E-Coating yog dab tsi?

Thawj zaug peb pab neeg tsim vaj tsev tau qhib lub corroded roj teeb tais rov qab los ntawm ib tug ntug dej hiav txwv faib chaw nyob rau sab hnub tuaj Asia, tus qauv tsis ua hauj lwm qhia peb txhua yam peb xav paub. Cov tshuaj tsuag ntsev tau nkag mus los ntawm qhov tsis xws luag nyob ze ntawm lub vuam seam, thiab nyob rau hauv yim lub hlis cov hlau substrate tau pom cov xeb los ntshav los ntawm qhov yuav tsum yog kaum- xyoo txheej txheej. Qhov xwm txheej ntawd tau hloov pauv li cas peb hais txog kev tiv thaiv saum npoo rau txhua qhov thaiv hlau tawm hauv peb qhov chaw.

Electrocoating-e- txheej rau luv- ua haujlwm ntawm lub hauv paus ntsiab lus uas tseem xav tias yuav luag zoo nkauj heev tom qab koj nkag siab nws. Submerge ib feem ntawm cov dej hauv da dej uas muaj cov xim pleev xim, siv DC voltage, thiab cov khoom ntawd txav los ntawm cov kua thiab tso lawv tus kheej mus rau txhua qhov chaw tam sim no tuaj yeem ncav cuag. Lub physics yog ncaj nraim: opposite nqi nyiam. Tab sis kev tsim vaj tsev tsim nyog los ua qhov haujlwm no ntawm kev tsim khoom suav nrog chemistry, dej dynamics, thiab kev tswj cov txheej txheem uas coj kev lag luam tsheb ntau xyoo los kho kom zoo.

Electrochemistry Tom Qab Kev Tsim Yeeb Yam

Thaum cov hluav taws xob ncaj qha dhau los ntawm txheej da dej, plaub qhov xwm txheej tshwm sim ib txhij. Electrophoresis txav cov khoom siv hluav taws xob thiab cov xim xim mus rau qhov chaw ua haujlwm. Electrodeposition ua rau cov khoom no poob lawv cov nqi thiab precipitate ua ib zaj duab xis coherent. Electrolysis tsim hydrogen ntawm cathode thiab oxygen ntawm anode. Electroosmosis quab yuam cov dej molecules tawm ntawm cov txheej txheem tshiab, densifying zaj duab xis ua ntej nws txawm tawm hauv lub tank.

Qhov tshwm sim yog txheej txheej uas qhwv ib ncig ntawm ntug, nkag mus rau hauv qhov chaw so, thiab ua rau tus kheej - txwv thickness txiav txim siab los ntawm hluav taws xob tsis kam ntawm cov yeeb yaj kiab tso. Thaum cov txheej txheej ncav cuag ib lub thickness, nws insulates lub nto txaus uas tam sim no ntws tee thiab deposition nres. Qhov no tus kheej - txwv kev coj cwj pwm piav qhia vim li cas e- txheej tsim cov yeeb yaj kiab zoo tshaj plaws nyob rau hauv cov geometries nyuaj- tej yam tshuaj tsuag tsis tuaj yeem sib phim rau ntawm qhov chaw nrog cov kab noj hniav thiab cov ces kaum nruj.

Rau steel roj teeb vaj tsev nyob uas yuav siv lawv lub neej kev pab cuam rau txoj kev ntsev thiab av av caij tsheb kauj vab, qhov kev sib txawv no tseem ceeb. Anodic e-txheej txheej tseem muaj cov ntawv thov- qis kho qhov kub thiab txias ua haujlwm zoo dua rau cov cua sov-sensitive assemblies-tab sis lithium roj teeb enclosure ua haujlwm nrog tus qauv txias-rolled steel yuav luag universally qhia cathodic epoxy primers.

Dab tsi tshwm sim hauv Tank

Cov txheej da dej zoo li yooj yim deceptively: 80-90 feem pua ​​​​ntawm cov dej deionized nqa 10-20 feem pua ​​​​cov xim khib nyiab nyob rau hauv tas li agitation. Tab sis kev tswj hwm tus da dej hauv kev tsim khoom yuav tsum tau saib xyuas txhua hnub rau ntau qhov kev cuam tshuam tsis sib xws. Solids cov ntsiab lus drifts raws li cov khoom tso rau ntawm qhov chaw. pH hloov raws li acid byproducts accumulates. Conductivity hloov nrog kev sib kis los ntawm kev rub tawm thiab cov khoom tawg. Kub muaj feem xyuam rau viscosity thiab deposition tus nqi.

