Hydrogen corrosion tej zaum yuav tshwm sim hauv Ammonia synthesis, hydrogen desulfurization hydrogenation cov tshuaj thiab roj av ua kom zoo nkauj. Carbon steel tsis haum rau siv rau hauv kev kub siab hydrogen teeb tsa saum 232 ° C. Hydrogen tuaj yeem diffuse rau hauv cov hlau thiab hnov mob nrog hlau carbide ntawm cov ciaj ciam nplej lossis hauv cov hlaws cov zones los tsim cov methane. Muav tsuag methane (roj) tsis tuaj yeem cuam tshuam rau sab nraud ntawm cov hlau thiab sau, ua kom dawb me ntsis thiab cov khoom tawg lossis cov hlau.
Txhawm rau tiv thaiv kev tsim cov tshuaj methane, yuav tsum tau muab hloov los ntawm carbides ruaj khov, hlau yuav tsum tau muab ntxiv rau chromium, vanadium, titanium lossis tho. Nws tau sau tseg uas nce cov ntsiab lus Chromium cov ntaub ntawv tso cai siab dua thiab hydrogen ib feem ntawm cov hlau, thiab nws yog qhov ruaj khov rau hydrogen. Chromium cov hlau thiab Austenitic stainless hlau uas muaj ntau dua 12% yog corrosion tiv thaiv nyob rau txhua daim ntawv thov hauv txhua qhov kev pabcuam hnyav (kub siab dua 593 ° C).
Feem Ntau Cov HlauThiab alloys tsis hnov mob nrog molecular nitrogen ntawm high kub, tab sis atomic nitrogen tuaj yeem ua rau muaj ntau cov hlau. thiab nkag mus rau hauv cov hlau los ua ib txheej nitride txheej txheej npoo av. Hlau, Aluminium, Titanium, chromium thiab lwm cov khoom siv tau tuaj yeem cuam tshuam rau hauv cov kev cuam tshuam no. Lub hauv paus tseem ceeb ntawm atomic nitrogen yog qhov decomposition ntawm ammonia. Ammonia kev txiav txim siab tshwm sim hauv ammonia conventers, ammonia cov cua sov ntau lawm thiab nitriving rhuab ua haujlwm ntawm 371 ° C, ib qho chaw muaj cua ~ 10.5kg / mm².
Hauv cov cua txias no, chromium carbide tshwm nyob rau hauv chromium steel. Tej zaum nws yuav yog corroded los ntawm atomic nitrogen thiab tsim chromium nitride, thiab cov hydrogen los tsim cov methorane, uas yuav tau tsim cov pob dawb thiab tawg, lossis ib qho ntawm lawv. Txawm li cas los xij, nrog chromium cov ntsiab lus saum toj no 12%, cov carbides hauv cov steels no yog ruaj khov dua li, yog li cov hlwv dhau los siv nyob rau hauv qhov chaw kub kub nrog kub ammonia.
Lub xeev ntawm stainless hlau hauv Ammonia yog txiav txim siab los ntawm kub, siab, roj siab thiab cov ntsiab lus chromium-tsib xee. Kev sim teb qhia pom tias cov xeb xeb (qhov tob ntawm kev hloov kho cov hlau lossis qhov tob ntawm cov hlau tsis muaj zog lossis cov neeg tiv thaiv tsis muaj zog ntxiv, uas yog cov ntsiab lus ntau dua li npib tsib xee. Raws li cov ntsiab lus nce tus nqi corrosion nce.
Anustenitic Stainless hlau nyob rau hauv kub halogen vapor, corrosion yog heev loj, fluorine yog corrosive ntau dua chlorine. Rau siab ni-c r r r r stainless hlau, qhov txwv sab saud ntawm qhov ntsuas kub hauv cov roj qhuav rau 249 ℃, tshuaj chlorine rau 316 ℃.
Lub Sijhawm Post: Tsib Hlis-24-2024