Thaum Cartridge Heaters ntsib Corrosive Ib puag ncig: Cov Khoom Siv Xaiv Ciaj sia nyob Qhia

Kev raug tshuaj lom neeg ua rau cov cua sov ua kom nrawm dua li lwm yam kev ua haujlwm, tab sis xaiv cov khoom siv feem ntau tsuas yog muab cov cursory saib thaum lub sijhawm tshwj xeeb. Lub tswv yim hais tias stainless hlau tsis corrode txhua yam ua rau raug nqi yuam kev hauv cov nroj tsuag tshuaj, cov khoom noj khoom haus, thiab txawm tias cov chaw ua haujlwm zoo. Paub tias cov hlau sib txawv li cas rau qee yam teeb meem tshuaj yog dab tsi ua rau qee cov cuab yeej siv tau ntau xyoo thaum lwm tus yuav tsum tau hloov txhua lub hlis.

Chloride tej yam kev mob yog cov feem ntau nthuav thiab txaus ntshai qhov chaw rau corrosion tshwm sim. Cov huab cua ntsev raws ntug dej hiav txwv, ntxuav cov tshuaj hauv cov khoom noj khoom haus, thiab cov txheej txheem tshuaj hauv kev lag luam tshuaj txhua tus ntxiv chloride ions uas tawm tsam zoo tib yam 304 stainless hlau los ntawm pitting thiab kev nyuaj siab corrosion cracking. Cov txheej txheem pib nrog chloride tau los ntawm cov txheej txheem oxide passive uas thaiv cov hlau tsis muaj steel. Qhov no yog ua raws li cov kua qaub hauv zos uas tau noj sai sai ntawm lub hauv paus hlau. Thaum pitting pib, qhov kev tawm tsam nrawm dua vim tias lub qhov dej tsim ib puag ncig uas tsis tshua muaj oxygen thiab muaj kua qaub, uas txhawb kev tawm tsam ntau dua.

Piv rau cov hlau tsis tu ncua, Incoloy 800 thiab 840 alloys zoo dua ntawm kev tiv thaiv chloride. Cov npib tsib xee - hlau-chromium alloys ua kom lawv cov khaubncaws sab nraud povtseg ruaj khov rau hauv qhov chaw uas 304 stainless hlau yuav tawg. Oxide cov qauv uas tiv taus ntau dua yog tsim los ntawm kev ntxiv npib tsib xee ntxiv, uas feem ntau yog 30-35%. Muaj qib chromium txog 20% ​​muab kev tiv thaiv ntxiv rau koj. Incoloy tsis yog ib qho kev xaiv zoo rau cov chaw uas muaj cov tshuaj chloride ntau, nrog rau cov chaw hauv hiav txwv, kev siv ntsev tseem ceeb, lossis kev ua tshuaj lom neeg. Nws yog qhov tsim nyog.

Cov khoom sib txawv yuav tsum tau xav txog hauv cov xwm txheej acidic. Cov kua qaub sib txawv, zoo li sulfuric acid, hydrochloric acid, thiab cov organic acids sib txawv, tua cov hlau sib txawv. Sulfuric acid ua rau cov khoom sib xyaw ua ke thiab ua rau hydrogen nkig. Hydrochloric acid aggressively lov tiv thaiv oxides. Corrosion tus nqi hloov ntau nrog concentration thiab kub. Piv txwv li, dilute acids nyob rau hauv chav tsev kub yuav ua tau zoo, thaum concentrated los yog rhuab acids xav tau tshwj xeeb alloys los yog tiv thaiv txheej.

Caustic ib puag ncig tsis muaj ntau heev hauv kev tsim khoom tsis tu ncua, txawm li cas los xij lawv tshwm sim thaum tu lossis ua qee yam txheej txheem tshuaj. Aluminium thiab ntau yam stainless hlau raug puas tsuaj los ntawm sodium hydroxide thiab potassium hydroxide daws los ntawm caustic cracking. Incoloy kuj yog qhov zoo rau cov kev siv no txij li cov nickel alloys siab heev tiv taus rau caustic nres. Tab sis koj yuav tsum tau xyuas qhov tseeb concentration thiab kub ntawm caustic tiv thaiv corrosion rooj, vim hais tias tus nqi nres mus sai heev tshaj cov theem.

Atmospheric corrosion, uas feem ntau tsis tau txais txiaj ntsig txaus, maj mam tawg cov cua sov hauv cov chaw ua haujlwm. Cov txheej txheem combustion tso tawm sulfur dioxide, tub yees lossis tshuaj ua haujlwm tso tawm ammonia vapors, thiab cov organic vapors sib txawv tsim cov coatings ntawm cov hlau. Corrosion nyob rau sab nraud ntawm lub sheath ua rau phab ntsa nyias, uas nws thiaj li ua rau lub qhov uas cia cov txheej txheem kua hauv los yog hluav taws xob tawm. Tsis tu ncua xyuas qhov chaw sab nraud pom qhov kev puas tsuaj ua ntej nws ua rau muaj kev puas tsuaj loj.

