Los tiv thaiv - Corrosion Txheej Txheej Txheej Txheej Txheem rau Bolts thiab Txhim Kho Kev Pabcuam Lub Neej nyob rau hauv qhov chaw ntub dej
Dab tsi yog cov ntsiab lus tsim qauv ntawm peb - txheej txheej txheej txheem ntawm bolt tiv thaiv - txheej txheem txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheem yog dab tsi?
The three-layer structure of the bolt anti-corrosion coating composite process includes a zinc-aluminum coating, a sealing layer and a lubricating layer, each with different functions and requiring close bonding. Cov zinc- txhuas txheej yog cov tub ntxhais tiv thaiv- txheej txheej corrosion, tov nrog zinc hmoov thiab txhuas hmoov ntawm qhov sib piv ntawm 7: 3, coated los ntawm thermal spraying txheej txheem, nrog lub thickness tswj ntawm 80-100μm. Cov nyhuv cathodic tiv thaiv ntawm zinc-aluminium alloy tuaj yeem tiv thaiv lub bolt substrate los ntawm xeb. Cov txheej sealing yog ua los ntawm cov khoom siv epoxy resin nrog lub thickness ntawm 10{14}}15μm, coated rau saum npoo ntawm zinc{17}} txhuas txheej, uas tuaj yeem cais cov dej vapor thiab oxygen thiab tsis txhob oxidation tsis ua haujlwm ntawm zinc- txhuas txheej. Lub lubricating txheej yog ua los ntawm cov khoom siv polytetrafluoroethylene nrog lub thickness ntawm 5-8μm, coated rau ntawm qhov chaw ntawm lub sealing txheej, uas tsis tsuas yog txo cov kev sib txhuam coefficient thaum lub sij hawm bolts zawm tab sis kuj ntxiv txhim kho cov nyhuv anti-corrosion. Tag nrho cov tuab ntawm peb txheej txheej txheej yuav tsum tau tswj ntawm 100-120μm; Cov thickness ntau dhau yuav cuam tshuam cov xov haum qhov tseeb ntawm lub ntsia liaj qhov rooj, thaum lub thickness tsis txaus tsis tuaj yeem ua tiav qhov zoo tshaj plaws los tiv thaiv corrosion. Lub zog sib txuas ntawm cov txheej txheej yuav tsum siab dua lossis sib npaug ntawm 5MPa kom ntseeg tau tias cov txheej yuav tsis poob rau hauv lub sijhawm ntev kev co.
Dab tsi yog qhov kev tiv thaiv-corrosion kev ua tau zoo sib txawv ntawm cov khoom sib xyaw coated bolts thiab ib qho galvanized bolts?
Cov tshuaj tiv thaiv- kev ua haujlwm corrosion sib txawv ntawm cov khoom sib xyaw coated bolts thiab ib qho galvanized bolts yog feem ntau tshwm sim hauv peb yam: ntsev tsuag tshuaj tiv thaiv, kev pabcuam lub neej thiab kev sib txhuam ruaj khov. Cov bolts sib xyaw ua ke tuaj yeem tiv taus cov tshuaj tsuag ntsev rau ntau tshaj 3000 teev yam tsis muaj blistering los yog tev ntawm txheej, thaum lub galvanized bolts tsuas tuaj yeem tiv taus ntsev tsuag li 1000 teev, tom qab uas pom tseeb xeb yuav tshwm sim. Nyob rau hauv qhov chaw ntub dej ballast, kev pabcuam lub neej ntawm cov khoom sib xyaw ua ke tuaj yeem ncav cuag ntau tshaj 20 xyoo, uas yog 2-3 zaug ntawm ib qho galvanized bolts, txo qhov zaus hloov ntawm bolts. Kev sib txhuam coefficient ntawm kev sib xyaw coated bolts yog qhov ruaj khov ntawm 0.12-0.15, thiab qhov sib txawv ntawm qhov kev sib txawv ntawm qhov sib txawv me me, thaum qhov kev sib txhuam coefficient ntawm ib qho galvanized bolts yog yooj yim cuam tshuam los ntawm ib puag ncig cov av noo, nrog rau qhov sib txawv ntawm ntau tshaj 0.05, ua rau tsis ruaj khov preload. Tsis tas li ntawd, qhov sib xyaw coated bolts muaj cov kua qaub thiab alkali zoo dua, thiab tus nqi corrosion nyob rau hauv cov cheeb tsam uas nquag acid los nag tsuas yog 1/5 ntawm ib qho galvanized bolts.
Dab tsi yog qhov yuav tsum tau ua ntawm kev sib xyaw coated bolts rau qhov sib txawv ntawm qhov chaw ntub dej?
