Bolt Corrosion Protection Txheej Tshuab thiab Ntev -Kev Paub Txog Kev Tiv Thaiv Lub Sij Hawm
Dab tsi yog cov yam ntxwv ntawm feem ntau siv los tiv thaiv -corrosion txheej thev naus laus zis rau bolts?
Qhov kub-dip galvanizing txheej thickness yog ntau dua los yog sib npaug li 80μm, thiab cov zinc txheej tsim ib daim ntawv cog lus metallurgical nrog lub substrate, nrog rau kev ua haujlwm zoo heev, uas tuaj yeem dhau 1000- teev ntsev tsuag tshuaj tsuag thiab tsim nyog rau cov huab cua puag ncig. Dacromet txheej yog tsim los ntawm zinc- txhuas hmoov thiab binder, nrog lub thickness ntawm 5-12μm, muaj zog corrosion kuj, dhau 2000- teev ntsev tshuaj tsuag, thiab tsis muaj hydrogen embrittlement txaus ntshai, haum rau siab - lub zog bolts. Fluorocarbon txheej siv cov khoom siv polytetrafluoroethylene, nrog lub thickness ntawm 20-30μm, kua qaub thiab alkali tsis kam, UV tsis kam, dhau 3000- teev ntsev tshuaj tsuag, haum rau cov cheeb tsam corrosive heev xws li cov ntug hiav txwv dej thiab thaj chaw muaj kev lag luam. Mechanical galvanizing txheej thickness yog 20-50μm, nrog cov txheej txheem sib xws, haum rau bolts ntawm cov duab nyuaj, me ntsis qis dua cov nyhuv anti-corrosion dua li kub-dip galvanizing, thiab tus nqi nruab nrab. Zinc-nickel alloy txheej muaj 10-15% npib tsib xee, nrog lub thickness ntawm 10-20μm, thiab nws cov corrosion kuj yog 3-5 npaug ntawm kub-dip galvanizing, haum rau hnyav-load thiab high-humidity ib puag ncig.
Vim li cas Dacromet txheej nyiam rau siab - lub zog bolts?
High- lub zog bolts (10.9 qib thiab siab dua) muaj qhov nyuaj siab tom qab kev kho cua sov. Cov txheej txheem kub kub-dip galvanizing yog qhov ua rau hydrogen embrittlement, ua rau bolt puas. Dacromet txheej tsis xav tau pickling, uas tuaj yeem zam qhov kev pheej hmoo ntawm hydrogen embrittlement. Dacromet txheej muaj qhov ua tau zoo heev - qhov kub thiab txias, tswj kev ua haujlwm ruaj khov hauv ib puag ncig qis dua 200 degree, haum rau cov cua sov- qhov chaw xws li cov pob qij txha. Cov txheej muaj zog adhesion rau lub ntsia liaj qhov rooj nto, mus txog qib 1 ntawm GB / T 9286 tus qauv, tsis yooj yim rau poob, thiab muaj peev xwm tiv taus tsheb ciav hlau kev co thiab cuam tshuam. Dacromet txheej muaj lubricity zoo, thiab lub torque coefficient yog ruaj khov thaum txhim kho bolts, zam torque deviation los ntawm txheej shedding. Nws txoj kev tiv thaiv -corrosion lub neej tuaj yeem ncav cuag ntau dua 15 xyoo, ob zaug ntawm cov tsoos kub-dip galvanizing, uas tuaj yeem txo qhov hloov zaus ntawm siab - lub zog bolts.
Yuav ua li cas xaiv cov tshuaj tiv thaiv-corrosion txheej rau bolts hauv ntug hiav txwv?
