{"id":5389,"date":"2019-10-30T04:54:24","date_gmt":"2019-10-30T04:54:24","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=5389"},"modified":"2022-06-30T09:03:22","modified_gmt":"2022-06-30T09:03:22","slug":"temperature-critique-de-corrosion-par-piqures-et-temperature-critique-de-corrosion-par-crevasses","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/fr\/blog\/temperature-critique-de-corrosion-par-piqures-et-temperature-critique-de-corrosion-par-crevasses\/","title":{"rendered":"R\u00e9glage de la temp\u00e9rature critique de corrosion par piq\u00fbres et de la temp\u00e9rature critique de corrosion caverneuse"},"content":{"rendered":"<h2>Qu&#039;est-ce que la temp\u00e9rature critique de corrosion par piq\u00fbres et la temp\u00e9rature critique de corrosion caverneuse<\/h2>\n<p>La temp\u00e9rature critique de piq\u00fbre (CPT) fait r\u00e9f\u00e9rence \u00e0 l&#039;enthalpie de temp\u00e9rature la plus basse au d\u00e9but et au d\u00e9veloppement de piq\u00fbres en r\u00e9gime permanent \u00e0 la surface d&#039;un \u00e9chantillon dans des conditions d&#039;essai sp\u00e9cifiques.<\/p>\n<figure id=\"attachment_5392\" aria-describedby=\"caption-attachment-5392\" style=\"width: 495px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2019\/10\/Critical-Corrosion.jpg\" target=\"_blank\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-5392\" src=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2019\/10\/Critical-Corrosion.jpg\" alt=\"Corrosion critique\" width=\"495\" height=\"328\" srcset=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2019\/10\/Critical-Corrosion.jpg 495w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2019\/10\/Critical-Corrosion-300x199.jpg 300w\" sizes=\"(max-width: 495px) 100vw, 495px\" \/><\/a><figcaption id=\"caption-attachment-5392\" class=\"wp-caption-text\">Corrosion critique<\/figcaption><\/figure>\n<p>La temp\u00e9rature critique de piq\u00fbre est utilis\u00e9e pour \u00e9valuer la sensibilit\u00e9 \u00e0 la piq\u00fbre des mat\u00e9riaux, qui fait r\u00e9f\u00e9rence \u00e0 l&#039;enthalpie de temp\u00e9rature la plus basse de la piq\u00fbre en r\u00e9gime permanent des mat\u00e9riaux.<\/p>\n<p>Selon les r\u00e9sultats des recherches de Qvarfbrt, la temp\u00e9rature critique de piq\u00fbre appara\u00eet comme une temp\u00e9rature de point d'inflexion soudaine sur la courbe du potentiel de rupture en fonction de la temp\u00e9rature. Lorsque la temp\u00e9rature est inf\u00e9rieure \u00e0 la temp\u00e9rature critique de piq\u00fbre, la surface du mat\u00e9riau ne subit pas de piq\u00fbre en r\u00e9gime permanent, ce qui est caract\u00e9ris\u00e9 par une surpassivation. Corrosion, le potentiel de rupture est caus\u00e9 par une corrosion excessive.<\/p>\n<p>Lorsque la temp\u00e9rature est sup\u00e9rieure \u00e0 la temp\u00e9rature de piq\u00fbre critique, le potentiel de claquage chute rapidement de plusieurs centaines de millivolts par rapport \u00e0 l&#039;\u00e9tat de passivation, ce qui entra\u00eene des piq\u00fbres en r\u00e9gime permanent. Puisqu&#039;il existe de nombreuses piq\u00fbres m\u00e9tastables en dessous de la temp\u00e9rature de piq\u00fbre critique, ces piq\u00fbres m\u00e9tastables ne deviennent pas un \u00e9tat stable, quelle que soit la puissance du potentiel appliqu\u00e9.