action se produit et des piq\u00fbres de rouille se forment \u00e0 la surface du m\u00e9tal.<\/p>\n<h2>Comment reconna\u00eetre la corrosion par piq\u00fbres<\/h2>\n<p>Beaucoup consid\u00e8rent la corrosion par piq\u00fbres comme l'une des formes de corrosion les plus dangereuses, car elle est difficile \u00e0 pr\u00e9voir, \u00e0 d\u00e9tecter et \u00e0 pr\u00e9venir. Vous pouvez vous dire : \"Attendez, puisqu'elle cr\u00e9e des piq\u00fbres sur la surface du m\u00e9tal, ne devrait-elle pas \u00eatre facile \u00e0 d\u00e9tecter ?\" Malheureusement, les piq\u00fbres qu'elle cr\u00e9e sont incroyablement petites. La plupart sont invisibles (ou presque) \u00e0 l'\u0153il nu. En outre, elles sont g\u00e9n\u00e9ralement recouvertes d'une couche de corrosion, ce qui les rend encore plus difficiles \u00e0 rep\u00e9rer.<\/p>\n<p>Bien qu'il soit pratiquement impossible de rep\u00e9rer la corrosion par piq\u00fbres \u00e0 l'\u0153il nu, il est possible d'obtenir des informations sur la corrosion par piq\u00fbres \u00e0 l'\u0153il nu.\u00a0<em>sont<\/em>\u00a0des m\u00e9thodes fiables pour la d\u00e9tecter. Les tests peuvent emp\u00eacher la corrosion par piq\u00fbres de faire des ravages, c'est pourquoi nous recommandons de tester souvent les mat\u00e9riaux sensibles. Les m\u00e9thodes d'essai les plus courantes pour la corrosion par piq\u00fbres sont les suivantes :<\/p>\n<h3>Examen visuel<\/h3>\n<p>\u00c0 l'aide d'un microscope, le professionnel compte le nombre de piq\u00fbres dans une zone donn\u00e9e. Cela lui permet de d\u00e9terminer leur taille et leur r\u00e9partition ainsi que leur intensit\u00e9.<\/p>\n<h3>Test sonique<\/h3>\n<p>Lors d'un contr\u00f4le sonique, l'\u00e9nergie sonore des ultrasons est transmise au m\u00e9tal par l'interm\u00e9diaire d'un coupleur. Ces impulsions ultrasoniques rebondissent sur le m\u00e9tal et sont converties en signaux \u00e9lectriques. Ces signaux indiquent l'emplacement des piq\u00fbres et autres imperfections du m\u00e9tal.<\/p>\n<h3>Essais \u00e9lectromagn\u00e9tiques<\/h3>\n<p>Cette m\u00e9thode d'essai est utilis\u00e9e pour localiser les irr\u00e9gularit\u00e9s \u00e0 la surface des m\u00e9taux conducteurs tels que l'acier et le fer.<\/p>\n<h3>Essais \u00e9lectrochimiques<\/h3>\n<p>Les essais \u00e9lectrochimiques sont une autre fa\u00e7on de tester la vitesse de corrosion des m\u00e9taux. Pendant le test, un courant \u00e9lectrique est appliqu\u00e9 \u00e0 l'\u00e9lectrode de travail du m\u00e9tal pour cr\u00e9er des signaux mesurables.<\/p>\n<h3>Test d'immersion<\/h3>\n<p>Un morceau de m\u00e9tal est immerg\u00e9 dans une solution. On le laisse reposer pendant quelques jours. Apr\u00e8s le retrait, la vitesse de corrosion est mesur\u00e9e et les piq\u00fbres sont examin\u00e9es au microscope pour en d\u00e9terminer l'\u00e9tendue et l'intensit\u00e9.<\/p>\n<h2>Quels sont les mat\u00e9riaux les plus expos\u00e9s ?<\/h2>\n<p>Les mat\u00e9riaux contenant des ions bromure, chlorure ou hypochlorite sont les plus sensibles \u00e0 la corrosion par piq\u00fbres. Les mat\u00e9riaux expos\u00e9s \u00e0 des solutions contenant des fluorures ou des iodites (comme l'eau ou les sulfures) pr\u00e9sentent \u00e9galement un risque accru. Les m\u00e9taux suivants sont sujets \u00e0 la corrosion par piq\u00fbres<\/p>\n<ul>\n<li>Chrome<\/li>\n<li>Acier inoxydable<\/li>\n<li>Mercure<\/li>\n<li>Cobalt<\/li>\n<li>Aluminium<\/li>\n<li>Cuivre<\/li>\n<\/ul>\n<h2>Pr\u00e9vention de la corrosion par crevasses<\/h2>\n<p>Outre le fait de savoir comment identifier et \u00e9liminer les piq\u00fbres de corrosion, il est probable que vous souhaitiez savoir comment les pr\u00e9venir. Il existe quelques moyens de minimiser le risque de corrosion par piq\u00fbres.