Cov Hom Phiaj Txheej Txheem

• 18-20 feem pua ​​​​ntawm cov khoom
• pH ntawm 5.9 txog 6.3
• Kev ua haujlwm siab: 1100-1500 µS / cm
• Kub: 28-32 ° C

Peb cov txheej txheem engineers tsom 18-20 feem pua ​​​​cov khib nyiab, pH ntawm 5.9 thiab 6.3, conductivity ntawm 1100 txog 1500 microsiemens ib centimeter, thiab da dej kub ntawm 28-32 degrees Celsius. Cov kab no yog los ntawm cov txheej txheem cov khoom lag luam uas tau ua tiav los ntawm ntau xyoo ntawm kev tsim tsheb. Deviating los ntawm lawv tsis tas yuav ua rau tsis ua hauj lwm tam sim ntawd, tab sis nws hloov lub qhov rais txheej txheem thiab ua rau muaj kev sib txawv ntawm cov yeeb yaj kiab tsim, zoo li, thiab kev ua haujlwm corrosion.

Daim ntawv thov hluav taws xob yuav tsum muaj kev tswj xyuas qhov chaw. Kev tsoo lub workpiece nrog tag nrho qhov hluav taws xob tam sim no ua rau tam sim no tsom rau ntawm cov npoo ntse thiab nyias qhov chaw, uas muaj feem cuam tshuam rau cov yeeb yaj kiab tso tawm thiab tsim cov pinholes uas tua cov tais roj teeb nyob rau sab hnub tuaj Asia. Ib kaum mus rau kaum tsib thib ob ramp mus rau kev ua hauj lwm voltage ntawm 150 thiab 350 volts tso cai rau tam sim no faib kom sib npaug ntawm qhov chaw. Lub sijhawm immersion ntawm 120-180 vib nas this muab cov yeeb yaj kiab tsim kom tsim nyog yam tsis muaj kev pov tseg ntawm cov voj voog txuas ntxiv.

Kev sib raug zoo coulombic-kwv yees li 1.2 txog 1.4 coulombs ib square centimeter tso nyiaj ib micrometer ntawm zaj duab xis- muab cov pab pawg tsim khoom ua haujlwm rau kev tswj cov txheej txheem. Yog hais tias qhov chaw tawm nyias, xyuas cov zis rectifier. Yog hais tias thickness txawv nyob rau hauv lub load, soj ntsuam electrode tso thiab da dej ncig.

Pretreatment txiav txim txhua yam

Ntawm no yog qhov tsis xis nyob qhov tseeb txog electrocoating: lub e-coat nws tus kheej tsis tshua ua rau qhov ua tsis tiav. Pretreatment ua. Txhua qhov teeb meem corrosion peb tau taug qab rov qab los ntawm peb cov khoom siv khoom siv los ntawm kev tu tsis zoo, phosphating tsis raug, lossis kev sib kis ntawm cov txheej txheem.

Steel substrates yuav tsum tau degreasing kom tshem tawm cov roj stamping thiab tuav cov av uas tiv thaiv kev sib txuas tshuaj. Ultrasonic tu ntawm 60 degrees Celsius rau peb feeb ua raws li siab - cov tshuaj tsuag txau ntawm 0.3 megapascals tshem tawm cov kab mob feem ntau. Tab sis "feem ntau" tsis zoo txaus rau qhov chaw uas yuav tsum muaj sia nyob 1000 teev ntawm kev ntsuas ntsev ntsev.

Phosphate conversion txheej tsim lub microscopic crystalline qauv uas anchors cov organic zaj duab xis rau hlau. Zinc phosphate systems tsom rau 2-4 grams ib square meter nrog siv lead ua loj hauv qab 5 micrometers tau dhau los ua tus qauv tsheb. Cov muaju muab cov neeg kho tshuab sib cuam tshuam thaum lub phosphate txheej ntxiv nws tus kheej corrosion inhibition. Hla cov kauj ruam no lossis khiav nws tsis zoo, thiab txawm tias lub tsho zoo nkauj e-coat yuav delaminate thaum corrosion pib ntawm lub interface.

