Monel 400 yog npib tsib xee-tooj liab-solution alloy nrog ib tug raug muaj pes tsawg leeg ntawm kwv yees li 65% Ni, 33% Cu, ntxiv rau me me ntawm hlau, manganese, carbon thiab silicon. Nws yog dav siv nyob rau hauv aqueous ib puag ncig vim nws zoo heev corrosion kuj, tab sis nws cov kev ua tau zoo sib txawv ntawm cov dej tshiab thiab dej hiav txwv. Kev sib piv thiab kev txheeb xyuas qhov ntau yog raws li hauv qab no.
1. Kev coj tus cwj pwm nyob hauv dej ntshiab
Cov dej qab zib feem ntau muaj cov dej qab ntsev tsawg, tsis muaj chloride ion concentration, nruab nrab lossis tsis muaj zog alkaline pH, thiab txwv cov pa oxygen thiab microbial kev ua haujlwm.
Uniform Corrosion Rate
Monel 400 forms a stable, dense passive oxide film dominated by nickel and copper oxides/hydroxides in freshwater. Cov yeeb yaj kiab no zoo thaiv kev sib txuas ntxiv ntawm cov hlau matrix thiab corrosive media. Nyob rau hauv ib txwm kub thiab zoo li qub los yog qeeb-ntws dej tshiab, nws cov corrosion tsis zoo tus nqi qis heev, feem ntau tsawg dua 0.000025∼0.000051 mm / xyoo (sib npaug rau 0.001∼0.002 mpy, mils ib xyoos).
Localized Corrosion Risk
Pitting corrosion, crevice corrosion thiab stress corrosion cracking (SCC) yog negligible nyob rau hauv cov pa dej tshiab. Tsuas yog nyob rau hauv cov dej qab ntsev uas muaj kuab heev nrog cov pa oxygen siab lossis cov pa phem hnyav tuaj yeem ua rau lub zos corrosion tshwm sim ntawm tus nqi qeeb.
Daim ntawv thov kev ua haujlwm
Monel 400 tuaj yeem ua tiav qhov kev pabcuam ruaj khov nyob rau lub sijhawm ntev hauv cov dej tshiab xws li cov kav dej txias, cov tso tsheb hlau luam, thiab cov khoom siv kho dej, feem ntau nrog kev pab cuam lub neej ntawm kaum xyoo raws li kev ua haujlwm zoo.
2. Corrosion Cwj Pwm hauv Seawater
Seawater yog ib qho nyuaj electrolyte nrog cov ntsiab lus chloride siab (kwv yees li 19,000∼35,000 mg / L), nruab nrab pH, ntau cov pa oxygen, thiab cov kab mob marine. Cov yam ntxwv no zoo heev hloov cov txheej txheem corrosion ntawm Monel 400.
Uniform Corrosion Rate
Nyob rau hauv cov dej ntws zoo, zoo aerated seawater, Monel 400 tseem tuav tau zoo corrosion kuj. Cov zaj duab xis passive tuaj yeem kho tus kheej raws li hydrodynamic scouring. Tus nqi tsis sib xws feem ntau yog khaws cia ntawm 0.000025∼ 0.000127 mm / xyoo (0.001∼0.005 mpy), uas nyob ze rau hauv dej tshiab.
Localized Corrosion Risk (Qhov txawv tseem ceeb)
Pitting thiab Crevice Corrosion: Cov ntsiab lus siab ntawm chloride ions tuaj yeem nkag mus thiab rhuav tshem cov zaj duab xis passive, tshwj xeeb tshaj yog nyob rau hauv cov dej ntws tsis zoo los yog qis qis, cov dej ntws, thiab cov cheeb tsam uas muaj los ntawm marine biofouling. Pitting thiab crevice corrosion dhau los ua qhov tseem ceeb tsis ua hauj lwm hom, thiab tus nqi corrosion hauv zos tuaj yeem yog kaum lossis ntau pua lub sij hawm siab dua li tus nqi tsis sib xws.
Sulfide-Induced Corrosion: Hauv cov pa oxygen-tsis zoo, muaj kuab paug ntawm ntug hiav txwv dej hiav txwv los yog cov av qeeg, cov kab mob sulfate-txo cov kab mob tsim hydrogen sulfide. Monel 400 yog rhiab heev rau H2S, uas ua rau cov yeeb yaj kiab tawg thiab kev xeb hauv zos, thiab tej zaum yuav ua rau muaj kev cuam tshuam hydrogen embrittlement.
Flow-Induced Erosion-Corrosion: Ntawm cov dej ntws siab lossis nyob rau hauv cov xwm txheej cavitation, qhov sib xyaw ua ke ntawm cov kua dej scouring thiab electrochemical corrosion tsub kom tag nrho cov corrosion kuj tseem ceeb.
Daim ntawv thov kev ua haujlwm
Monel 400 yog dav siv nyob rau hauv marine ib puag ncig xws li seawater pipelines, twj, li qub, thiab propeller shafts, tab sis nws yuav tsum tau tsim kev ntsuas xws li tsis txhob tuag zones, txo crevices, thiab siv antifouling kev kho mob los tswj localized corrosion.