<\/p>\n<p>Cela indique que la temp\u00e9rature de piq\u00fbre critique est la temp\u00e9rature critique \u00e0 laquelle la piq\u00fbre m\u00e9tastable se transforme en piq\u00fbre en r\u00e9gime permanent.<\/p>\n<p>La surface m\u00e9tallique forme un espace en raison de la pr\u00e9sence de corps \u00e9trangers ou de raisons structurelles, ce qui acc\u00e9l\u00e8re la corrosion du m\u00e9tal dans la fente, appel\u00e9e corrosion caverneuse critique. La corrosion caverneuse critique est une forme courante de corrosion localis\u00e9e qui se produit g\u00e9n\u00e9ralement dans l&#039;espace entre le m\u00e9tal et le m\u00e9tal ou entre le m\u00e9tal et le non-m\u00e9tal, g\u00e9n\u00e9ralement comme les joints, les joints \u00e0 bride, les joints boulonn\u00e9s et les boues d\u00e9pos\u00e9es. Il est recouvert de m\u00e9tal et de plaques de m\u00e9tal.<\/p>\n<p>La corrosion caverneuse critique, comme la corrosion par piq\u00fbres critiques, a une temp\u00e9rature critique appel\u00e9e CCT (temp\u00e9rature critique de corrosion caverneuse). Le CCT est tr\u00e8s utile pour juger de la sensibilit\u00e9 de la corrosion caverneuse et pr\u00e9venir la corrosion caverneuse critique. Les facteurs affectant le CCT sont plus complexes et sont \u00e9troitement li\u00e9s \u00e0 l&#039;environnement chimique de l&#039;eau dans l&#039;espace, aux conditions g\u00e9om\u00e9triques de l&#039;espace et \u00e0 la composition mat\u00e9rielle de l&#039;espace.<\/p>\n<h2>Quels sont les crit\u00e8res pour d\u00e9terminer la temp\u00e9rature critique de piq\u00fbre ou la temp\u00e9rature critique de corrosion caverneuse ?<\/h2>\n<ul>\n<li>GB\/T 32550-2016 D\u00e9termination de la temp\u00e9rature critique de piq\u00fbre sous contr\u00f4le du potentiel constant de corrosion des m\u00e9taux et alliages<\/li>\n<li>ISO 17864-2005 D\u00e9termination de la temp\u00e9rature de piq\u00fbre critique sous contr\u00f4le de position \u00e9lectrostatique corrosif des m\u00e9taux et alliages<\/li>\n<li>ISO 18089-2015 D\u00e9termination de la temp\u00e9rature de corrosion caverneuse de l&#039;acier inoxydable sous corrosion et contr\u00f4le du potentiel constant des m\u00e9taux et alliages<\/li>\n<li>M\u00e9thode d&#039;essai ASTM G48-11 pour la d\u00e9termination de la corrosion par piq\u00fbres et de la corrosion interstitielle de l&#039;acier inoxydable et des alliages connexes \u00e0 l&#039;aide d&#039;une solution de chlorure ferrique<\/li>\n<li>M\u00e9thode d&#039;essai standard pour l&#039;essai de corrosion par piq\u00fbres critiques \u00e9lectrochimiques en acier inoxydable ASTM G150-99<\/li>\n<\/ul>\n<hr \/>\n<h2>R\u00e9sum\u00e9 des points de test de la temp\u00e9rature critique de piq\u00fbre ou de la temp\u00e9rature critique de corrosion caverneuse<\/h2>\n<h3>GB\/T 32550-2016 D\u00e9termination de la temp\u00e9rature critique de piq\u00fbre sous contr\u00f4le du potentiel constant de corrosion des m\u00e9taux et alliages<\/h3>\n<p><strong>Champ d&#039;application:<\/strong><\/p>\n<p>La pr\u00e9sente norme sp\u00e9cifie la m\u00e9thode, la proc\u00e9dure et les exigences pour la d\u00e9termination rapide de la temp\u00e9rature critique de piq\u00fbre de l&#039;acier inoxydable avec un seul \u00e9chantillon.<\/p>\n<p>La pr\u00e9sente norme s&#039;applique \u00e0 la d\u00e9termination de la temp\u00e9rature critique de piq\u00fbre de l&#039;acier inoxydable sous contr\u00f4le de potentiel constant (aust\u00e9nite, ferrite\/aust\u00e9nite). , ferrite).