Rail Surface Treatment Txheej txheem thiab Corrosion thiab hnav tsis kam
Dab tsi yog cov ntsiab lus tseem ceeb ntawm qhov kub -dip galvanizing txheej txheem rau lub teb chaws tus qauv kev tsheb nqaj hlau?
Cov txheej txheem kub -dip galvanizing ntawm lub teb chaws tus qauv rails yuav tsum nruj me ntsis tswj cov zinc da dej kub thiab lub sij hawm immersion. Lub zinc da dej kub yuav tsum ruaj khov ntawm 440-460 degree, thiab lub sij hawm immersion yuav tsum tswj tsis pub dhau 30-60 vib nas this los xyuas kom meej ib yam adhesion ntawm zinc txheej. Ua ntej galvanizing, rail nto yuav tsum tau muab tshem tawm kom xeb thiab passivation kom tshem tawm oxide nplai thiab impurities thiab txhim kho zinc txheej adhesion. Zinc txheej thickness yuav tsum ncav cuag ntau tshaj 85μm, tsis muaj qhov tsis xws luag xws li plating los yog npuas nyob rau saum npoo, thiab nws yuav tsum dhau 2000-teev ntsev tsuag tshuaj ntsuam tsis pom tseeb xeb. Rau qhov tseem ceeb xws li cov pob qij txha rail, ntxiv plating yuav tsum tau ua los xyuas kom meej tag nrho cov kev tiv thaiv corrosion. Tom qab cov txheej txheem tiav lawm, passivation sealing yuav tsum tau tsim cov yeeb yaj kiab tiv thaiv ntawm zinc txheej txheej, ntxiv dag zog rau kev tiv thaiv corrosion kom hloov mus rau ib puag ncig ntuj ntawm ntau thaj tsam hauv Suav teb.
Dab tsi zoo dua Dacromet txheej txheej txheem txawv teb chaws muaj dua kub -dip galvanizing?
Dacromet txheej txheej txheem txawv teb chaws yog superior rau cov tsoos kub -dip galvanizing txheej txheem nyob rau hauv anti- corrosion thiab mechanical zog. Dacromet txheej siv zinc-aluminium flakes ua cov ntsiab lus tseem ceeb, thiab txheej txheej tuab ntawm tsuas yog 60μm tuaj yeem ua tiav cov nyhuv tiv thaiv -corrosion ntawm 85μm kub-dip galvanizing, tsis muaj hydrogen embrittlement txaus ntshai, ua rau nws haum rau siab - lub zog rail. Nws muaj zog ntsev tsuag tshuaj tiv thaiv, tuaj yeem dhau ntau tshaj 3000 teev ntawm kev ntsuas ntsev tsuag, thiab tsim nyog rau cov ntug dej hiav txwv siab -cov tshuaj tsuag ntsev. Dacromet txheej tau zoo dua siab dua - qhov kub thiab txias thiab tuaj yeem tswj kev ua haujlwm ruaj khov ntawm 250 degree, thaum kub-dip galvanizing yog qhov yooj yim rau zinc txheej txheej saum toj 120℃. Cov txheej kuj muaj cov huab cua tsis zoo, tsis yooj yim rau tawg nyob rau hauv alternating kub thiab tsis kub ib puag ncig, thiab muaj ib tug ruaj khov kev sib txhuam coefficient uas tsis cuam tshuam rau lub installation preload ntawm lub fastening system, yog li nws yog dav siv nyob rau hauv European thiab American tus qauv siab - kawg rails.
Dab tsi yog lub hauv paus ntsiab lus ntawm kev txhim kho kev tsheb ciav hlau los ntawm kev txhaj tshuaj peening ntxiv dag zog rau cov txheej txheem?
Txoj kev txhaj tshuaj peening ntxiv dag zog rau txoj kev txhim kho kev tsheb ciav hlau coj los ntawm kev cuam tshuam cov tsheb ciav hlau nto nrog siab -cov phiaj xwm ceev. Lub projectiles tsoo lub taub hau ntawm txoj kev tsheb ciav hlau ntawm qhov nrawm ntawm 50-80m / s, ua rau cov yas deformation ntawm cov hlau saum npoo, ua haujlwm- txheej tawv tawv nrog lub thickness ntawm 0.1-0.3mm, thiab nce hardness los ntawm 15% -20%. Nyob rau tib lub sij hawm, residual compressive kev nyuaj siab yuav raug generated nyob rau hauv lub nto txheej, offsetting lub tensile kev nyuaj siab tshwm sim los ntawm lub tsheb ciav hlau loads thiab txo qhov pib thiab propagation ntawm qaug zog tawg. Cov txheej txheem no tuaj yeem ua kom zoo dua cov nplej ntawm lub taub hau tsheb ciav hlau, tshem tawm cov teeb meem me me, thiab zam kev hnav thaum ntxov los ntawm kev ntxhov siab. Tom qab kev kho mob, qhov chaw tsheb ciav hlau muaj qhov nruab nrab roughness, uas tuaj yeem txhim kho lub log-rail kev sib cuag lub xeev thiab txo qhov kev sib cuag ntawm tus nqi. Txhaj peening ntxiv dag zog tuaj yeem koom tes nrog cov txheej txheem txheej txheej los txhim kho lub zog sib txuas ntawm cov txheej txheem thiab kev tsheb nqaj hlau thiab txuas ntxiv lub voj voog tiv thaiv tag nrho, uas yog ib qho tseem ceeb ntxiv dag zog rau cov txheej txheem hnyav hnyav.
