Thaum 304 stainless hlau tau ua koob tsheej raws li ntau yam thiab tus nqi - cov khoom siv tau zoo rau suav tsis txheeb cov khoom lag luam, nws daim ntawv thov hauvcartridge rhaubharbors ib tug tshwj xeeb thiab feem ntau underestimated vulnerability: susceptibility rau chloride-induced corrosion. Qhov kev qaug zog no tsis yog ib qho lus taw qhia xwb tab sis qhov tseem ceeb, qhov system- qib kev txiav txim siab rau cov txheej txheem thermal ua haujlwm hauv ib puag ncig xws li kev ua zaub mov, cov chaw hauv hiav txwv lossis ntug hiav txwv, kev ua tshuaj lom neeg, lossis txhua qhov chaw muaj chlorides.
Lub npe nrov corrosion kuj ntawm 304 stainless hlau stems los ntawm ib tug nyias, tsis pom, thiab nws tus kheej - kho "passive zaj duab xis" ntawm chromium oxide ntawm nws nto. Cov txheej no muaj txiaj ntsig zoo tiv thaiv ntau cov oxidizing acids thiab feem ntau atmospheric raug. Txawm li cas los xij, qhov kev tiv thaiv no muaj kryptonite:chloride ions. Muaj nyob rau hauv cov dej ntsev, txoj kev de- cov ntsev ntsev, ntau cov khoom noj khoom haus, cov tshuaj hauv pas dej da dej, thiab cov khoom siv hauv tsev (xws li tshuaj ntxuav tes - cov tshuaj tua kab mob raws li cov tshuaj tua kab mob), chlorides tuaj yeem rhuav tshem cov yeeb yaj kiab tiv thaiv hauv zos. Qhov tshwm sim yog tsis sib xws nto xeb, tab sis ib tug deb ntau insidious thiab puas daim ntawv ntawm kev tawm tsam:pitting corrosion.
Pitting corrosion yog ib qho chaw hauv zos, autocatalytic txheej txheem. Thaum ib qho tshuaj chloride ion ua txhaum cov zaj duab xis passive ntawm qhov tsis zoo ntawm lub tshuab microscopic lossis suav nrog hauv cov hlau, nws tsim qhov chaw me me anodic. Qhov no pib muaj kev txhoj puab heev, concentrated electrochemical cell. Lub qhov, ua raws li ib tug me me anode, corrodes sai sab hauv, thaum lub cheeb tsam loj cathode (cov ntaub ntawv tsis zoo passive) tsav cov tshuaj tiv thaiv. Qhov no tsim qhov tob, nqaim kab noj hniav uas nkag mus rau phab ntsa sheath nrog kev nrawm nrawm, feem ntau nrog cov lus ceeb toom me me ntawm qhov chaw. Rau ibcartridge rhaub, ib qhov perforating ib leeg yog ib qho kev tshwm sim davhlau ya nyob twg. Nws muab txoj hauv kev ncaj qha rau cov dej noo, cov txheej txheem ua kua dej, lossis cov tshuaj ntxuav kom nkag mus rau hauv lub rhaub dej sab hauv. Qhov no ingress tam sim ntawd cuam tshuam cov magnesium oxide rwb thaiv tsev, feem ntau ua rau hauv av txhaum, luv luv Circuit Court, thiab ceev cua kub burnout, feem ntau nrog rau kev nyab xeeb kev mus ncig los yog cov khoom puas.
Thaum tshav kub kub ua raws li lub zog acceleratornyob rau hauv txoj kev puas tsuaj no. Ua haujlwm siab kub exponentially nce kinetics ntawm cov tshuaj tiv thaiv electrochemical. A 304 stainless hlaucartridge rhaubuas tej zaum yuav ua tau flawlessly rau xyoo nyob rau hauv qhuav, kub -tswj nyob rau hauv tsev yuav succumb mus pervasive pitting thiab ua tsis tau tejyam nyob rau hauv mere lub hlis nyob rau hauv ib tug ntub ntug dej hiav txwv ntim cov nroj tsuag, ib tug seafood ua kab siv saline sprays, los yog ib tug bakery qhov chaw uas nightly huv -downs muaj chloride{{2} raws li. Kev sib xyaw ua ke ntawm cov cua sov, noo noo, thiab cov tshuaj chlorides tsim ib qho chaw nruj heev uas thawb tus qauv 304 stainless hlau tshaj nws cov kev txwv.
