Kev xaiv ntawm Corrosion-Resistant Coatings rau Cartridge rhaub nyob rau hauv Strong Acid/Alkali Environments

I. Cov kua qaub thiab cov hauv paus muaj zog npaum li cas corrode cua sov cov ntsiab lus thaum lawv kub

Cov kua qaub muaj zog xws li cov concentrated sulfuric acid, hydrochloric acid, thiab nitric acid, nrog rau cov alkalis muaj zog xws li sodium hydroxide thiab potassium hydroxide, yog corrosive heev rau hlau hauv factories. Cov cua kub uas ua haujlwm nyob rau hauv xws li huab cua yog qhov txaus ntshai ntawm corrosion los ntawm ntau qhov chaw:


1. Tshuaj Corrosion: Cov tshuaj acidic lossis alkaline reacts ncaj qha nrog cov hlau nto, uas tuaj yeem ua rau cov khoom tawg lossis tsim cov khoom xoob xoob. Piv txwv li, hydrochloric acid cuam tshuam nrog cov hlau feem ntau los ua cov chlorides soluble. Thaum kub kub, ntshiab sulfuric acid yog oxidizing heev.

2. Electrochemical Corrosion: impurities los yog me me flaws nyob rau hauv lub qhov cub lub qhov cub yuav ua rau lub zos galvanic hlwb tsim, uas ua rau kom cov txheej txheem ntawm dissolving cov hlau. Hom corrosion no phem tshaj plaws hauv cov tshuaj electrolyte.

3. High-Tsub Accelerated Corrosion: Lub tshuab cua sov lub cua sov ua rau tus nqi corrosion nce. Txhua 10℃kev hloov pauv hauv qhov kub thiab txias tuaj yeem ua rau plaub npaug.

4. Kev ntxhov siab Corrosion Cracking: Thaum qee yam kev tshaj tawm thiab kev ntxhov siab hauv tshuab ua haujlwm ua ke, lawv tuaj yeem ua rau cov ntaub ntawv hlau tawg sai, uas tuaj yeem ua rau lawv tsis ua haujlwm.

Yog li, lub tshuab cua sov cartridge uas yuav siv rau hauv cov xwm txheej hnyav yuav tsum muaj cov txheej txheem tshwj xeeb uas tiv thaiv lawv los ntawm corrosion kom paub tseeb tias lawv ua haujlwm zoo rau lub sijhawm ntev.

II. Cov kev xav tau yooj yim rau txheej txheej uas tiv thaiv corrosion

Kev xeb zoo heev- cov txheej tiv thaiv yuav tsum muaj cov khoom nram qab no kom ua haujlwm zoo hauv cov kua qaub thiab alkali ib puag ncig:

1. Chemical Inertness: Cov khoom siv txheej yuav tsum tsis txhob hnov ​​​​qab nrog cov kua qaub lossis alkali media, kom nws cov khoom siv tshuaj nyob ib yam.

2. Density/Impermeability: The coating must not have any holes or fissures so that the corrosive medium is entirely cut off from the base metal.

3. Thermal Stability: Nws yuav tsum muaj peev xwm tswj tau lub tshuab cua sov qhov kev hloov ntawm qhov kub thiab txias (feem ntau ntawm 300 thiab 500 degree) yam tsis muaj kev tawg lossis sib nrug.

4. Great Adhesion: Cov txheej thiab cov hlau substrate yuav tsum tau sib txuas ua ke zoo heev kom lawv tsis txhob tawg thaum kub hloov.

5. Consistency: Cov txheej yuav tsum yog tib lub thickness nyob ib ncig ntawm, tsis muaj qhov chaw tsis muaj zog.

6. Zoo Thermal Conductivity: Cov txheej yuav tsum tsis txhob ua nyuaj rau lub rhaub kom hloov cov cua sov thaum tseem tiv thaiv nws los ntawm xeb.

