Corrosion yog ib qho ntawm cov ntsiab tseem ceeb tshaj plaws uas ua rauib lub dab tsi uas qhib thiab kawkev puas tsuaj. Yog li ntawd, nyob rau hauvib lub dab tsi uas qhib thiab kawKev tiv thaiv, valve tiv thaiv corrosion yog qhov teeb meem tseem ceeb los xav txog.
Ib lub dab tsi uas qhib thiab kawCorrosion Daim Ntawv
Kev ua kom haum ntawm cov hlau feem ntau yog tshwm sim los ntawm kev siv tshuaj corrosion thiab electrochion corrosion, thiab kev xeb ntawm cov ntaub ntawv tsis yog xim hlau feem ntau tshwm sim los ntawm kev ua yeeb yam thiab ua lub cev.
1. Tshuaj Corrosion
Nyob rau hauv cov xwm txheej uas tsis muaj tam sim no yog tsim tawm, nruab nrab nruab nrab ncaj qha rau cov hlau thiab rhuav tshem cov roj corrosion thiab tsis muaj roj ntau thiab tsis yog-electrolytic.
2. Galvanic corrosion
Cov hlau muaj kev sib cuag nrog cov electrolyte, uas ua rau cov tshuab hluav taws xob, uas ua rau nws tus kheej kom puas los ntawm kev ua kom xeb.
Hom kua qaub hom ntsev ua kua xeb, pitting kev txhim kho, pob zeb me me ntawm cov hlau stainless, thiab lwm yam electrochemical corrosion. Electrochemical corrosion tsis tsuas yog tshwm sim ntawm ob qho tshuaj uas tuaj yeem ua rau muaj kev sib txawv ntawm cov pa, tab sis kuj tseem sib txawv ntawm cov qauv ntawm cov khoom, thiab lwm yam, thiab Tau txais lub zog ntawm corrosion, yog li ntawd cov hlau nrog cov peev xwm tsawg thiab txoj hauj lwm ntawm lub hnub qhuav qhuav.
Valve Corrosion
Tus nqi ntawm corrosion tau muab faib ua qib:
(1) Ua tiav kev txhim kho-tiv taus: tus nqi corrosion tsawg dua 0.001 hli / xyoo
(2) Kev tiv thaiv tsis tshua muaj zog: Corrosion tus nqi 0.001 txog 0.01 hli / xyoo
(3) Corrosion Kuj: Corrosion tus nqi 0.01 txog 0.1 mm / xyoo
(4) tseem corrosion resistant: corrosion tus nqi 0.1 rau 1.0 hli / xyoo
(5) Kev tsis zoo corrosion tsis kam: corrosion tus nqi 1.0 txog 10 hli
(6) tsis xeb-resistant: tus nqi corrosion yog ntau dua 10 mm / xyoo
Cuaj tsam kev ntsuas corrosion
1. Xaiv Cov Khoom Siv Corrosion-resistant cov ntaub ntawv raws li cov khoom nruab nrab
Nyob rau hauv qhov tseeb ntau lawm, cov xeb ntawm qhov nruab nrab yog qhov nyuaj heev, txawm tias lub valve cov khoom siv nyob rau hauv nruab nrab yog sib txawv, thiab corrosion ntawm nruab nrab rau cov khoom siv yog tsis zoo ib yam. Rau txhua 10 ° C nce rau nruab nrab kub, tus qauv corrosion nce li ntawm 1 ~ 3 zaug.
Qhov nruab nrab concentration muaj cov cawv muaj txiaj ntsig ntawm kev xeb ntawm cov hmoov txhuas ntawm cov sulfuric nrog lub ntsej muag me me, thiab thaum cov kab xeb ntau dua li 96%, kev xeb nce siab heev. Cov pa roj carbon hlau, ntawm qhov tsis sib xws, muaj cov sulpuric loj tshaj plaws thaum cov sulfuric acid ensoring mus rau ntau dua 60%, cov xeb tsawg tsawg. Piv txwv li, txhuas yog corrosive heev nyob rau hauv concentrated nitric acid nrog rau ntau dua 80%, tab sis nws yog heev tiv taus ntau dua 80%, tab sis nws yog hnyav rau hauv Ntau tshaj 95% concentrated nitric acid.