Yog li ntawd, kev ntsuam xyuas nruj ntawm qhov chaw ua haujlwm tsis yog -kev sib tham.Yog tias daim ntawv thov cuam tshuam nrog kev sib cuag ncaj qha, nquag txaws, lossis txawm tias huab cua tsis tu ncua rau cov dej ntsev, siab - huab cua ntawm ntug dej hiav txwv, cov txheej txheem dej chlorinated, lossis chloride- muaj tshuaj, 304 stainless hlau feem ntau yog ib qho kev xaiv tsis tsim nyog thiab pheej hmoo.Hauv cov xwm txheej no, tus nqi pib ntau dua ntawm kev kho dua tshiab cov ntaub ntawv sheath sawv cev rau ib qho ntawm cov nqi tshaj plaws - kev txiav txim siab zoo rau lub sij hawm ntev - kev ntseeg tau.
Tus txheej txheem upgrade txoj kev yog mus316 / L stainless hlau. Qhov sib txawv tseem ceeb yog qhov sib ntxiv ntawm 2-3% molybdenum. Cov khoom no ua rau muaj kev tiv thaiv zoo rau pitting thiab crevice corrosion hauv chloride-cov kabmob ib puag ncig los ntawm kev ntxiv dag zog rau cov txheej txheem oxide passive. Rau qhov mob hnyav dua -xws li hauv cov kua qaub uas muaj kuab heev, cov kua qaub chloride tov, lossis cov ntawv thov sab nrauv-nickel-based alloys tshwj xeeb dua lilus 825los yogHastelloy C-276tej zaum yuav xav tau.
Ib qho ntxiv, feem ntau overlooked yam yogfabrication zoo. Cov txheej txheem ntawm vuam terminals los yog cov ntsaws ruaj ruaj rau hauv lub tshuab cua sov sheath tsim ibThaum tshav kub kub-Affected Zone (HAZ). Yog tias tsis ua tiav nrog cov txheej txheem tsim nyog (xws li siv qis- cua sov- tawm tswv yim TIG vuam) thiab ua raws li kev ceev fajpost-welding tu thiab passivation, HAZ tuaj yeem dhau los ua de-sensitized thiab cuam tshuam rau corrosion ntau dua li cov niam txiv hlau, tsim kom muaj qhov pib ua tsis tiav. Reputable manufacturers ua raws li nruj welding thiab tiav cov txheej txheem los khaws cov kev tiv thaiv corrosion ntawm cov hlau.
Hauv kev xaus, qhia txog acartridge rhaubxav tau ib tug holistic saib uas muab sib npaug qhov hnyav rau thermal thiab tshuaj ib puag ncig. Nkag siab txog kev hem thawj corrosive-tshwj xeeb tshaj yog los ntawm cov tshuaj chlorides- yog qhov tseem ceeb xws li suav cov wattage thiab kub profiles. Kev txiav txim siab xaiv cov khoom siv sheath uas tsim los rau cov kev sib tw tshwj xeeb, xws li 316 stainless hlau, thiab tshawb xyuas qhov siab - kev coj ua zoo, yog lub tswv yim zoo tshaj plaws los ua kom tsis txhob muaj "tus neeg tua neeg uas ntsiag to." Qhov kev ua haujlwm zoo tshaj plaws no tiv thaiv lub sijhawm tsis tau npaj tseg, ua kom muaj kev nyab xeeb ntawm kev ua haujlwm, thiab muab tus nqi qis dua ntawm kev ua tswv cuab los ntawm kev ua kom muaj peev xwm ntawm cov khoom siv nrog tiag tiag - cov kev pabcuam hauv ntiaj teb.
