Kev tiv thaiv - cov txheej txheem xeb thiab cov thev naus laus zis txhim kho kom ruaj khov rau kev tsheb ciav hlau spikes
Dab tsi yog cov ntsiab lus tseem ceeb ua haujlwm ntawm kub -dip galvanizing los tiv thaiv- txheej txheem kev xeb rau kev tsheb ciav hlau?
Qhov kub -dip galvanizing los tiv thaiv- corrosion ntawm rail spikes yuav tsum tau ua tib zoo ua ntej - kho cov spikes ua ntej, suav nrog degreasing, pickling, dej ntxuav thiab ziab, kom tsis txhob muaj roj, xeb lossis oxide nplai nyob ntawm qhov chaw. Lub pre-kho rail spikes yuav tsum tau sai sai rau hauv molten zinc tov, thiab qhov kub ntawm cov zinc tov yuav tsum nruj me ntsis tswj ntawm 440{10}}460 degree, uas yuav ua kom zoo metallurgical bonding ntawm zinc txheej thiab spike substrate. Lub sij hawm immersion ntawm rail spikes nyob rau hauv cov zinc tov yuav tsum tau kho raws li cov tuab tuab, feem ntau tswj ntawm 1-3 feeb; Lub sijhawm luv luv yuav ua rau cov zinc txheej nyias dhau, thaum lub sijhawm ntev dhau los yuav yooj yim ua rau zinc txheej tsub zuj zuj. Tom qab galvanizing, txias thiab passivation kev kho mob yuav tsum tau, thiab cov passivation txheej yuav ntxiv txhim kho corrosion kuj ntawm zinc txheej thiab zam dawb xeb tsim. Qhov tsis sib xws ntawm txhua qhov txuas hauv tag nrho cov txheej txheem yuav tsum nruj me ntsis tswj kom ntseeg tau tias lub neej tiv thaiv corrosion ntawm kub-dip galvanized rail spikes tuaj yeem ncav cuag ntau tshaj 15 xyoo.
Dab tsi zoo dua cov txheej txheem sherardizing muaj dua kub -dip galvanizing hauv rail spike anti-corrosion?
Cov txheej txheem sherardizing tso cai rau zinc atoms nkag mus rau hauv txheej txheej ntawm txoj kab tsheb ciav hlau los ntawm qhov siab -kub diffusion, tsim zinc{1}} hlau alloy txheej, uas nws lub zog sib txuas nrog lub substrate ntau dua li lub cev adhesion txheej ntawm kub -dip galvanizing. Lub thickness uniformity ntawm sherardized txheej yog zoo dua; txawm rau qhov nyuaj xws li rail spike threads thiab ces kaum, ib tug nruam thiab ua tiav txheej tiv thaiv yuav tsim, zam lub "exposure" defect uas yog nquag tshwm sim nyob rau hauv kub -dip galvanizing. Kev kho kub ntawm cov txheej txheem sherardizing yog qis dua qhov kub ntawm -dip galvanizing, uas yuav tsis ua rau deformation ntawm rail spike substrate, thiab tuaj yeem tswj tau qhov zoo ntawm qhov raug ntawm cov ntsia hlau loj, tshwj xeeb tshaj yog tsim rau siab - precision threaded rail spikes. Sherardized txheej muaj kev hnav zoo dua; Thaum lub sij hawm kev teeb tsa thiab nruj ntawm txoj kev tsheb ciav hlau, cov txheej txheem tsis yooj yim kom poob, thiab lub sij hawm ntev - tiv thaiv - cov nyhuv corrosion tuaj yeem tswj tau. Tsis tas li ntawd, cov txheej txheem sherardizing muaj zog ib puag ncig tus phooj ywg, ua kom muaj kuab paug tsawg dua hauv cov txheej txheem tsim khoom, thiab ua tau raws li cov kev cai ntawm kev tsim kho ntsuab niaj hnub.
Vim li cas cov txheej txheem dacromet txheej zoo dua rau kev tsheb ciav hlau nyob hauv ntug dej hiav txwv ntsev-alkali thaj chaw?
Cov huab cua nyob rau hauv ntug dej hiav txwv ntsev- thaj chaw alkali muaj cov ntsiab lus ntsev ntau, thiab cov tshuaj chloride ions yuav ua rau kom cov kab mob ntawm cov kab hlau txuas hlau substrate. Qhov kub zoo tib yam -dip galvanized txheej yog yooj yim rau pitting corrosion nyob rau hauv ib puag ncig chloride ion. Lub dacromet txheej yog txheej txheej inorganic tsim los ntawm zinc hmoov, txhuas hmoov thiab binder, uas tuaj yeem tsim cov yeeb yaj kiab tiv thaiv kom zoo los thaiv kev sib cuag ntawm chloride ions thiab rail spike substrate. Cov txheej dacromet muaj cov tshuaj ntsev muaj zog heev corrosion kuj; cov kev ntsuam xyuas qhia tau hais tias nws cov ntsev tsuag tshuaj tiv thaiv lub sij hawm tuaj yeem ncav cuag ntau dua 1000 teev, deb tshaj li 500-teev tus qauv ntawm kub-dip galvanizing. Cov txheej no muaj kev tiv thaiv huab cua zoo heev, tuaj yeem hloov mus rau lub hnub muaj zog, nag thiab kub hloov pauv hauv thaj chaw ntug dej hiav txwv, thiab yuav tsis muaj txheej txheej tawg lossis chalking. Cov txheej dacromet kuj muaj kev ua haujlwm zoo rwb thaiv tsev, uas tuaj yeem tiv thaiv txoj kev tsheb ciav hlau los ntawm kev dhau los ua txoj hauv kev mus rau tam sim no thiab tiv thaiv cov teeb liab khiav los ntawm kev cuam tshuam. Yog li ntawd, nyob rau hauv ntug dej hiav txwv ntsev-alkali ib puag ncig, lub durability ntawm dacromet-coated rail spikes yog 2-3 npaug ntawm lwm cov txheej txheem.
