Corrosion kuj ntawm Monel 400 thiab 600 Inconel

Monel 400: Feem ntau muaj npib tsib xee thiab tooj liab, nrog cov ntsiab lus npib tsib xee nyob ib ncig ntawm 63% -70% thiab tooj liab txog 28% -34%. Nws tsuas muaj cov lej ntawm cov hlau, carbon, manganese, thiab lwm yam ntsiab lus, tsis muaj chromium ntxiv. Nws cov kev tiv thaiv corrosion yog tsuas yog nyob rau hauv synergistic nyhuv ntawm nickel thiab tooj liab.

Inconel 600: Nickel-based alloy nrog siab chromium (14% -17%) thiab hlau (6% -10%) ua cov ntsiab lus tseem ceeb alloying. Chromium muab kev muaj peev xwm passivation muaj zog hauv oxidizing ib puag ncig, thaum npib tsib xee tswj kev ruaj ntseg hauv kev txo qis thiab alkaline.

Txo cov kua qaub feem ntau suav nrog cov tsis-oxidizing acids xws li hydrofluoric acid, dilute sulfuric acid, hydrochloric acid, phosphoric acid nyob rau hauv cov xwm txheej uas tsis yog oxidizing.

Monel 400: Qhia tau zoo heev corrosion kuj nyob rau hauv feem ntau txo acid ib puag ncig. tooj liab nyob rau hauv lub alloy ho txhim kho nws stability nyob rau hauv hydrofluoric acid thiab dilute sulfuric acid; Nws yog tsis tshua muaj corroded los yog muaj ib tug tsawg heev corrosion tus nqi nyob rau hauv uas tsis yog-oxidizing, oxygen-dawb txo acid systems. Nws yog ib qho ntawm ob peb hom nickel alloys haum rau kev pabcuam mus sij hawm ntev hauv hydrofluoric acid ib puag ncig.

Inconel 600: Ua tsis zoo hauv cov kua qaub uas muaj zog, tshwj xeeb tshaj yog hydrofluoric acid thiab concentrated hydrochloric acid. Yog tsis muaj cov ntsiab lus tooj liab txaus, nws tsis tuaj yeem tsim cov yeeb yaj kiab tiv thaiv ruaj khov hauv kev txo cov kua qaub tawm. Tus nqi corrosion kuj yog siab heev, thiab hnyav hnyav hnyav los yog corrosion hauv zos yuav tshwm sim nyob rau hauv cov cua kub los yog siab-concentration tej yam kev mob. Yog li ntawd, Inconel 600 tsis pom zoo kom txo cov kua qaub.

Oxidizing acids muaj xws li concentrated nitric acid, concentrated sulfuric acid, chromic acid thiab lwm yam xov xwm uas muaj zog oxidizing zog.

Monel 400: Muaj kev cuam tshuam sai, hnyav corrosion hauv oxidizing acids. Cov nickel-tooj ​​liab matrix tsis tuaj yeem tsim cov yeeb yaj kiab tuab thiab ruaj khov nyob rau hauv oxidation muaj zog. Nws yuav muaj kev tiv thaiv corrosion los yog intergranular corrosion, yog li nws tsis muaj feem xyuam rau oxidizing acid tej yam kev mob.

Inconel 600: Cov txiaj ntsig los ntawm nws cov ntsiab lus chromium siab, uas tsim cov chromium oxide passive zaj duab xis nyob rau saum npoo hauv qhov chaw oxidizing. Nws muaj corrosion kuj zoo heev rau oxidizing acids xws li nitric acid, tshwj xeeb tshaj yog nyob rau hauv kub thiab concentrated oxidizing acid systems. Nws tuav tus nqi qis qis thiab kev ruaj ntseg zoo, ua rau nws siv dav hauv cov txheej txheem oxidizing acid.

Hauv cov organic acid ib puag ncig xws li acetic acid, citric acid, thiab lactic acid (feem ntau tsis muaj zog los yog nruab nrab),

Monel 400 muaj kev tiv thaiv corrosion zoo thiab tuaj yeem ua haujlwm ruaj khov nyob rau hauv nruab nrab qhov kub thiab txias.