<\/p>\n<p>*Remarque : La temp\u00e9rature de piq\u00fbre critique d\u00e9finie dans cette norme peut \u00eatre utilis\u00e9e comme indicateur relatif de performance. Par exemple, pour comparer les performances relatives de diff\u00e9rentes nuances d&#039;acier inoxydable, l&#039;essai de cette norme n&#039;est pas destin\u00e9 \u00e0 d\u00e9terminer la temp\u00e9rature \u00e0 laquelle la piq\u00fbre se produit dans l&#039;environnement de service.<\/p>\n<p>Principe du test :<\/p>\n<ul>\n<li>1) Exposition de l&#039;\u00e9chantillon \u00e0 un environnement de test sp\u00e9cifique et maintien du potentiel de l&#039;\u00e9chantillon \u00e0 une valeur sp\u00e9cifi\u00e9e, augmentation de la temp\u00e9rature de surface de l&#039;\u00e9chantillon \u00e0 une vitesse sp\u00e9cifique en chauffant la solution.<\/li>\n<li>2) La temp\u00e9rature de piq\u00fbre critique est d\u00e9finie comme la temp\u00e9rature correspondante de l&#039;\u00e9chantillon lorsque la densit\u00e9 d&#039;\u00e9lectrode de l&#039;\u00e9chantillon d\u00e9passe la valeur sp\u00e9cifi\u00e9e de 60 secondes. Le retard de 60 s permet de s&#039;assurer que l&#039;augmentation observ\u00e9e du courant provient de l&#039;initiation et du d\u00e9veloppement de piq\u00fbres en r\u00e9gime permanent, au lieu de pics de courant \u00e0 court terme caus\u00e9s par des piq\u00fbres m\u00e9tastables.<\/li>\n<li>3) Le porte-\u00e9chantillon est con\u00e7u pour garantir que la corrosion caverneuse ne se produise pas au niveau du joint entre l&#039;\u00e9chantillon et le porte-\u00e9chantillon.<\/li>\n<li>4) Il y aura un gradient de temp\u00e9rature entre la solution en vrac et l&#039;\u00e9chantillon, dont l&#039;amplitude d\u00e9pend de la forme et de la taille de l&#039;\u00e9chantillon.<\/li>\n<li>5) La vitesse de chauffage, l&#039;environnement d&#039;essai et le potentiel donn\u00e9 varient selon les mat\u00e9riaux. Se r\u00e9f\u00e9rer \u00e0 l&#039;annexe A pour un guide de s\u00e9lection pour l&#039;acier inoxydable aust\u00e9nitique et d&#039;autres param\u00e8tres d&#039;essai d&#039;acier inoxydable.<\/li>\n<li>6) La temp\u00e9rature critique de piq\u00fbre d\u00e9finie par cette m\u00e9thode d&#039;essai n&#039;est utilis\u00e9e que comme indice de comparaison relatif des performances.<\/li>\n<\/ul>\n<p><strong>Testez la d\u00e9coration :<\/strong><\/p>\n<p>Potentiostat, instrument de mesure de potentiel d&#039;\u00e9lectrode, instrument de mesure \u00e9lectrique, porte-\u00e9chantillon \u00e0 temp\u00e9rature contr\u00f4l\u00e9e, cellule \u00e9lectrolytique, \u00e9lectrode auxiliaire, \u00e9lectrode de r\u00e9f\u00e9rence.<\/p>\n<p>Exigences relatives aux sp\u00e9cimens : Tout sp\u00e9cimen adapt\u00e9 au porte-\u00e9chantillon peut \u00eatre utilis\u00e9. L&#039;\u00e9tat de surface de l&#039;\u00e9chantillon avec la zone de travail minimale doit \u00eatre reproductible.<br \/>\n\u00c9valuation des r\u00e9sultats d&#039;essai : observation de la surface de l&#039;\u00e9chantillon apr\u00e8s l&#039;essai, temp\u00e9rature critique de piq\u00fbre (CPT), formule de conversion entre la solution d&#039;essai et la temp\u00e9rature de l&#039;\u00e9chantillon<\/p>\n<h3>M\u00e9thode d&#039;essai ASTM G4S-11 pour la d\u00e9termination de la corrosion par piq\u00fbres et de la corrosion interstitielle de l&#039;acier inoxydable et des alliages associ\u00e9s \u00e0 l&#039;aide d&#039;une solution de chlorure