Dab tsi yog txoj hauv kev los ntsuas qhov tuab ntawm rail spike anti-corrosion coatings?
Txoj kev siv ntau tshaj plaws rau kev ntsuam xyuas qhov tuab ntawm rail spike anti-corrosion coatings yog txoj kev sib nqus thickness gauge. Txoj kev no yooj yim rau kev khiav lag luam thiab tsis yog - puas tsuaj, haum rau kev ceev ceev ntawm - qhov chaw sim. Thaum kuaj, tsawg kawg 5 ntsuas cov ntsiab lus yuav tsum raug xaiv ntawm qhov sib txawv ntawm qhov sib txawv ntawm txoj kev tsheb ciav hlau, thiab qhov nruab nrab tus nqi yuav tsum raug coj los ua tus nqi kawg thickness. Rau kev tiv thaiv -corrosion txheej ntawm rail spikes uas tsis yog - sib nqus substrates, eddy tam sim no thickness gauge yuav siv tau, uas xam cov txheej thickness los ntawm kev hloov ntawm eddy tam sim no induction siv thiab kuj yog haum rau nyob rau hauv - qhov chaw kuaj. Rau kev kuaj xyuas qhov tseeb, cov txheej txheem metallographic microscope tuaj yeem siv tau. Tom qab npaj tus ntoo khaub lig- ntu piv txwv ntawm txoj kev tsheb ciav hlau, cov txheej tuab yog ntsuas ncaj qha hauv qab lub tshuab ntsuas, thiab cov qauv no tuaj yeem soj ntsuam lub xeev kev sib raug zoo ntawm cov txheej thiab cov substrate. Txoj kev ntsuas micrometer yog tsim rau kev tsheb ciav hlau spikes nrog tuab txheej. Lub thickness ntawm txheej yog xam los ntawm kev ntsuas qhov sib txawv ntawm qhov sib txawv ntawm txoj kev tsheb ciav hlau ua ntej thiab tom qab galvanizing, tab sis qhov tseeb ntawm txoj kev no yog qhov tsawg. Txawm hais tias siv txoj kev twg los xij, cov qauv tsim nyog yuav tsum tau ua raws li cov ntaub ntawv xeem kom raug thiab txiav txim seb qhov kev tiv thaiv{16}}corrosion txheej puas ua tau raws li tus qauv.
Yuav ua li cas xaiv qhov tsim nyog los tiv thaiv- txheej txheem corrosion raws li daim ntawv thov scenario ntawm rail spikes?
Rau txoj kev tsheb ciav hlau ntawm txoj kev tsheb ciav hlau zoo tib yam hauv thaj chaw hauv av, cov txheej txheem kub -dip galvanizing tuaj yeem ua tau raws li qhov xav tau; cov txheej txheem no muaj tus nqi nruab nrab, thiab cov tshuaj tiv thaiv -corrosion tuaj yeem phim qhov chaw ua haujlwm ntawm kab. Rau rail spikes ntawm hnyav- tsheb ciav hlau, uas muaj kev cuam tshuam ntau dua thiab kev sib txhuam, cov txheej txheem sherardizing yog nyiam; nws lub zog sib txuas siab thiab hnav tsis kam tuaj yeem zam cov txheej txheej thaum lub sijhawm teeb tsa thiab siv. Rail spikes nyob rau hauv ntug dej hiav txwv ntsev- thaj chaw alkali thiab cov av ntub yuav tsum siv cov txheej txheem dacromet los tiv thaiv kev yaig ntawm chloride ions thiab kev cuam tshuam ntawm high - av noo ib puag ncig. Rau rail spikes nyob rau hauv cheeb tsam alpine, nws raug nquahu kom siv cov txheej txheem sib xyaw ntawm kub -dip galvanizing ntxiv rau txheej txheej; lub sealing txheej tuaj yeem tiv thaiv dej los ntawm infiltrating zinc txheej thaum dej khov thiab daus yaj, tsis txhob tawg ntawm zinc txheej ntawm qhov kub thiab txias. Rau rail spikes nyob rau hauv cov kab khiav nrog cov kev cai rwb thaiv tsev, dacromet txheej yog thawj xaiv; nws cov rwb thaiv tsev kev ua tau zoo tuaj yeem ua kom muaj kev ua haujlwm zoo ntawm cov kab hluav taws xob tsis muaj cov khoom thaiv hluav taws xob ntxiv.