III. Txheej cov ntaub ntawv uas ua hauj lwm zoo nyob rau hauv muaj zog acid thiab Alkali chaw

1. Ib txheej ntawm polytetrafluoroethylene (PTFE)

Khoom: Nws yog lub npe hu ua "tus huab tais ntawm plastics" vim nws tuaj yeem tiv taus txhua yam muaj zog acids thiab cov hauv paus. Dav dav ntawm kev khiav hauj lwm kub, los ntawm -200℃mus rau 260 degree. Tsis tshua muaj zog nto ua rau nws nyuaj heev rau tej yam los lo rau nws. Tsawg kev sib txhuam thiab zoo tiv thaiv hnav.

Qhov chaw zoo siv nws yog: qhov chaw uas muaj cov kua qaub loj loj (HCl, H₂SO₄, HNO₃, thiab lwm yam); qhov chaw uas muaj qhov muaj zog alkalis (NaOH, KOH, thiab lwm yam); thiab qhov chaw nrog cov kuab tshuaj organic.

Kev txwv: Nws tsis hloov cov cua sov zoo heev (~ 0.25 W / m·K), uas ua rau nws tsis tshua muaj cua sov. Tej zaum yuav tawg ntawm qhov kub thiab txias, tso cov pa phem. Tsis tshua muaj zog mechanically.

2. FEP (Fluorinated Ethylene Propylene) Txheej

Khoom: Ib qho hloov kho ntawm PTFE uas tseem tiv taus corrosion. Yooj yim ua hauj lwm nrog PTFE, uas ua rau ntau dua coatings. Qhov ntau ntawm kev ua haujlwm yog los ntawm -200℃mus rau 205 degree. High transparency ua rau nws muaj peev xwm saib sab hauv.

Pros: Lub yaj fluidity yog zoo dua li PTFE, uas ua rau coatings uas yog thicker. Zoo dua ua raws li cov hlau nto. Ntau dej-resistant.

3. Txheej nrog polyvinylidene fluoride (PVDF)

Khoom: tuaj yeem tswj qhov kub txog li 150 degree. Muaj zog thiab resistant rau hnav thiab tsim kua muag. Resistant mus rau feem ntau acids, bases, thiab organic solvents. Zoo tiv thaiv UV rays.

Zoo rau: kev teeb tsa nrog cov acids muaj zog lossis cov hauv paus ntawm qhov kub nruab nrab. Cov xwm txheej uas xav tau kev siv zog ntau dua. Qhov chaw sab nraud lossis qhov chaw uas muaj UV rays ntaus.

4. Txheej nrog porcelain enamel (iav)

Khoom: Ib qho inorganic non{0}}hlau txheej nrog tshuaj lom neeg ruaj khov zoo heev. Muaj peev xwm tswj tau qhov kub txog li 450℃+. Ib qho chaw du uas tsis ntsuas. Nyuaj heev thiab resistant rau hnav.

Pros: Heev tiv taus rau muaj zog oxidizing acids, zoo li concentrated sulfuric thiab nitric acid. Tsis cuam tshuam los ntawm qhov kub thiab txias, yog li nws nyob ruaj khov nyob rau lub sijhawm. Lub neej ntev.

Disadvantages: Tsis tuaj yeem ua rau muaj kev cuam tshuam zoo thiab zoo li yuav nti lossis tawg. Nws tsis sawv kub, khaus alkalis thiab hydrofluoric acid. Cov txheej txheem nyuaj dua thiab cov nqi siab dua.

5. Cim Ceramic Txheej

Alumina (Al₂O₃), Zirconia (ZrO₂), Silicon Carbide (SiC), thiab Silicon Nitride (Si₃N₄) yog txhua yam.

Properties: heev resistant rau corrosion thiab yuav luag tag resistant rau feem ntau acids thiab alkalis. tuaj yeem tiv taus qhov kub thiab txias ntawm 1000 degree. High hardness thiab zoo heev hnav tsis kam. Zoo ntawm kev ua cua sov.

