tuyau sans soudure en acier inoxydable<\/a> d\u00e9capage et passivation<\/strong><\/p>\n(1) D\u00e9capage m\u00e9dicament de passivation HNO3 6% \uff5e 25% + HF 0.5% \uff5e 8% (fraction volumique)\uff1a<\/p>\n
temp\u00e9rature 21 \uff5e 60 \u2103; temps au besoin; ou m\u00e9dicament citrate d'ammonium 5% \uff5e 10% Masse molaire); temp\u00e9rature 49 \uff5e 71 ; temps 10min 60min.<\/p>\n
(2) M\u00e9dicament de traitement passif HNO3 20% 50% (fraction volumique)\u00a0:<\/p>\n
temp\u00e9rature 49 71 \u2103; temps 10min 30min; ou temp\u00e9rature 2l \uff5e 38 \u2103; temps 30min 60min; ou m\u00e9dicament HNO320% 50% + Na2Cr207H2O 22% 6% (masse molaire); temp\u00e9rature 49 \uff5e 54 ; temps 15min \uff5e 30min; ou temp\u00e9rature 21 \u2103 \uff5e 38 \u2103; temps 30min 60min.<\/p>\n
(3) D\u00e9tartrage et d\u00e9capage m\u00e9dicament de passivation H2SO4 8% 11% (fraction volumique)\u00a0:<\/p>\n
Temp\u00e9rature 66 \uff5e 82 \u2103; 6 pouces 5min 45min; HNO3 6% 25% + HF 0,5% \uff5e 8% (fraction volumique) ; temp\u00e9rature 21 \uff5e 60 \u2103; ou HNO3 15% 25% + HF l % \uff5e 8 (fraction volumique).<\/p>\n
Solution de pl\u00e2tre<\/strong><\/p>\n(1) HNO3 25% ~ + 4% HF + 71% condensat (fraction volumique) et BaSO4, ajuster \u00e0 \u00e9pais. P\u00e2te de passivation : 30% HNO3 ou 25% + 1% HNO3 (masse molaire) K2Cr2O7 et BaSO4 sont ajust\u00e9s pour \u00eatre \u00e9pais. Appliquer la couche de surface pendant 5 \u00e0 30 minutes, et la laver \u00e0 l'eau condens\u00e9e jusqu'\u00e0 pH = 7. Pour chaque machine et \u00e9quipement, un traitement de passivation chimique organique par pulv\u00e9risation de peroxyde d'hydrog\u00e8ne peut \u00e9galement \u00eatre utilis\u00e9.<\/p>\n
(2) P\u00e2te de passivation de d\u00e9capage : HNO3 8% 14% (comme agent de passivation) ; HF 10% 15% (comme agent corrosif); sulfate de magn\u00e9sium 2.2% 2.7% (comme \u00e9mulsifiant) nitrate de magn\u00e9sium 60% \uff5e 70% (comme charge pour am\u00e9liorer l'adh\u00e9rence et l'hydrophilie) ; polyphosphate de sodium 2.3% \u00e0 2.8% (comme inhibiteur de corrosion); eau (ajuster la viscosit\u00e9).<\/p>\n
M\u00e9thode \u00e9lectrochimique<\/strong><\/p>\nR\u00e9soudre le probl\u00e8me de l'anodisation du tuyau en acier inoxydable<\/a> pi\u00e8ces en attente d'examen, et manipuler le potentiel potentiostatique pour effectuer un traitement d'anodisation, ou utiliser d'abord des pi\u00e8ces en acier de tuyau sans soudure en acier inoxydable comme \u00e9lectrode n\u00e9gative, et manipuler la diff\u00e9rence potentiostatique pour effectuer un traitement cathodique.<\/p>\nEnsuite, l'acier du tube sans soudure en acier inoxydable a \u00e9t\u00e9 anodis\u00e9, et le potentiel potentiostatique a \u00e9t\u00e9 manipul\u00e9 pour effectuer un traitement d'anodisation, et la diff\u00e9rence potentiostatique a \u00e9t\u00e9 modifi\u00e9e \u00e0 nouveau pour effectuer la passivation de l'acier inoxydable. La solution d'\u00e9lectrolyte \u00e9tait HNO3.<\/p>\n
Apr\u00e8s cela, les propri\u00e9t\u00e9s de rev\u00eatement des tuyaux sans soudure en acier inoxydable sont am\u00e9lior\u00e9es et la r\u00e9sistance \u00e0 la corrosion est encore am\u00e9lior\u00e9e. La diff\u00e9rence de potentiel seuil de corrosion caverneuse (Eb) est augment\u00e9e d'environ 1000 mV (en 3% NaCl), et la r\u00e9sistance \u00e0 la corrosion uniforme peut \u00eatre am\u00e9lior\u00e9e de trois ordres de grandeur (en 20% -30% H2SO4 \u00e0 45\u00b0C).<\/p>","protected":false},"featured_media":5634,"template":"","categories":[186],"tags":[],"class_list":["post-5633","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-stainless-steel-knowledge"],"yoast_head":"\n
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