Los ntawm cov piv txwv saum toj no, nws tuaj yeem pom tau tias kev xaiv kom raug ntawm cov xwm txheej valve yuav cuam tshuam rau kev txhim kho corrosion, thiab xaiv cov ntaub ntawv raws li cov phau ntawv tiv thaiv corrosion.
2. Siv cov ntaub ntawv tsis yog xim hlau
Tsis yog xim hlau corrosion kuj zoo heev, ntev li ntev tau qhov kub thiab lub zog ntawm lub valve cov cai, nws tsis tuaj yeem daws cov teeb meem corrosion, tab sis kuj tseem txuag cov hlau. Lub cev lub cev, lub pob zeb, ob sab, hauv qab npoo thiab lwm cov khoom siv uas tsis yog xim hlau yog tsim.
Cov plastics xws li PTFE thiab chlorinated polyether, xws li muaj roj hmab muaj roj av, nitrile, nitrile roj hmab bonnet yog ua los ntawm cam khwb cia hlau thiab cov roj carbon hlau. Nws tsis tsuas yog ua kom lub zog ntawm lub valve, tab sis kuj tseem ua kom lub valve tsis corroded.
Tam sim no, ntau dua thiab ntau dua plastics xws li Nylon thiab PTFE siv, thiab cov roj hmab siv hluavtaws thiab cov khoom siv hluav taws xob, uas siv rau ntau lub qub. Cov ntaub ntawv tsis yog xim hlau siv los ua cov chaw sib khi tsis tsuas yog muaj kev ua tau zoo corrosion, tab sis kuj tseem tsim nyog siv rau kev tshaj xov xwm nrog cov lus. Ntawm chav kawm, lawv tsis tshua muaj zog thiab cov cua sov tiv taus, thiab cov ntau ntawm cov ntawv thov txwv.
3. Hlau saum npoo kho
(1) Kev sib txuas valve: lub valve kev txuas lus qwj yog feem ntau kho nrog galvanizing, thiab oxidation (xiav) los txhim kho lub peev xwm los tawm tsam cov atmospheric thiab kev txhim kho kev mob siab thiab nruab nrab. Ntxiv rau cov txheej txheem saum toj no, lwm lub fasteners kuj tseem kho nrog kev kho cov npoo xws li phosphalled raws li qhov xwm txheej.
(2) Cov chaw nyob thiab kaw cov cheeb tsam nrog cov txheej txheem me
(3) Quav los tiv thaiv corrosion: nitriving, boronization, chrome kev kho mob yog siv dav dav los txhim kho nws cov txheej txheem kev kho kom dav, corrosion tsis kam thiab rhuav tshem.
Kev kho cov roj sib txawv yuav tsum tsim nyog rau cov khoom sib txawv, hauv cov chaw ua haujlwm, tuaj yeem siv cov txheej txheem nyuaj (roj av tsis siv cov txheej txheem): hauv hydrogen Sulfide ib puag ncig siv electroplating siab phosphorus nickel nockor nickel nolating muaj kev tiv thaiv zoo dua; 38crrmooa tuaj yeem yog corrosion-resistant los ntawm ion thiab roj nitriving, tab sis nyuaj chrome txheej tsis haum rau siv; 2C3 tuaj yeem tiv taus ammonia corrosion tom qab quenching, thiab cov pa roj carbon monoxide, thiab cov roj pauv muaj roj , thiab nws feem ntau yog siv los ua valve stals.