Inconel 600 kuj ua tau zoo, tab sis nws qhov zoo dua tsis pom tseeb piv nrog Monel 400, thiab nws cov nqi siab dua.

Ob lub alloys tau siv dav hauv qhov chaw alkaline vim lawv cov ntsiab lus nickel siab, tab sis tseem muaj qhov sib txawv.

Monel 400: Nws muaj kev tiv thaiv zoo rau alkaline xov xwm, suav nrog cov dej qab zib caustic, potassium hydroxide, calcium hydroxide thiab lwm yam alkalis muaj zog. Nws yog ruaj khov nyob rau hauv ob qho tib si high-concentration thiab high-temperature alkaline daws, nrog ib tug tsawg corrosion tus nqi thiab tsis muaj kev ntxhov siab corrosion cracking nyiam nyob rau hauv feem ntau alkaline systems. Nws yog feem ntau siv rau hauv evaporation, crystallization thiab pipeline systems hauv caustic soda ntau lawm.

Inconel 600: Tsis tas li ntawd nthuav tawm zoo heev alkali corrosion kuj, tshwj xeeb tshaj yog nyob rau hauv high-kub molten alkali thiab muaj zog caustic ib puag ncig. Cov chromium tivthaiv ntxiv txhim khu kev ruaj ntseg ntawm cov zaj duab xis passive, ua rau nws txhim khu kev qha tshaj Monel 400 nyob rau hauv ultra-siab kub los yog tsis tshua muaj concentrated alkaline tej yam kev mob, xws li molten ntsev systems thiab high-temperature caustic kho khoom. Hauv cov pa nruab nrab-kub thiab nruab nrab-concentration alkaline ib puag ncig, qhov sib txawv ntawm ob lub alloys yog me me.

Txhawm rau nthuav qhia lawv cov xwm txheej siv tau zoo dua, qhov kev sib piv tau txuas ntxiv mus rau cov tshuaj chloride thiab cov huab cua kub ib puag ncig.

Chloride-muaj ib puag ncig (seawater, brine): Monel 400 muaj kev tiv thaiv zoo heev rau dej hiav txwv thiab chloride corrosion, muaj zog tiv thaiv pitting thiab crevice corrosion. Inconel 600 yog qhov yooj yim rau pitting thiab crevice corrosion nyob rau hauv ib puag ncig uas muaj cov tshuaj chloride, tshwj xeeb tshaj yog nyob rau hauv qhov chaw ruaj khov thiab kub kub, yog li Monel 400 yog qhov tsim nyog dua.

Kub-kub oxidizing cua: Inconel 600 muaj zoo heev kub-kub oxidation tsis kam thiab chav corrosion kuj mus txog ib ncig ntawm 1095 degree, deb tshaj Monel 400. Monel 400 yog nquag mus ceev corrosion thiab scaling ntawm high kub nyob rau hauv oxidizing atmospheres, yog li nws tsis haum rau oxidation lub sij hawm ntev high-temperature.

Hauv kev txo cov kua qaub (hydrofluoric acid, dilute non-oxidizing sulfuric acid, hydrochloric acid): Monel 400 yog qhov zoo tshaj rau Inconel 600 thiab yog cov khoom nyiam.

Hauv oxidizing acids (concentrated nitric acid, kub oxidizing acid systems): Inconel 600 yog qhov zoo tshaj plaws thiab yog tib txoj kev xaiv ntawm ob.

Feem ntau alkaline tej yam kev mob: Ob leeg alloys muaj kev ua tau zoo heev. Monel 400 yog kev lag luam rau cov pa alkaline ib puag ncig, thaum Inconel 600 yog qhov tsim nyog rau cov kub kub molten alkali thiab ultra-harsh alkaline tej yam kev mob.

Nyob rau hauv dej hiav txwv thiab chloride ib puag ncig: Monel 400 yog kev ntseeg siab dua. Nyob rau hauv qhov kub thiab txias oxidizing cua, Inconel 600 yog tib txoj kev xaiv.