A 316L stainless hlau lim caij muaj tshwj xeeb xeb thiab corrosion kuj, ua rau nws txhim khu kev qha hauv ntau daim ntawv thov. Txawm li cas los, nws tsis yog kiag li los yog mus tas li rustproof.
Hauv qab no yog cov lus piav qhia ntxaws:
Vim li cas 316L Stainless Hlau hu ua "Stainless"?
Cov cuab yeej "stainless" ntawm stainless hlau tsis txhais hais tias nws yeej tsis hnov mob nrog oxygen. Hloov chaw, nws muaj chromium (Cr), uas tsim ib qho ultra- nyias, ntom, thiab muaj zog passivation txheej (feem ntau chromium trioxide, Cr₂O₃) thaum raug huab cua. Cov txheej no zoo cais cov hlau los ntawm ib puag ncig sab nraud, tiv thaiv ntxiv oxidation (rusting) ntawm cov hlau hauv atoms.
316L stainless hlau ntxiv txhim kho qhov kev ua tau zoo nrog ob qhov tseem ceeb ntxiv:
Molybdenum (Mo): Ua kom muaj txiaj ntsig zoo rau cov tshuaj chlorides thiab pitting corrosion, ua rau nws zoo tagnrho rau cov cheeb tsam hnyav xws li dej hiav txwv, siab -cov dej qab ntsev, thiab qee yam tshuaj lom neeg.
Cov pa roj carbon tsawg (L=Cov pa roj carbon tsawg): Cov ntsiab lus carbon tsawg txo qhov kev pheej hmoo ntawm kev sib tsoo ntawm kev sib tsoo thaum lub sij hawm vuam thiab siab - qhov kub thiab txias, ua kom haum rau cov khoom siv welded thiab xav tau daim ntawv thov.
Raws li cov xwm txheej dab tsi tuaj yeem 316L Lim Element tseem xeb?
Txawm hais tias nws cov khoom zoo heev, 316L stainless hlau tuaj yeem corrode nyob rau hauv cov xwm txheej tshwj xeeb:
Ntev ntev raug rau cov tshuaj muaj corrosive heev:
Muaj zog Oxidizing Acids: Concentrated sulfuric acid los yog nitric acid yuav ua rau cov txheej txheem passivation.
Strong Reducing Acids: Hydrochloric acid los yog hydrofluoric acid yog corrosive heev thiab tuaj yeem cuam tshuam txawm tias 316L.
High -Tsub Concentrated Alkalis: tuaj yeem degrade cov txheej txheem passivation.
Ib puag ncig qhov twg Passivation Layer raug puas tsuaj tas mus li:
Mechanical Abrasion: Cov khoom tawv (xws li, xuab zeb, cov khib nyiab hlau) hauv cov kua dej tuaj yeem khawb thiab hnav cov lim dej, tiv thaiv cov txheej txheem passivation ntawm tus kheej - kho thiab ua rau corrosion.
Crevice Corrosion: Nyob rau hauv cov cheeb tsam xws li welds, threaded kev sib txuas, los yog qhov sib txawv ntawm cov hlau, stagnant xov xwm uas tsis tshua muaj oxygen theem yuav destabilize lub passivation txheej, ua rau lub zos corrosion.
Sib cuag nrog cov hlau tsis sib xws (Galvanic Corrosion):
Yog tias lub lim dej 316L txuas ncaj qha rau cov khoom siv carbon steel (piv txwv li, cov kav dej, flanges) hauv cov khoom siv electrolyte- nplua nuj ib puag ncig (xws li, huab cua ntub, dej), cov ntaub ntawv galvanic cell. Qhov ntau reactive carbon steel ua raws li cov anode thiab corrodes, thaum lub 316L (cathode) tseem tiv thaiv. Txawm hais tias 316L nws tus kheej tsis corrode, xeb los ntawm cov pa roj carbon steel tuaj yeem hloov mus rau nws qhov chaw, tsim kom muaj qhov tsis zoo ntawm xeb.
Deg Contamination:
Thaum lub sij hawm tsim khoom lossis kev teeb tsa, yog tias cov pa roj carbon steel plua plav lossis cov khib nyiab (piv txwv li, los ntawm cov cuab yeej lossis cov cuab yeej tuav) ua raws li 316L nto, cov khoom no tuaj yeem xeb thiab hloov cov stains mus rau cov hlau tsis huv. Qhov xeb ntawm sab saum toj no feem ntau tuaj yeem raug tshem tawm nrog kev ntxuav.
Xaus
316L stainless hlau lim cov ntsiab lus yog cov resistant rau xeb thiab corrosion nyob rau hauv feem ntau industrial, lag luam, thiab marine ib puag ncig. Lawv qhov kev ua tau zoo "stainless" yog nyob ntawm tus kheej - kho txheej txheej passivation.
Txhawm rau kom paub meej txog kev ua haujlwm ntev -:
Xaiv Cov Khoom Siv Zoo: Paub meej tias 316L yog qhov tsim nyog rau koj cov xov xwm tshwj xeeb, kev xav, thiab kub.
Kev Txhim Kho Kom Zoo: Tsis txhob sib cuag ncaj qha nrog cov hlau tsis sib xws thiab tiv thaiv kev sib kis ntawm cov cuab yeej carbon steel.
Kev tu tsis tu ncua: Tshawb xyuas qhov hnav los yog paug.
Rau ib puag ncig tshuaj lom neeg, xav txog qib siab dua -qib alloys (piv txwv li, Hastelloy) lossis tsis yog- cov khoom siv hlau.