(4) Cov Hluav Taws Xob Me-Caliber
4. Thermal txau
Thermal txau yog hom txheej txheem kev npaj cov txheej txheem, thiab tau dhau los ua ib qho ntawm cov thev naus laus zis tshiab rau cov khoom sib txawv. Nws yog qhov saum npoo ntxiv dag zog txoj kev uas siv hluav taws xob kub, roj hluav taws xob kub, roj hluav taws xob, cov ntaub ntawv hluav taws xob lossis cov khoom siv hlau, thiab tshuaj tsuag rau lawv Pretreated yooj yim nto nyob rau hauv daim ntawv ntawm atomization los ua cov tshuaj pleev zom, yog li ntawd cov txheej txheem yooj yim dua ntawm cov txheej txheem ntawm cov txheej txheem vuam plua plav.
Feem ntau cov hlau thiab lawv cov alloys, hlau oxide ceramics, cov hlau sib xyaw ua ke, hnav tsis kam, muaj kub ua tsis kam thiab lwm yam Cov cuab yeej, thiab muaj lub sijhawm ua haujlwm lub neej. Thermal txau tshwj xeeb txheej, nrog rwb thaiv tsev kom sov, hluav taws xob tiv thaiv, siv hluav taws xob tshwj xeeb, kev siv hluav taws xob kev txau tuaj yeem kho cov khoom.
5. Txau xim
Cov txheej yog qhov dav dav siv los tiv thaiv corrosion, thiab nws yog ib qho tsis tseem ceeb los tiv thaiv kev tiv thaiv corrosion thiab tus cim qhia cim ntawm cov khoom lag luam valve. Txheej tseem yog cov khoom siv tsis yog xim hlau, uas feem ntau yog ua los ntawm cov khoom siv hluavtaws, roj hmab slurry, npog qhov nruab nrab thiab cov laj thawj ntawm kev tiv thaiv corrosion.
Txheej ci tsuas yog siv hauv dej, ntsev dej, dej hiav txwv, huab cua thiab lwm qhov chaw uas tsis yog corrosive. Sab hauv kab noj ntawm lub pob valve feem ntau tau pleev xim nrog cov xim anticorrosive pleev xim kom tiv thaiv dej, huab cua thiab lwm yam xov xwm los ntawm corroding lub valve
6. Ntxiv rau cov tubnrosion inhibitors
Tus txheej txheem uas corrosion inhibitors tswj corrosion yog tias nws txhawb nqa polarization ntawm lub roj teeb. Corrosion inhibitors yog siv hauv xov xwm thiab cov puv. Qhov kev sib ntxiv ntawm kev txhim kho kom qeeb rau cov khoom siv hauv cov pa roj av, xws li solubrine dawb hauv lub xeev, corrosion stainless hlau, corrosion loj dua, tab sis ntxiv me me tus nqi ntawm tooj liab sulfate lossis nitric acid thiab lwm yam oxidants tig mus rau hauv lub xeev tsis muaj zog, yog tias muaj cov tshuaj tsw qab, yog tias muaj cov oxidant me me, yog tias muaj me me ntawm oxidant yog ntxiv, tus corrosion ntawm titanium tuaj yeem txo.
Valve siab ntsuas feem ntau yog siv los ua nruab nrab rau kev kuaj siab, uas yog qhov yooj yim los ua kom haum ntawm covib lub dab tsi uas qhib thiab kaw, thiab ntxiv ib qho me me ntawm sodium nitrite rau cov dej tuaj yeem tiv thaiv kev xeb ntawm lub valve los ntawm dej. Asbestos packing muaj corrooride, uas corrodes lub valve cov ntsiab lus tau zoo heev, thiab cov qauv chloride tuaj yeem siv tau yog tias cov cooting dej ntxuav txoj kev, thiab tsis tuaj yeem nrov feem ntau, thiab tsuas yog tsim nyog rau tshwj xeeb xav tau.
Txhawm rau tiv thaiv lub pob valve thiab tiv thaiv cov tshuaj asbestos, cov neeg ua haujlwm hauv cov roj corrosion, cov neeg ua kom haum rau cov pa hluav taws xob, cov tshuaj pleev xeb ntawm cov pa roj ntsha passivation zaj duab xis nyob rau saum npoo ntawm lub valve kav thiab txhim kho cov kab corrosion thiab cov kuab tshuaj tuaj yeem ua rau lub zog corrosion inhibitor maj mam yaj; Qhov tseeb, Zinc kuj tseem yog ib qho corrosion inhibitor, uas tuaj yeem ua ke nrog cov kab chloride nyob rau hauv asbestos, yog li cov chloride hu rau, thiaj li ua tiav lub hom phiaj ntawm kev tawm tsam corrosion.