Cov kev hloov pauv ntawm cov khoom sib xyaw coated bolts rau qhov sib txawv ntawm qhov chaw ntub dej yog qhov tseem ceeb los kho cov txheej tuab thiab cov khoom sib piv. Cov ntug dej hiav txwv siab -cov av noo ntsev tsuag ib puag ncig muaj qhov muaj zog tshaj plaws corrosion, yuav tsum tau zinc- txhuas txheej thickness yuav tsum tau nce mus rau 100μm, txheej sealing siv ntsev tsuag-resistant phenolic epoxy resin, thiab lub lubricating txheej thickness yuav tsum tau nce mus rau 8μm kom ntseeg tau tias cov ntsev tsuag tshuaj tiv thaiv lub sij hawm yog sib npaug zos rau 30 teev. Lub corrosion nyob rau hauv av noo thiab nag ib puag ncig yog theem nrab; zinc- txhuas txheej thickness yog 80μm, txheej sealing siv cov epoxy resin zoo tib yam, thiab cov txheej lubricating thickness yog 5μm, uas tuaj yeem ua tau raws li qhov yuav tsum tau muaj ntsev tsuag lub sij hawm ntau dua lossis sib npaug li 3000 teev. Qhov chaw nyob hauv av hauv av yog qhov muaj cov av noo siab tab sis tsis muaj hnub ci ncaj qha, xav tau cov txheej txheem sib khi kom ntxiv cov tshuaj fungicide los tiv thaiv pwm kev loj hlob los ntawm kev puas tsuaj rau txheej, thiab zinc- txhuas txheej thickness yog 90μm, ntsuas los tiv thaiv - xeb thiab tiv thaiv - pwm xav tau. Qhov kub tsis tshua muaj nyob rau hauv alpine humid ib puag ncig yuav cuam tshuam rau txheej txheej, yog li 5% npib tsib xee hmoov yuav tsum tau ntxiv rau zinc- txhuas txheej txhawm rau txhim kho qhov qis - kub los tiv thaiv - nkig ua haujlwm ntawm cov txheej thiab zam cov txheej txheem ntawm qhov kub thiab txias.
Dab tsi yog cov txheej txheem tswj cov ntsiab lus tseem ceeb rau kev sib xyaw coated bolts?
Cov txheej txheem tseem ceeb tswj cov ntsiab lus rau kev sib xyaw coated bolts yog concentrated hauv substrate pretreatment thiab txheej curing. Rau substrate pretreatment, lub bolts yuav tsum xub tua- blasted kom tshem tawm cov nto oxide nplai thiab cov roj stains, thiab cov nto roughness yog tswj ntawm Ra1.6-Ra3.2μm kom cov cheeb tsam ntawm lub txheej thiab substrate. Thaum tshav kub txau cov zinc-aluminium txheej, cov tshuaj tsuag yuav tsum tau tswj ntawm 400-450 degree, thiab qhov kev ncua deb ntawm cov tshuaj yog 150-200mm los xyuas kom meej lub txheej yog uniform thiab tsis muaj pores. Tom qab txheej txheej sealing, nws yuav tsum tau kho ntawm 120℃rau 30 feeb kom tag nrho crosslinking epoxy resin thiab txhim kho cov nyhuv sealing. Tom qab txheej txheej lubricating, nws yuav tsum tau kho ntawm 80℃rau 20 feeb kom tsis txhob decomposition ntawm polytetrafluoroethylene vim kub. Tom qab ua tiav, kev ntsuas porosity yuav tsum tau ua, thiab txheej porosity yuav tsum tsawg dua lossis sib npaug li 1%; txwv tsis pub, txheej sealing yuav tsum tau rov ua dua. Tsis tas li ntawd, cov xov ib feem ntawm lub ntsia liaj qhov rooj yuav tsum tau npog los tiv thaiv cov txheej los ntawm clogging cov xov thiab cuam tshuam rau kev sib dhos.
Dab tsi yog qhov ntawm - qhov chaw teeb tsa thiab kev saib xyuas kev ceev faj rau cov khoom sib xyaw ua ke?
Nyob rau ntawm - qhov chaw teeb tsa ntawm cov khoom sib xyaw coated bolts yuav tsum tau tsom mus rau nruj torque thiab txheej tiv thaiv. Ib tug tshwj xeeb torque ciaj ntswj yuav tsum tau siv rau installation, thiab zawm yuav tsum nruj me ntsis raws li tus tsim torque. Lub zog torque ntawm bolts rau siab - kev tsheb ciav hlau ceev yog 350-400N·m, thiab rau hnyav- txoj kev tsheb ciav hlau yog 400-450N·m kom tsis txhob muaj txheej txheej puas vim yog lub zog ntau dhau. Thaum lub sij hawm installation, nws yog txwv tsis pub siv cov cuab yeej nyuaj xws li steel hlau txhuam los ntxuav lub bolt nto kom tsis txhob khawb lub txheej; yog tias muaj plua plav ntawm qhov chaw, nws tuaj yeem so nrog ib daim ntaub huv. Tom qab kev teeb tsa, cov tshuaj tiv thaiv xeb yuav tsum tau siv rau kev sib txuas ntawm lub taub hau ntsia hlau thiab cov txiv ntoo kom cais cov dej vapor ntxiv. Thaum lub sij hawm tu, txheej txheej txheej yuav tsum tau kuaj xyuas tsis tu ncua nrog kev tshuaj xyuas lub voj voog ntawm 1 xyoos. Yog tias qhov chaw me me raug puas tsuaj rau cov txheej, nws tuaj yeem kho nrog tus neeg saib xyuas tshwj xeeb; yog tias qhov chaw puas lawm tshaj 10%, lub ntsia liaj qhov rooj yuav tsum tau hloov nyob rau hauv lub sij hawm. Tsis tas li ntawd, tsis txhob sib cuag ntawm lub ntsia liaj qhov rooj thiab muaj zog acids thiab alkalis los tiv thaiv cov tshuaj corrosion ntawm txheej.