<\/p>\n<p>L'utilisation de mat\u00e9riaux r\u00e9sistants \u00e0 la corrosion est l'une des premi\u00e8res mesures pr\u00e9ventives \u00e0 prendre. Les alliages contenant du titane, de l'azote, du chrome et du molybd\u00e8ne r\u00e9sistent bien aux piq\u00fbres. Une autre m\u00e9thode de pr\u00e9vention efficace consiste \u00e0 <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/domaines-de-consultation\/corrosion\/etudes-de-potentiel-de-protection-cathodique\/interference-de-la-protection-cathodique\/'>la protection cathodique,<\/a> qui emp\u00eache la corrosion en transformant une surface m\u00e9tallique en cellule \u00e9lectrochimique. L'id\u00e9al est de recouvrir le mat\u00e9riau d'un m\u00e9tal plus r\u00e9actif. Ce m\u00e9tal corrosif agira comme une anode et se corrodera \u00e0 la place du m\u00e9tal d'origine, emp\u00eachant ainsi la formation de piq\u00fbres.<\/p>\n<p>L'un des moyens les plus efficaces de pr\u00e9venir la corrosion par piq\u00fbres consiste \u00e0 contr\u00f4ler au mieux les facteurs environnementaux (humidit\u00e9, temp\u00e9rature, chlorure, pH, acides et niveaux de sel). Parmi les autres m\u00e9thodes de pr\u00e9vention de la corrosion par piq\u00fbres, citons l'utilisation et l'entretien d'un rev\u00eatement protecteur et le contr\u00f4le de l'exposition aux fluides et \u00e0 la poussi\u00e8re.<\/p>\n<h2>Peut-on \u00e9liminer la corrosion par piq\u00fbres ?<\/h2>\n<p>Vous serez peut-\u00eatre heureux d'apprendre que, contrairement \u00e0 la plupart des formes de corrosion, la corrosion par piq\u00fbres peut \u00eatre \u00e9limin\u00e9e. Si le m\u00e9tal est encore structurellement sain, vous pouvez \u00e9liminer la corrosion \u00e0 l'aide d'un acide doux. Si vous souhaitez \u00e9liminer les piq\u00fbres, vous devrez poncer, gratter ou sabler le m\u00e9tal. Vous pouvez \u00e9galement \u00e9liminer les piq\u00fbres m\u00e9caniquement.<\/p>\n<p>Une fois la corrosion et les piq\u00fbres \u00e9limin\u00e9es, il convient d'appr\u00eater le m\u00e9tal \u00e0 l'aide de l'une des m\u00e9thodes de rev\u00eatement suivantes :<\/p>\n<ul>\n<li>Amor\u00e7age au phosphate de zinc<\/li>\n<li>M\u00e9tallisation par pulv\u00e9risation de zinc<\/li>\n<li>Rev\u00eatement chimique<\/li>\n<li>Trempage \u00e0 chaud<\/li>\n<\/ul>\n<p>Vous cherchez des moyens de lutter contre la corrosion par piq\u00fbres ? Les experts de Dreiym Engineering peuvent vous aider ! Nous proposons\u00a0<a href=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/services\/corrosion\/analyse-de-la-corrosivite-du-sol\/\"><strong>essais de corrosivit\u00e9 du sol<\/strong><\/a>\u00a0pour mesurer la corrosivit\u00e9 du sol dans lequel vos composants m\u00e9talliques sont enterr\u00e9s. Nous pouvons \u00e9galement <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/domaines-de-consultation\/corrosion\/conception-de-la-protection-cathodique\/'>concevoir et installer une protection cathodique<\/a> afin de r\u00e9duire davantage le risque de piq\u00fbres. Contactez-nous d\u00e8s aujourd'hui pour en savoir plus sur nos services de pr\u00e9vention de la corrosion ou pour prendre rendez-vous.<\/p>\n<img decoding=\"async\" class=\"aligncenter wp-image-3938 size-full\" src=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Remove-Pitting-Corrosion.jpg\" alt=\"Comment identifier et \u00e9liminer la corrosion par piq\u00fbres\" width=\"800\" height=\"2000\" srcset=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Remove-Pitting-Corrosion.jpg 800w, https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Remove-Pitting-Corrosion-120x300.jpg 120w, https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Remove-Pitting-Corrosion-768x1920.jpg 768w, https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2022\/02\/Remove-Pitting-Corrosion-614x1536.jpg 614w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>","protected":false},"excerpt":{"rendered":"<p>Corrosion is the enemy of metals of all kinds. This damaging process causes metal materials to gradually rust and degrade; and often, it attacks sneakily, undetectable until the damage is already done. What makes corrosion even harder to detect and prevent is that it comes in many forms. One of these is pitting corrosion, regarded [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":3453,"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":602,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-3053","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=\"Corrosion is the enemy of metals of all kinds. 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