Tom qab cov hlau raug kho los ntawm oxidizing nruab nrab, qhov corrosion ntawm cov hlau yog qis dua li ntawm cov khoom qub uas tsis tau kho, uas yog hu ua passivation ntawm cov hlau.
Feem ntau hais lus, passivation ua tau hloov cov hlau ntog mus rau hauv qhov chaw inert los ntawm cov tshuaj tiv thaiv ntawm cov tshuaj passivation, thiaj li tiv thaiv cov khoom puas sab nraud los ntawm reacting nrog cov hlau nto thiab ua tiav lub hom phiaj ntawm lub sij hawm ntev hlau rusting. (Yog vim li cas cov khoom yog yooj yim rau xeb ua ntej passivation, tab sis tsis yog tom qab passivation. Piv txwv li, hlau yuav sai sai yaj nyob rau hauv dilute nitric acid, tab sis lub phenomenon ntawm dissolving nyob rau hauv concentrated nitric acid yuav luag kiag li nres; Aluminium yog tsis ruaj tsis khov nyob rau hauv dilute nitric acid, tab sis cov thawv ntim txhuas tuaj yeem siv los khaws cov concentrated nitric acid Cov phenomena passivation no hu ua chemical passivation.
Txoj cai ntawm passivation
Lub hauv paus ntsiab lus ntawm passivation tuaj yeem piav qhia los ntawm txoj kev xav ntawm zaj duab xis nyias, uas yog, nws tau txiav txim siab tias passivation yog vim muaj kev cuam tshuam ntawm cov hlau thiab oxidizing nruab nrab, uas yuav ua rau nyias nyias (li 1nm), ntom, zoo-them passivation zaj duab xis. nyob rau saum npoo hlau, uas tuaj yeem ruaj khov rau ntawm qhov chaw hlau. Cov yeeb yaj kiab no tshwm sim raws li theem kev ywj pheej, feem ntau yog qhov sib xyaw ntawm oxygen thiab hlau.
Nws tuaj yeem cais cov hlau los ntawm qhov nruab nrab corrosive, thiab tiv thaiv cov hlau los ntawm kev sib cuag ncaj qha nrog corrosive nruab nrab, thiaj li hais tias cov hlau yeej tsis tawg thiab ua rau lub xeev passive kom ua tiav lub hom phiaj ntawm kev tiv thaiv corrosion thiab xeb.
Cov yam ntxwv thiab qhov zoo ntawm passivation:
Stainless hlau passivation tov tsis hloov qhov loj, xim thiab tsos ntawm screws; Tsis muaj cov yeeb yaj kiab roj txuas, thiab qhov kev tiv thaiv corrosion yog qhov zoo dua thiab ruaj khov (kev kho passivation yog qhov kev xaiv zoo tshaj plaws los hloov cov tshuaj tiv thaiv corrosion rau cov roj los tiv thaiv xeb). Tsis tas yuav tsum muaj cov cuab yeej tshwj xeeb thiab kev ua haujlwm nruj, tsuas yog ob peb lub thawv yas lossis lub tank stainless hlau yuav tsum tau, thiab tus nqi qis (2/3 tsawg dua li ntawm kev ua haujlwm tawm); Kev ua haujlwm yog yooj yim, uas ua tau raws li cov kev xav tau ntawm kev lag luam, thiab ua kom txhua tus tuaj yeem ua tau, txhua tus tuaj yeem ua tau, thiab tuaj yeem ua tau txhua lub sijhawm. Tsuas yog raus cov screws hauv Senyuan hom stainless hlau passivation tov rau 30 feeb ntawm chav tsev kub.
Passivation:
Tom qab cov ntsia hlau yog passivated zaj duab xis nrog cov kev pab them rau saum npoo av, uas tuaj yeem ua rau cov ntsia hlau ntau dua 500 teev ntawm cov tshuaj tsuag ntsev.
Screw passivation txheej txheem:
Ua ntej degrease cov screws - yaug nrog dej ntws - qhib lawv - yaug lawv nrog dej ntws-passivate lawv (rau ntau tshaj 30 feeb) - yaug nrog dej ntws - yaug lawv nrog dej ultrapure-qhuav lawv thiab ntim lawv.
Post lub sij hawm: Nov-29-2022