Vim li cas cov tsheb ciav hlau hauv thaj tsam alpine xav tau ntxiv qis -kub los tiv thaiv- kev kho corrosion?
Qhov qis-kub thiab khov-thaw lub voj voog ib puag ncig hauv thaj chaw alpine yuav ua rau cov tsheb ciav hlau corrosion thiab kev puas tsuaj, yog li cov phiaj xwm qis - kub los tiv thaiv- kev kho corrosion yog yuav tsum tau. Nyob rau hauv qis - qhov kub thiab txias ib puag ncig, cov txheej txheem galvanized zoo ib yam tuaj yeem tawg vim thermal expansion thiab contraction. Tsawg-kub los tiv thaiv- kev kho corrosion yuav ntxiv cov ntsiab lus hauv ntiaj teb tsis tshua muaj rau cov zinc txheej txhawm rau txhim kho nws qhov qis- qhov kub thiab txias thiab tsis txhob tawg tawg. Txias-thaw cycles yuav ua rau rov qab khov thiab thawing ntawm cov dej khov rau ntawm txoj kev tsheb ciav hlau, nkag mus rau hauv txheej txheej thiab ua rau cov txheej txheem tiv thaiv. Tshwj xeeb qis-kub los tiv thaiv- cov coatings muaj zog khov-thaw tsis kam thiab tuaj yeem tiv taus ntau dua 500 khov-thaw cycles yam tsis muaj kev puas tsuaj. Cov dej snowmelt hauv thaj tsam alpine muaj cov ntsev ntau, thiab qis -kub los tiv thaiv- txheej txheej muaj ntsev corrosion zoo dua thiab tuaj yeem tiv taus qhov yaig ntawm cov neeg ua haujlwm snowmelt. Tsis tas li ntawd, kev sib txuas ntawm txoj kab tsheb ciav hlau txheej txheej thiab cov substrate tom qab qis -kub kev kho mob yog nruj dua, thiab nws muaj peev xwm tuav tau zoo adhesion txawm nyob rau ntawm -40 degree, kom ntseeg tau ntev -lub sij hawm los tiv thaiv corrosion.
Cov txheej txheem kev kho tsheb ciav hlau cuam tshuam li cas rau cov nqi kho kab?
Siab - cov txheej txheem kho kom zoo tuaj yeem txo cov nqi kho tom qab ntawm cov kab thiab txuas ntxiv lub voj voog hloov tsheb. Rails kho nrog Dacromet txheej los yog carburizing thiab quenching txheej txheem muaj ib tug kev pab cuam lub neej ntawm 10-15 xyoo, uas yog 2-3 zaug ntawm ib tug zoo tib yam txoj kev uas tsis kho, txo cov khoom siv thiab cov nqi zog ntawm kev hloov ntau zaus. Rails nrog kev tiv thaiv zoo tshaj - kev ua haujlwm corrosion tuaj yeem txo qhov zaus ntawm kev saib xyuas txhua hnub xws li tshem tawm xeb thiab rov ua dua, thiab txo cov haujlwm ua haujlwm ntau dua 30% txhua xyoo. Nto- cov ntsia hlau muaj zog muaj zog hnav tsis kam, uas tuaj yeem txo tus naj npawb ntawm cov tsheb ciav hlau lub taub hau sib tsoo lub sij hawm thiab txo qis peev thiab poob ntawm cov khoom sib tsoo. Yog tias txoj kev kho mob tsis txaus, txoj kev tsheb ciav hlau yuav ua rau xeb thaum ntxov thiab hnav, uas tsis tsuas yog yuav tsum tau hloov ua ntej tab sis kuj tseem tuaj yeem ua rau lub log - kab mob kev tsheb nqaj hlau thiab ua rau cov nqi tuav yuam kev. Kev kho saum npoo zoo tuaj yeem ua tiav "kev nqis peev ib zaug, cov txiaj ntsig mus ntev" thiab ua kom zoo dua qhov kev lag luam tag nrho ntawm txoj kab.