Qhov kawg yaug ua ntej electrocoating yuav tsum coj nto conductivity qis dua 10 microsiemens ib centimeter. Kev ua tau zoo dua ua rau tsis sib xws tam sim no nyob rau hauv e-coat tank thiab ua rau cov dej ntws thiab cov cim ntws uas cov neeg soj ntsuam zoo tsis kam pom.

Cov cuab yeej siv tiag tiag

Tank tsim raws li cov khoom raug coated. Rectangular tanks haum indexing systems qhov twg loads nyob ntawm qhov chaw ruaj. Nkoj- zoo li lub tso tsheb hlau luam nrog ramped nkag thiab tawm seem ua kom haum rau cov khoom siv hluav taws xob txuas ntxiv. Sab hauv sab hauv yuav tsum tau iav -fiber- rov qab cov yas rwb thaiv tsev rau 20,000 volts los tiv thaiv cov xau tam sim no thiab xyuas kom cov hluav taws xob ua kom pom tseeb ntawm cov khoom ua haujlwm ntau dua li cov phab ntsa tank.

Cov tshuab hluav taws xob khiav tsis tu ncua- kaw lawv rau ntau tshaj ob teev thiab cov khib nyiab pib nyob rau hauv qab. Cov twj tso kua mis loj rau peb mus rau plaub qhov kev hloov pauv ib teev ua kom muaj kev sib faib ua homogeneous. Hauv qab velocities saum 0.4 meters ib ob tiv thaiv qhov chaw tuag uas hnyav pigment hais.

Ultrafiltration systems extract permeate-qhov tseem ceeb ntawm cov dej huv nrog cov kuab tshuaj uas tsis muaj molecular hnyav-los ntawm da dej rau kev siv tom qab- yaug theem. Lub voj kaw no rov qab tau kwv yees li 80 feem pua ​​​​ntawm cov khoom rub tawm ntawm qhov chaw, txo cov nqi raw khoom thiab kev kho dej khib nyiab. Ua haujlwm nrog cov neeg muag khoom uas xav tau lub tsho loj ntawm thaj chaw ntawm cov npoo nruj, qhov kev rov qab ua haujlwm tau ncaj qha cuam tshuam rau kev lag luam tsim khoom.

Lub tshuab anode tsim nyog tau txais kev saib xyuas ntau dua li qhov nws tau txais. Semi-permeable daim nyias nyias nyob ib puag ncig cov anodes tso cai rau ionic byproducts hla thaum khaws cov resin thiab pigment. Cov kua dej anolyte acidifies thaum ntau lawm; conductivity tswj systems los ntshav tawm concentrated anolyte thiab hloov nws nrog deionized dej kom tswj ionic tshuav nyiaj li cas. Tsis saib xyuas qhov Circuit Court no thiab da dej chemistry drifts kom txog rau thaum txheej zoo ua unpredictable.

Kuaj Qhov Teeb Meem

Cov tshuaj tsuag ntsev raug rau ib qho ASTM B117 tseem yog tus qauv nrawm nrawm nrawm txawm tias nws tau lees paub cov kev txwv. Kev sim ib puag ncig-5 feem pua ​​​​sodium chloride tov ntawm 35 degrees Celsius nrog cov huab cua tsis tu ncua- ua kom corrosion tab sis tsis rov ua dua qhov ntub-qhuav kev caij tsheb kauj vab, qhov kub thiab txias excursions, thiab kis kab mob uas qhov chaw ua haujlwm hauv kev pabcuam tiag tiag.

Rau cathodic epoxy primers tshaj phosphated steel ntawm 20-35 micrometers qhuav zaj duab xis thickness, specifications feem ntau yuav tsum tau 1000 teev yam tsawg kawg nkaus raug nrog script creep txwv rau 2 millimeters ib sab.Kev cai roj teeb vaj tsev neeg muag khoomfeem ntau thawb qhov no mus rau 1500 teev thaum ua ke nrog zinc-nickel plating ntawm lub substrate. Cyclic corrosion testing uas suav nrog ntsev tsuag, av ntub dej, qhuav -tawm, thiab khov cycles muab kev sib raug zoo dua rau kev ua haujlwm hauv teb tab sis siv sijhawm ntev dua thiab raug nqi ntau dua.