Sab hauv xeb, txawm tias nws nyuaj rau pom, yog qhov phem. Cov txheej txheem cov kua dej uas nkag los ntawm lub davhlau ya nyob twg ntsaws ruaj ruaj los yog sheath ua txhaum cai tuaj rau hauv kev sib cuag nrog cov khoom tiv thaiv thiab magnesium oxide rwb thaiv tsev. Dej, aqueous daws, los yog vapors uas yuav condensed rau hauv cov kua ua corrosive thaum rhuab. Thaum qhuav, magnesium oxide yog cov khoom siv hluav taws xob zoo thiab hluav taws xob insulator. Txawm li cas los xij, thaum nws los rau hauv kev sib cuag nrog cov kev daws teeb meem ionic, nws dhau los ua conductive. Qhov kev ua qias tuaj sab hauv no ua rau muaj kev ua txhaum hauv av, muaj txiaj ntsig tsis zoo, thiab kev ua tsis tiav.

Kev tiv thaiv davhlau ya nyob twg mus dhau tsuas yog cov sheath thaum nws los xaiv cov khoom. Epoxy ntsaws ruaj ruaj, Teflon leads, thiab silicone roj hmab khau looj plab hlaub tiv thaiv qhov chaw uas cov ntaub thaiv npog xaus. Cov khoom no yuav tsum muaj peev xwm tswj tau cov tshuaj nyob hauv lawv ib puag ncig thaum tseem ua tau yooj yim thiab tsis tso hluav taws xob los ntawm. Nyob rau hauv ib puag ncig hnyav tshuaj, qhov kawg ntawm lub davhlau ya nyob twg feem ntau ua tsis tiav ua ntej qhov cua sov. Qhov no txhais tau hais tias xaiv txoj cai sheath alloy yog ib qho tseem ceeb raws li sealing nws kom zoo.

Thaum cov hlau zoo tib yam tsis ua haujlwm lossis tsis raug nqi - siv tau, cov txheej tiv thaiv yog ib qho kev xaiv. Ntau hom txheej, xws li ceramics, polymers, thiab hlau, tuaj yeem tiv thaiv qee yam khoom. Tab sis coatings kuj tuaj nrog lawv tus kheej cov teeb meem, xws li thermal expansion mismatch, pinhole faults, thiab puas thaum lub sij hawm installation. Koj yuav tsum tau ceev faj heev nrog cov cua sov coated, thiab lawv yuav xav tau cov kauj ruam ntxiv los hloov lawv. Nws nyob ntawm tus yam ntxwv ntawm daim ntawv thov thiab muaj peev xwm ua kom nws mus txog hnub seb puas yuav siv cov cua sov coated lossis cov ntaub ntawv zoo dua qub.

Kev ntsuam xyuas cov tshuaj sib raug zoo yuav zoo li tsis muaj -brainer, tab sis tib neeg feem ntau tsis quav ntsej nws vim tias lawv luv sij hawm los yog xav tias lawv paub tias "tus qauv" cov ntaub ntawv yog dab tsi. Kev ntsuas dej ntawm cov khoom siv yav tom ntej hauv cov txheej txheem ua kua dej, ntawm qhov ua haujlwm kub thiab nrog thermal cycling, qhia tau hais tias qhov tsis zoo uas qhov ntsuas ntsuas tuaj yeem plam. Cov txheej txheem dej feem ntau muaj me me ntawm impurities, oxidation cov khoom uas tsis tau npaj rau, los yog hloov cov compositions uas hloov lawv corrosive li cas. Kev sim hauv lub ntiaj teb tiag tiag, txawm tias nyob rau hauv cov ntaub ntawv yooj yim, ua rau cov cuab yeej tsim khoom los ntawm kev tawg thiab raug nqi nyiaj ntau.

Tag nrho cov nqi ntawm cov tswv cuab yog cuam tshuam los ntawm corrosion thaum lub sij hawm, uas cuam tshuam rau kev lag luam ntawm cov khoom siv. Nws yog qhov tseeb tias lub rhaub dej kub uas raug nqi ob zaug ntau dua tab sis kav tsib zaug ntev npaum li qhov zoo dua. Tab sis qhov kev ntsuam xyuas no yuav tsum tau coj mus rau hauv tus account cov nuj nqis ntawm kev teeb tsa, kev ncua sijhawm, cov khoom lag luam poob, thiab kev pheej hmoo ntawm kev nyab xeeb uas tuaj nrog kev ua tsis tiav. Smart procurement saib ntau tshaj li tus nqi ntawm cov khoom. Nws tseem saib cov nqi tshaj qhov khoom tag nrho lub neej.

Cov kev cai ib puag ncig kuj ua rau nws nyuaj rau xaiv cov khoom. Qee qhov kev siv, xws li kev sib cuag zaub mov thiab cov khoom siv kho mob, tsuas yog tso cai rau qee yam alloys thiab kho qhov chaw. Terminal qhov chaw thiab cov khoom siv sab hauv raug cuam tshuam los ntawm RoHS ua raws thiab cov cai sib piv. Cov kev cai no ua rau nws nyuaj rau xaiv cov ntaub ntawv, tab sis lawv kuj ua kom pom tseeb tias qhov twg zoo siv.