Surface passivation ntawm carbon steel kav

Surface passivation ntawm carbon steel kav

(1) Lub hom phiaj ntawm kev siv cov qauv no rau qhov kub thiab txias qhov chaw passivation yog ua kom huv ntawm cov yeeb nkab phab ntsa thiab tsim kom muaj xim xiav Fe3O4 oxide passivation txheej, uas yog ib qho kev tiv thaiv zoo heev. Txoj kev tshwj xeeb yog kom sov cov pa roj carbon steel yeeb nkab mus rau 500-600 degree, thiab tom qab ntawd yaug nws nrog dej vapor rau saum npoo passivation. Nyob rau lub sijhawm no, qhov tsis zoo thiab niaj hnub FE3O4 oxide txheej yuav tsim nyob rau sab hauv ntawm cov pa roj carbon hlau.

(2) Cov txheej txheem tshuaj lom neeg kuj ua rau Fe3O4 oxide zaj duab xis passivation txheej ntawm cov yeeb nkab phab ntsa, tab sis qhov sib txawv yog siv cov tshuaj oxidizing reagents. Tam sim no, lub ntsiab reagent siv rau passivation tov yog poov tshuaj dichromate. Txoj kev tshwj xeeb yog muab cov kua qaub ntxuav thiab ua kom huv cov pa roj carbon steel yeeb nkab rau hauv lub tank passivation, tsau nws ntawm qhov kub thiab txias rau qee lub sijhawm, thiab tsim kom muaj Fe3O4 oxide zaj duab xis ntom ntom hauv cov yeeb nkab phab ntsa.

1.2.2 Ntxiv corrosion inhibitors rau cov dej ua haujlwm

Ntxiv cov tshuaj tiv thaiv corrosion rau cov dej ua haujlwm yog tsim kom muaj kev sib txuam ntau dua thiab ntom Fe3O4 passivation txheej ntawm cov yeeb nkab phab ntsa. Corrosion inhibitors thiab chemical passivation feem ntau yog siv ua ke. Vim tias qhov kev puas tsuaj uas tsis tuaj yeem ua rau lub zos passivation zaj duab xis thaum lub sij hawm tsim khoom, corrosion inhibitors tuaj yeem ua lub luag haujlwm kho. Muaj ntau ntau hom corrosion inhibitors, thiab anode hom corrosion inhibitors feem ntau yog siv, uas muaj kev cuam tshuam zoo corrosion inhibition ntawm cov yeeb nkab phab ntsa. Txoj kev tshwj xeeb yog ntxiv cov poov tshuaj dichromate nrog ib feem ntawm 1% mus rau 3% rau cov kua dej ua haujlwm.

1.2.3 Emission thiab permeation txoj kev

Nruab ib lub qhov tso pa tawm ntawm qhov kawg ntawm cov yeeb nkab cua sov, thiab yog tias tsim nyog, qhib lub valve kom tso tawm cov pa roj hydrogen. Palladium tubes tseem tuaj yeem ntsia tau rau ntawm qhov kawg ntawm qhov kawg ntawm cov yeeb nkab cua sov kom tso cai rau cov roj hydrogen tsim tawm kom nkag mus rau txhua lub sijhawm.

1.2.4 Oxidative dehydrogenation method

Raws li kev tshawb xav tshuaj, oxides ntawm cov ntsiab lus nrog tus qauv zoo electrode muaj peev xwm raug txo los ntawm hydrogen. Cov oxides ntawm cov ntsiab lus xws li tooj liab, npib tsib xee, zinc, cobalt, thiab lwm yam tuaj yeem ua rau cov tshuaj tiv thaiv redox nrog hydrogen, tab sis qhov xav tau qhov kub thiab txias thiab cov tshuaj tiv thaiv sib txawv. Lub tshuab oxidation dehydrogenation tau pib txhawb thiab siv thaum xyoo 1990s, tab sis qhov xav tau cov tshuaj tiv thaiv kub feem ntau tshaj 150 degree, uas txwv nws cov ntawv thov kev lag luam. Tam sim no, tus qauv tshiab thiab muaj txiaj ntsig zoo rau oxidation dehydrogenation thev naus laus zis tau ua tiav thiab siv hauv kev lag luam, uas tuaj yeem nqa tawm cov tshuaj dehydrogenation sai sai ntawm chav tsev kub. Kev nce qib thiab kev siv cov thev naus laus zis no yuav txhim kho lub neej kev pab cuam ntawm cov kav dej kub. Peb ntseeg hais tias txoj hauv kev zoo tshaj plaws los ua kom lub neej ntev ntawm cov kav dej kub yog los ntawm kev sib xyaw ntawm cov tshuaj passivation, corrosion inhibitors, thiab oxidation thiab hydrogen tshem tawm cov thev naus laus zis, teb rau qhov tsis ruaj khov ntawm cov yeeb yaj kiab chemical passivation, qhov nyuaj hauv kev khiav hauj lwm emission thiab permeation txoj kev, thiab xav tau cov khoom siv thiab kev nqis peev hauv high-temperature steam passivation.

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