Cov ntug dej hiav txwv muaj cov ntsev ntsev ntau ntau, yog li fluorocarbon txheej bolts yog qhov nyiam, uas muaj cov ntsev ntsev zoo tshaj plaws tiv thaiv corrosion, tuaj yeem tiv taus dej hiav txwv ntsev yaig, thiab txuas ntxiv kev pab cuam lub neej. Thib ob, zinc-nickel alloy txheej bolts tuaj yeem xaiv, muaj zog corrosion kuj thiab tus nqi qis dua fluorocarbon txheej, haum rau cov ntawv loj -. Yog tias kub-dip galvanizing txheej tau txais yuav, yuav tsum muaj kev kho topcoat ntxiv, nrog rau cov txheej saum toj kawg nkaus ntawm ntau dua lossis sib npaug li 10μm txhawm rau txhim kho cov nyhuv tiv thaiv- corrosion thiab ua rau qhov tsis txaus ntawm kub -dip galvanizing hauv cov tshuaj tsuag ntsev. Cov txheej txheem txheej txheem galvanizing yog txwv tsis pub, vim nws qhov kev tiv thaiv kev tiv thaiv - corrosion tsis txaus los tiv thaiv qhov muaj zog corrosive ib puag ncig hauv cov ntug dej hiav txwv, thiab xeb thaum ntxov yog qhov tshwm sim. Thaum xaiv, nws yog ib qho tsim nyog yuav tsum tau xyuas cov txheej txheem ntsev tsuag tshuaj ntsuam xyuas kom paub tseeb tias nws dhau qhov kev ntsuas ntsev ntsev ntau tshaj 3000 teev thiab ua tau raws li qhov yuav tsum tau siv.
Dab tsi yog cov ntsiab lus tseem ceeb ntawm kev tsim kho kom zoo rau bolt txheej?
Ua ntej txheej, ntsia liaj qhov rooj saum npoo yuav tsum tau ntxuav kom huv si kom tshem tawm cov roj, xeb thiab oxide nplai. Sandblasting yog siv los ua kom lub ntsej muag roughness ncav cuag Ra2.5-5μm los txhim kho txheej adhesion. Cov txheej txheem kub{11}}dip galvanizing yuav tsum tswj cov zinc kua kub ntawm 440-460℃thiab zinc dipping lub sij hawm ntawm 3-5 feeb kom tsis txhob bolt kev ua tau zoo degradation vim kub dhau. Dacromet txheej txheej yuav tsum xyuas kom meej daim ntawv thov, tsis txhob plam txheej thiab sagging, thiab ziab kub yog tswj ntawm 200-220℃los xyuas kom meej kho tiav ntawm txheej. Fluorocarbon txheej yuav tsum tau txais cov txheej txheem electrostatic txau, nrog rau kev txau siab ntawm 0.3-0.5MPa kom ntseeg tau tias cov txheej txheej tuab tsis muaj pinholes thiab npuas. Tom qab txheej txheej, adhesion thiab thickness kuaj yuav tsum tau nqa tawm; adhesion yog kuaj los ntawm txoj kev hla-txiav, thiab thickness yog ntsuas los ntawm txheej thickness gauge. Cov khoom tsis tsim nyog yuav tsum tau rov ua dua.
Yuav ntsuas qhov ntev - lub sij hawm tiv thaiv ntawm bolt txheej?
Kev ntsuam xyuas ntsev yog qhov kev ntsuas tseem ceeb. Lub nruab nrab ntsev tsuag tshuaj tsuag chamber yog siv los simulate qhov corrosive ib puag ncig, sau lub sij hawm thaum xeb tshwm nyob rau hauv txheej, thiab ntau tshaj los yog sib npaug rau 2000 teev yog tsim nyog rau lub sij hawm ntev - tiv thaiv. Qhov ntawm - qhov kev xeem daim coupon no yuav tsum tau dai cov qauv bolt hauv qhov chaw pabcuam tiag tiag, soj ntsuam qhov xwm txheej xeb tsis tu ncua, sim ib xyoos ib zaug rau 5 xyoo sib law liag, thiab ntsuas qhov kev siv tiag tiag. Cov txheej txheej hnav simulates lub bolt installation thiab disassembly txheej txheem, ntsuas cov txheej hnav poob, thiab Tsawg dua los yog sib npaug li 5μm / lub sij hawm tsim nyog los xyuas kom meej tias cov kev tiv thaiv corrosion tuaj yeem tswj tau tom qab ntau yam kev sib tsoo thiab sib dhos. Electrochemical kuaj ntsuas qhov corrosion tam sim no ceev los ntawm kev ntsuas lub polarization nkhaus ntawm txheej; qhov me dua qhov ceev tam sim no, qhov zoo dua rau kev tiv thaiv-corrosion nyhuv. Ntev- lub sij hawm taug qab ntawm cov kev pab cuam ntawm cov ntsia hlau ntsia, sau lub sij hawm thaum xeb tshwm, thiab suav qhov nruab nrab lub neej kev pab cuam, raws li lub hauv paus ncaj qha rau lub sij hawm ntev - tiv thaiv cov nyhuv ntawm txheej.