Daim ntaub ntawv: Cov kua qaub / alkali muaj zog heev ntawm qhov kub thiab txias heev. Cov xwm txheej uas ua rau hnav thiab tsim kua muag ntau. Cov cuab yeej tseem ceeb uas yuav tsum tau ua kom ruaj khov rau lub sijhawm ntev.

IV. Yam tseem ceeb uas yuav tau xav txog thaum xaiv ib txheej

Thaum xaiv ib qho corrosion- tiv thaiv txheej rau tiag tiag- ntiaj teb siv, koj yuav tsum xav txog tag nrho cov hauv qab no:

1. Cov yam ntxwv nruab nrab: Lub hom thiab tus nqi ntawm cov kua qaub los yog alkali tam sim no, muaj cov oxidizing Cheebtsam, thiab lwm yam corrosive compounds xws li halide ions.

2. Cov xwm txheej kub: qhov ntau ntawm qhov kub thiab txias uas lub cuab yeej tuaj yeem ua haujlwm, ntau npaum li cas thiab qhov kub hloov pauv, thiab muaj feem cuam tshuam rau hauv cheeb tsam overheating.

3. Mechanical Requirements: raug cov kua dej yaig, muaj cov khoom abrasive, thiab muaj kev vibration lossis cuam tshuam.

4. Xav tau kev hloov cua sov: nws ua kom sov zoo npaum li cas; Nws tswj qhov kub thiab txias npaum li cas; Nws teb sai npaum li cas rau cua sov.

5. Cov yam ntxwv ntawm kev lag luam: tus nqi pib, yuav tsum tau tu thiab hloov ntau npaum li cas, thiab tus nqi poob qis.

V. Cov kauj ruam tseem ceeb hauv txheej txheej thov txheej

Tsis muaj teeb meem dab tsi ntawm txheej koj xaiv, nws yog ib qho tseem ceeb kom siv nws kom raug:

1. Pretreatment ntawm lub substrate: ntxuav qhov saum npoo kom zoo kom tshem tau cov roj, oxides, thiab lwm yam kab mob. Yog tias xav tau, roughen qhov chaw (sandblasting, tshuaj etching), thiab kev kho mob passivation.

2. Daim Ntawv Thov Txheej: Kev tswj hwm nruj ntawm ib puag ncig uas siv txheej txheej (kub, av noo, huv si); xyuas kom cov txheej yog tib lub thickness tag nrho; thiab kho cov txheej txheem ntawm ntau- txheej txheej kom zoo.

3. Cov txheej txheem kho: Ua raws li cov khoom siv tshwj xeeb los tswj qhov kub thiab txias profile; xyuas kom muaj sijhawm txaus rau kho; thiab txo qis thermal shock uas tuaj yeem ua rau muaj kev ntxhov siab tawg.

4. Kev Ntsuas Zoo: ntsuas qhov tuab, ntsuas qhov porosity, ntsuas qhov adhesion, thiab ntsuas qhov ntsuas qhov ntsuas hluav taws xob (rau qhov xav tau hluav taws xob rwb thaiv tsev).

VI. Cov lus qhia txog kev xaiv cov txheej txheem rau qee yam xwm txheej

1. Acid/Alkali Environments Hloov: Siv PTFE lossis FEP txheej ua ntej. Xav txog kev siv ntau- txheej txheej txheej txheej txheej. Xyuas kom lub txheej yog kaw tag thiab tsis tuaj yeem tawg.

2. Rau corrosive media nrog cov khoom siv, xaiv ceramic coatings nrog lub siab hardness. Ua kom lub txheej tuab. Xav txog cov kev kho mob uas ua kom tawv nqaij.