ferrique<\/h3>\n<p><strong>M\u00e9thode d&#039;essai:<\/strong><\/p>\n<ol>\n<li>Test A (test de corrosion par piq\u00fbres au chlorure ferrique)<\/li>\n<li>Test B (test de corrosion au chlorure ferrique)<\/li>\n<li>Test C (test de temp\u00e9rature critique de piq\u00fbre des alliages \u00e0 base de nickel et de chrome pour roulements)<\/li>\n<li>Test D (test critique de temp\u00e9rature de corrosion caverneuse d&#039;un alliage \u00e0 base de nickel contenant du niobium pour roulements)<\/li>\n<li>Test E (test de temp\u00e9rature critique de piq\u00fbre de l&#039;acier inoxydable)<\/li>\n<li>Test F (test de temp\u00e9rature critique de corrosion caverneuse en acier inoxydable)<\/li>\n<\/ol>\n<p><strong>Instruments d&#039;essai\u00a0:<\/strong><\/p>\n<ul>\n<li>Flacon \u00e0 col large, tube \u00e0 essai, condenseur, trou traversant et couvercle, porte-\u00e9chantillon, bain-marie ou bain d&#039;huile \u00e0 temp\u00e9rature constante, gabarit de fissure<\/li>\n<li>Temp\u00e9rature d&#039;essai : la temp\u00e9rature d&#039;essai recommand\u00e9e pour le test A ^ B est de 22 \u00b0C \u00b1 2 \u00b0C ou de 50 \u00b0C \u00b1 2 \u00b0C<\/li>\n<li>Les bains d&#039;essai C, D, E, F doivent \u00eatre capables de fournir une temp\u00e9rature constante comprise entre 0 \u00b0C et 85 \u00b0C \u00b1 1 \u00b0C<\/li>\n<\/ul>\n<p><strong>Tester la solution\u00a0:<\/strong> Pour les m\u00e9thodes C, D, E et F, 68,72 g de FeCl3 de qualit\u00e9 r\u00e9actif. 6H20 a \u00e9t\u00e9 dissous dans 600 ml d&#039;eau de qualit\u00e9 r\u00e9actif, et 16 ml d&#039;acide chlorhydrique concentr\u00e9 de qualit\u00e9 r\u00e9actif ont \u00e9t\u00e9 ajout\u00e9s pour former une solution ayant une fraction massique d&#039;environ 6% FeCl3 et 1% HCl.<\/p>\n<p><strong>Taille de l&#039;\u00e9chantillon:<\/strong> recommand\u00e9 25*50* (2~6) mm, r\u00e9glable<\/p>\n<p><strong>Nombre d&#039;\u00e9chantillons:<\/strong> 5-6 \u00e9chantillons, de plus en plus bons<\/p>\n<p><strong>Temps de test:<\/strong> 24 heures pour un seul \u00e9chantillon<\/p>\n<hr \/>\n<p>Post\u00e9 par\u00a0<a href=\"https:\/\/www.kaysuns.com\/fr\/tubes-en-acier-inoxydable\/\" target=\"_blank\">fournisseur de tubes en acier inoxydable<\/a>\u00a0et\u00a0<a href=\"https:\/\/www.kaysuns.com\/fr\/tuyaux-en-acier-inoxydable\/\" target=\"_blank\">fournisseur de tuyaux en acier inoxydable<\/a>\u00a0KAYSUNS.<\/p>","protected":false},"featured_media":5392,"template":"","categories":[186],"tags":[],"class_list":["post-5389","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>Critical Pitting Corrosion Temperature And Critical Crevice Corrosion Temperature Setting - Stainless Steel Pipe and Fittings | KAYSUNS<\/title>\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\/temperature-critique-de-corrosion-par-piqures-et-temperature-critique-de-corrosion-par-crevasses\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Critical Pitting Corrosion Temperature And Critical Crevice Corrosion Temperature Setting - Stainless Steel Pipe and Fittings | KAYSUNS\" \/>\n<meta property=\"og:description\" content=\"What is Critical Pitting Corrosion Temperature And Critical Crevice Corrosion Temperature Critical pitting temperature (CPT) refers to the lowest temperature enthalpy at the initiation and development of steady-state pitting on the surface of a sample under specific test conditions. 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