7. Electrochemical tiv thaiv
Muaj ob hom electrochemical kev tiv thaiv: anodic tiv thaiv thiab kev tiv thaiv catodic. Yog tias zinc yog siv los tiv thaiv cov hlau, zinc tau cog qoob loo, hauv kev tiv thaiv kev tsim khoom, anode kev tiv thaiv yog siv ntau cov Cathodic yog siv ntau dua. Qhov kev tiv thaiv kev tiv thaiv Cathodic yog siv rau cov li qub thiab qhov tseem ceeb, thiab zinc ntxiv rau cov khoom lag luam Asbestos los tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob valve kom tiv thaiv lub pob hluav taws xob.
8. Tswj cov chaw muaj kev xeb
Lub npe hu ua ib puag ncig muaj ob hom kev nkag siab thiab qhov kev nkag siab dav dav ntawm ib puag ncig ntawm ib puag ncig ntawm ib puag ncig yog hais txog cov xwm txheej nyob ib puag ncig lub valve qhov chaw Cov.
Feem ntau feem ntau cov chaw ib puag ncig tsis tuaj yeem tswj tsis tau, thiab cov txheej txheem ntau lawm tsis tuaj yeem hloov pauv. Tsuas yog nyob rau hauv rooj plaub uas yuav tsis muaj kev puas tsuaj rau cov khoom lag luam thiab cov txheej txheem, txoj kev tswj hwm ib puag ncig boiler, alkali ntxiv rau cov txheej txheem boiler los kho tus nqi pH, thiab lwm yam los ntawm qhov no Taw qhia, qhov sib ntxiv ntawm kev tiv thaiv corrosion inhibitors thiab electrochemical kev tiv thaiv tau hais los saum toj no kuj yog ib txoj hauv kev los tswj cov kev xeb kev xeb.
Cov huab cua yog tag nrho ntawm cov plua plav, dej haus luam yeeb, xws li cov pa luam yeeb, cov hmoov ntau yam tau raug tsa los ntawm kev xeb ntawm corrosion rau lub valve. Tus neeg teb xov tooj yuav tsum tsis tu ncua ntxuav thiab ntxuav lub valve thiab ua tsis tu ncua raws li cov kev cai ntawm cov kev ua haujlwm ntawm cov kev ua haujlwm ib puag ncig corrosion. Txhim kho lub npog tiv thaiv ntawm lub valve qia, teeb xim zoo nyob rau ntawm lub hauv paus av valve yog txhua txoj hauv kev los tiv thaiv cov tshuaj corrosive los ntawm yaig covib lub dab tsi uas qhib thiab kaw.
Qhov nce nyob rau hauv huab cua huab cua sov thiab huab cua muaj kuab lom, thiab qhib kev ua haujlwm hauv ib puag ncig, yuav ua kom muaj cua txias rau ib puag ncig kev xeb.
9. Txhim kho cov thev naus laus zis thiab cov qauv valve
Cov tshuaj tiv thaiv corrosion ntawm lubib lub dab tsi uas qhib thiab kawyog ib qho teeb meem uas tau txiav txim siab los ntawm pib ntawm kev tsim, thiab cov qauv tsim qauv yuav tsis muaj qhov cuam tshuam zoo rau kev ua kom qeeb qeeb ntawm lub valve. Yog li no, cov qauv tsim thiab chaw tsim khoom lag luam yuav tsum txhim kho cov txheej txheem tsim qauv thiab yooj yim rau cov qauv tsim nyog hauv cov txheej txheem thiab yooj yim rau cov kev ua kom xeb, yog li hloov kho lawv ntawm kev ua haujlwm.
Lub Sijhawm Post: Jan-22-2025
