Dab tsi yog Corrosion Resistance Qhov Zoo ntawm Monel 400 Piv nrog 316 Stainless Hlau?
Monel 400 yog nickel-tooj liab-solution alloy, thaum 316 stainless hlau yog austenitic chromium-nickel-molybdenum stainless hlau. Ob qho tib si tau siv dav hauv kev siv tshuaj tiv thaiv corrosion, tab sis Monel 400 qhia qhov sib txawv thiab kev ua haujlwm zoo dua corrosion nyob rau hauv ntau qhov chaw tseem ceeb, tshwj xeeb tshaj yog cov uas cuam tshuam nrog kev txo cov acids, halides, seawater thiab high-temperature alkaline tej yam kev mob.
1. Corrosion Resistance nyob rau hauv Txo Acid Ib puag ncig
316 stainless hlau cia siab rau chromium los ua ib zaj duab xis oxide passive rau kev tiv thaiv corrosion. Cov txheej txheem passive no ruaj khov hauv oxidizing acids xws li dilute nitric acid, tab sis nyiam ua kom tawg sai sai hauv qhov chaw muaj zog, ua rau muaj kev cuam tshuam loj heev thiab pitting.
Monel 400 muaj kev ruaj ntseg zoo hauv kev tsis-oxidizing, txo cov kua qaub, tshwj xeeb tshaj yog hydrofluoric acid (HF) thiab sulfuric acid nyob rau hauv nruab nrab concentrations thiab kub. Cov nickel-tooj liab matrix muab kev tiv thaiv zoo heev rau hydrogen-induced corrosion thiab zam qhov tsis ua haujlwm sai uas cuam tshuam rau 316 SS. Hauv cov ntshiab, aerated txo cov kua qaub tsis muaj zog oxidizing cov neeg ua haujlwm, Monel 400 nthuav tawm cov nqi qis dua thiab ua haujlwm ntev dua li 316 stainless hlau.
2. Kev ua tau zoo tshaj plaws hauv Hydrofluoric Acid thiab Fluoride Media
Qhov no yog ib qho zoo tshaj plaws ntawm Monel 400 tshaj 316 stainless hlau.
316 stainless hlau yuav luag tsis muaj kev tiv thaiv zoo rau hydrofluoric acid. Cov tshuaj fluoride ions aggressively tawm tsam cov chromium-nplua nuj passive zaj duab xis, ua kom ceev ceev uniform corrosion thiab intergranular nres. Nws tsis haum rau HF-muaj cov tshuab ntawm txhua qhov kev ua tau zoo thiab qhov kub thiab txias.
Monel 400 yog ib qho ntawm ob peb txheej txheem engineering alloys dav siv rau hydrofluoric acid tuav. Nws tsim cov yeeb yaj kiab tiv thaiv ruaj khov hauv cov tshuaj tsis muaj dej thiab dej HF thiab tiv thaiv fluoride-ion induced corrosion. Nws yog ib txwm teev tseg rau li qub, twj tso kua mis, cov khoom siv hluav taws xob thiab cov kav dej hauv cov txheej txheem tshuaj muaj feem xyuam nrog hydrofluoric acid, qhov twg 316 SS tsis tsim nyog.
3. Kev tiv thaiv zoo dua rau dej hiav txwv thiab dej ntsev Corrosion
Ob lub alloys muaj cov dej hiav txwv zoo, tab sis Monel 400 tuav cov txiaj ntsig zoo hauv cov dej hiav txwv tiag tiag.
316 stainless hlau ua tau zoo nyob rau hauv zoo li qub, qis-ceev seawater tab sis muaj kev cuam tshuam heev rau crevice corrosion thiab pitting corrosion nyob rau hauv qhov chaw ruaj khov, nyob rau hauv deposits los yog nyob rau hauv high-chloride ib puag ncig. Nws feem ntau yuav tsum muaj kev tiv thaiv cathodic lossis kev saib xyuas tsis tu ncua txhawm rau txo qis hauv cheeb tsam corrosion.
Monel 400 muaj kev tiv thaiv zoo heev rau seawater corrosion, nrog rau kev tiv thaiv rau pitting, crevice corrosion thiab marine biofouling-txog corrosion. Nws tuav qis tus nqi corrosion nyob rau hauv ob qho tib si nyob twj ywm thiab ntws dej hiav txwv, thiab qhia tau hais tias zoo dua tiv thaiv chloride-induced localized nres tshaj 316 SS. Nws yog dav siv rau marine hardware, twj tso kua mis shafts, condenser raj thiab shipbuilding Cheebtsam, nrog ntau txhim khu kev qha mus ntev kev ua tau zoo.
4. Alkali thiab Caustic Corrosion Resistance
Monel 400 yog qhov zoo tshaj plaws rau 316 stainless hlau hauv cov ntsiab lus alkaline thiab caustic daws.
316 stainless hlau muaj qhov nruab nrab tsis kam rau dilute alkalis ntawm chav tsev kub, tab sis ua kom nrawm nrawm hauv kub, concentrated caustic soda (NaOH), potash (KOH) thiab lwm yam muaj zog alkaline xov xwm. Cov zaj duab xis passive tsis ruaj khov nyob rau hauv high-temperature caustic tej yam kev mob.
Monel 400 yog cov resistant rau ob qho tib si dilute thiab concentrated alkaline daws nyob rau hauv ib tug dav kub ntau yam. Nws yog dav siv nyob rau hauv caustic evaporators, bleach ntau lawm, xab npum manufacturing thiab lwm yam alkaline ua lag luam, qhov twg nws tswj zoo heev structural kev ncaj ncees nrog negligible corrosion nqi.
5. Kev tiv thaiv kom txo tau Halide thiab Acid Chloride Ib puag ncig
Nyob rau hauv ib puag ncig uas muaj chloride ions nyob rau hauv txo tej yam kev mob -xws li ntub hydrogen chloride gas, hydrochloric acid nyob rau hauv nruab nrab kub thiab concentrations, thiab chloride-muaj organic media-Monel 400 outperforms 316 stainless hlau.
316 SS yog qhov yooj yim rau pitting thiab crevice corrosion nyob rau hauv cov xwm txheej no, txawm tias nws ntxiv molybdenum. Monel 400's nickel-copper matrix inhibits qhov pib thiab nthuav tawm ntawm cov tshuaj chloride-induced localized corrosion, uas ua rau qis tag nrho corrosion thiab tsawg ua tsis tiav hauv kev txo cov kev pabcuam halide.
6. Txwv Oxidizing Acid txwv
Nws yuav tsum tau muab sau tseg tias 316 stainless hlau yog superior rau Monel 400 nyob rau hauv muaj zog oxidizing acid ib puag ncig xws li concentrated nitric acid. Monel 400 ntsib kev xeb sai hauv cov txheej txheem oxidizing, thaum 316 SS tseem muaj kev tiv thaiv zoo los ntawm nws cov yeeb yaj kiab passive. Qhov no txhais tau tias qhov zoo ntawm Monel 400 yog ib puag ncig tshwj xeeb, thiab kev xaiv cov khoom siv yuav tsum yog nyob ntawm qhov nruab nrab ua haujlwm, qhov kub thiab txias.