3. High -Tub kub Concentrated Acid Environments: Porcelain enamel txheej feem ntau yog qhov kev xaiv zoo tshaj. Es tsis txhob, ntiav ib tug tshwj xeeb hlau substrate nrog ib tug ceramic npog. Nyob deb ntawm cov organic coatings.

4. Muaj zog alkaline daws ntawm qhov kub thiab txias: PVDF txheej ua haujlwm zoo. PTFE txheej uas tau tsim los rau lub hom phiaj no. Qee cov txheej txheem ceramic kuj zoo.

VII. Kev Saib Xyuas thiab Kev Ntsuam Xyuas Lub Neej

Txhawm rau kom paub tseeb tias qhov corrosion- tiv taus txheej kav ntev:

1. Kev tshuaj xyuas tsis tu ncua: Txheeb xyuas qhov saum npoo ntawm cov cim ntawm kev puas tsuaj (xws li tsis muaj xim, blistering, los yog tawg), ntsuas lub thickness ntawm txheej, thiab khiav cov kev ntsuas kev ua tau zoo (xws li insulating resistance).

2. Kev tu ncua sij hawm: Kho qhov chaw me me ntawm kev puas tsuaj tam sim ntawd, tsis txhob khiav lub tshuab thaum nws kub dhau, thiab ua kom nws tsis txhob raug kev puas tsuaj.

3. Kev twv ua ntej lub neej: Txheeb xyuas seb qhov kev pab cuam lub neej tshuav ntau npaum li cas los ntawm kev saib cov nqi corrosion thiab yam uas ua rau kev laus ntawm qhov kub thiab txias; teem caij hloov pauv.

VIII. Txoj Kev Txhim Kho Yav Tom Ntej

Cov thev naus laus zis rau corrosion- cov coatings tiv taus ib txwm tau zoo dua. Nyob rau hauv lub neej yav tom ntej, nws yuav muaj xws li:

1. Nanocomposite Coatings: Siv nanomaterials los hloov thiab txhim kho cov txheej txheem ua haujlwm li cas.

2. Tus kheej-Cov Txheej Txheem Kho: Cov no tuaj yeem kho qhov kev puas tsuaj me me ntawm lawv tus kheej.

3. Cov Txheej Txheem Ntse: Lawv tuaj yeem qhia tau yog tias muaj qee yam corroding thiab muab lus ceeb toom rau koj thaum ntxov.

4. Eco-Cov Txheej Txheem Zoo: Cov txheej txheem no txo ​​qis kev siv cov tshuaj phem thiab kev puas tsuaj rau ib puag ncig.

Kev xav zaum kawg

Xaiv qhov corrosion-cov txheej tiv thaiv rau cov khoom siv hluav taws xob uas yuav siv tau rau hauv cov kua qaub lossis alkali muaj zog yog cuam tshuam ncaj qha rau kev nyab xeeb thiab siv tau ntev ntawm cov khoom siv. Muaj ntau hom txheej txheej, xws li cov organic xws li PTFE, FEP, thiab PVDF, thiab cov khoom tsis zoo xws li cov plooj (porcelain enamel) thiab ceramics. Txhua hom muaj nws tus kheej cov khoom thiab siv. Hauv kev xyaum, kev xaiv yuav tsum coj mus rau hauv tus account ntau yam ntawm cov txheej txheem, xws li cov khoom nruab nrab, qhov kub thiab txias, qhov xav tau ntawm cov tshuab, thiab tus nqi - kev ua tau zoo ntawm cov txheej txheem. Txhawm rau kom paub tseeb tias txheej txheej zoo, kev tswj cov txheej txheem nruj yuav tsum nyob hauv qhov chaw. Raws li cov ntaub ntawv kev tshawb fawb txuas ntxiv txhim kho, peb yuav cia siab tias yuav pom cov qib siab ntxiv -kev ua tau zoo corrosion- cov txheej txheem uas yuav khaws cov khoom siv hluav taws xob cua sov kom zoo dua nyob rau hauv cov xwm txheej hnyav.