Hla -hatch adhesion testing per ASTM D3359 catches pretreatment fails before they become field problems. Kev cuam tshuam tsis zoo ntawm 50 centimeter-kilograms paub meej tias cov yeeb yaj kiab tuaj yeem muaj sia nyob ntawm cov khoom siv kho tshuab uas tshwm sim thaum lub sijhawm sib dhos roj teeb. Pencil hardness ntawm 2H los yog ntau dua qhia tau hais tias ua tiav kev kho- cov yeeb yaj kiab hauv qab zoo li nyuaj tab sis tseem muaj tshuaj lom neeg thiab degrade sai dua nyob rau hauv ib puag ncig raug.

Kev saib xyuas da dej txhua hnub taug qab qhov tsis zoo uas kwv yees cov txheej txheem zoo: cov ntsiab lus khib nyiab, xim - rau -binder ratio, pH, conductivity, neutralization sib npaug. Thaum ib qho ntawm cov drift sab nraud specification, cov txheej txheem engineers tshawb xyuas ua ntej khiav ntau lawm. Tos rau kev soj ntsuam zoo kom ntes cov teeb meem pov tseg cov khoom siv thiab lub peev xwm thaum muaj kev pheej hmoo rau cov neeg xa khoom xa tuaj.

Qhov twg Technology no muab tus nqi tiag

Kev lag luam automotive tsav e-txheej txheej txheej vim tias tsis muaj lwm yam thev naus laus zis tuaj yeem sib xyaw ua ke lub thawv ntu, hem flanges, thiab qhov chaw -welded pob qij txha uas ua rau lub tsheb lub cev qauv. Tib lub peev xwm txhais tau ncaj qha rau cov roj teeb ntim rau cov tsheb fais fab.

Cov tais roj teeb steel ntsib txoj kev tshuaj tsuag, de- cov tshuaj icing, cov av noo caij tsheb kauj vab, thiab qee zaus pob zeb cuam tshuam thoob plaws hauv lawv lub neej ua haujlwm. Cov txheej txheem tiv thaiv corrosion yuav tsum muaj sia nyob 15 xyoo lossis 150,000 mais hauv qhov kev ua haujlwm hnyav tshaj plaws -xav tias txoj kev loj hauv Scandinavia lossis txoj kev ntug hiav txwv hauv huab cua sov. E- txheej muab txheej txheej txheej uas tiv thaiv corrosion pib ntawm weld seams, laser- txiav npoo, thiab tsim cov ces kaum uas yuav plam lossis tsis txaus los ntawm kev siv tshuaj tsuag.

Peb pab neeg muaj coated steel enclosures xws li los ntawm me me 48V modules nyob rau tag nrho - loj traction roj teeb tais ntau tshaj ob square meters ntawm qhov chaw. Qhov cuam tshuam lub zog zoo ntawm electrocoating yuav pom tseeb thaum koj sim tshuaj tsuag xim rau sab hauv ntawm lub thawv kaw. Txawm hais tias koj tso nws liab qab thiab cia siab tias nws yuav tsis pom cov dej noo, lossis koj tho qhov nkag uas tsim qhov chaw pib corrosion ntxiv. E- txheej nkag mus rau hauv txhua qhov kab noj hniav uas lub da dej tuaj yeem sau tau, muab kev tiv thaiv ua tiav yam tsis muaj kev cuam tshuam txog kev tsim qauv.

Tsawg-kub kho formulations hais txog lub tshav kub rhiab heev ntawm assembled modules sawv cev rau ib tug tseem ceeb txoj kev loj hlob rauLithium roj teeb pob manufacturersleej twg yuav tsum tau siv cov txheej txheem tiv thaiv tom qab kev teeb tsa ntawm tes. Txheem e-cov txheej txheem txheej txheem kho ntawm 170 degrees Celsius rau 20 feeb-qhov kub uas yuav ua rau cov hlwb thiab cov khoom siv hluav taws xob puas. Tsawg- ci lwm txoj hauv kev kho ntawm 140 degrees rau 15 feeb txi qee qhov kev ua tau zoo tshaj plaws tab sis tseem tsim nyog rau ntau daim ntawv thov uas cov txheej txheem sib tw txwv tsis pub muaj cua sov.

Tswv yim txwv thiab Tradeoffs

Kev xaiv xim yog txwv piv rau cov hmoov txheej los yog kua xim. Feem ntau e-coat systems khiav dub lossis grey primers; hloov xim yuav tsum tau ntxuav lub tank uas yuav siv sij hawm hnub thiab pov tseg cov khoom. Qee qhov chaw ua haujlwm ntau lub tso tsheb hlau luam rau cov xim sib txawv, tab sis qhov no ua rau cov peev thiab cov chaw hauv pem teb.

Txoj kev kho yuav txwv tsis pub xaiv substrate. Cov khoom uas tsis tuaj yeem tiv taus 140-175 degrees Celsius rau lub voj voog kho- tej yam yas, ua ntej- cov khoom sib dhos nrog qhov kub thiab txias- cov ntsiab lus rhiab, qhov chaw nrog nias- haum bearings-xav tau lwm txoj kev txheej txheej. Anodic e-coat systems muab kev kho mob qis dua tab sis txi kev ua haujlwm corrosion.

Kev ua raws li ib puag ncig tau ua ncaj nraim piv rau cov kuab tshuaj-raws li cov tshuaj tsuag. E-cov khaub ncaws da dej muaj cov khoom siv hluav taws xob tsawg tsawg, ua tau raws li EPA thiab CARB qhov yuav tsum tau ua yam tsis muaj cov khoom siv tiv thaiv emission. Lub kaw - lub voj kaw kaw kom txo cov dej siv thiab cov dej pov tseg. Tab sis lub da dej nws tus kheej yuav tsum tau ceev faj tswj-siv anolyte xav tau neutralization, ultrafiltration membranes yuav tsum tau muab pov tseg tom qab 18-36 lub hlis ntawm kev pab, thiab phosphate sludge los ntawm pretreatment muaj cov hlau tswj.

Thaum Outsourcing Makes Sense

NtauLithium hlau phosphate roj teeb lwm tus neegthiab enclosure fabricators outsource electrocoating rau cov khw ua hauj lwm tshwj xeeb es tsis nqis peev rau cov khoom raug ntes. Qhov no ua rau kev nkag siab txog kev lag luam thaum cov khoom ntim ntau tsis ua rau muaj peev xwm ua tau zoo, thaum ntau cov txheej txheem txheej txheem xav tau kev hloov pauv uas ib leeg - cov kab hom phiaj tsis tuaj yeem muab tau, lossis thaum cov kws tshaj lij rau kev tswj hwm da dej thiab kev tswj hwm zoo poob rau sab nraud cov peev txheej.

Kev lag luam tawm yog kev pheej hmoo ntawm cov khoom siv. Txheej txhuas lub sij hawm ntxiv hnub rau cov sij hawm tsim khoom. Kev ua tau zoo nyob ntawm lub khw txoj haujlwm kev qhuab qhia ntau dua li kev tswj hwm sab hauv. Kev thauj mus los ntawm cov khoom tsim thiab txheej txheej ntxiv tus nqi thiab tuav raug.

Peb txoj hauv kev tau ua kom tsim nyog rau ntau qhov chaw txheej txheej, muab cov ncauj lus kom ntxaws qhia txog cov txheej txheem thiab cov kev xeem uas tau piav qhia saum toj no, thiab tshawb xyuas cov khoom zoo ntawm txhua qhov khoom xa tuaj. Thaum peb pom cov teeb meem, peb taug qab lawv rov qab los ntawm txheej txheej txheej txheem los txheeb xyuas cov hauv paus hauv paus es tsis yog tsuas yog tsis lees paub qhov chaw. Qhov kev sib koom tes no tau txhim kho qhov zoo ntawm peb cov neeg muab txheej txheej thaum muab peb qhov hloov pauv hloov pauv raws li qhov xav tau hloov pauv.

E- txheej thev naus laus zis tau txais nws txoj haujlwm ua cov txheej txheem tseem ceeb rau kev tiv thaiv corrosion ntawm steel substrates. Kev sib xyaw ua ke ntawm cov khoom siv sib xws, kev tswj cov yeeb yaj kiab, kev ua raws li ib puag ncig, thiab kev tsim khoom ua haujlwm ua rau nws muaj kev xaiv pom tseeb rau cov khoom siv roj teeb thiab cov khoom siv uas yuav tsum tau ua kom ntev ntev -lub sij hawm ua haujlwm nyob rau hauv qhov chaw ua haujlwm hnyav. Kev nkag siab txog cov txheej txheem tsis zoo, cov kev xav tau zoo, thiab cov kev txwv tsis pub siv ua haujlwm pab pawg engineering qhia cov txheej txheem txheej txheem uas ua rau muaj kev ntseeg tau zoo dua li kev cia siab tias cov lus hais dav dav yuav ua rau cov txiaj ntsig tau txais txiaj ntsig.