Vim li cas Fishplate Corrosion yog ib qho teeb meem sib koom ua ke
Lub phaj phaj (chaw sib koom ua ke) yog bolted tiv thaiv lub vev xaib kev tsheb nqaj hlau thiab nqa cov khoom khoov ntawm qhov sib koom ua ke. Corrosion tawm tsam nws nyob rau hauv ob txoj kev: seem poob txo qhov load -nrog cheeb tsam, thiab pitting tsim kev ntxhov siab los ntawm qhov qaug zog tawg pib. Vim tias cov phaj ntses tau kuaj xyuas tsawg dua li qhov chaw khiav, kev puas tsuaj corrosion feem ntau pom tsuas yog thaum nws twb mob hnyav heev. Cov txheej txheem tiv thaiv yuav tsum yog li tsim los rau ib puag ncig tshwj xeeb ntawm cov kab, thiab cov kev lees paub yuav tsum tau txheeb xyuas cov qib tiv thaiv tiag tiag es tsis yog tsuas yog cov xim txheej txheej.
Cov kab ntug hiav txwv: ntsev tsuag tshuaj tiv thaiv
Cov tshuaj tsuag ntsev yog qhov tseem ceeb ntawm kev txhim kho corrosion nyob rau hauv ob peb kilometers ntawm hiav txwv. Cov txheej txheem txheej txheem yog kev sib xyaw ntawm kub-dip galvanizing ntawm 120-150 microns, passivation zaj duab xis ntawm 1-2 microns kom tsis txhob xeb dawb, thiab 30-40 micron fluorocarbon topcoat nrog ntsev tsuag tiv taus siab tshaj 2000 teev. Ua ntej txheej, lub phaj saum npoo yog txhaj-blasted mus rau ib tug roughness nyob ib ncig ntawm Ra 50-80 microns yog li cov zinc txheej thiab xim tseem ceeb mechanically. Fluororubber sealing rings yog haum rau ntawm lub qhov ntsia liaj qhov rooj kom cov dej ntsev tsis tuaj yeem nkag mus tom qab lub taub hau. Nrog rau cov txheej txheem no, cov ntses ntses ntawm cov kab ntug hiav txwv yuav tsum kav ntev dua 8 xyoo yam tsis muaj kev cuam tshuam loj.
Saline-Alkali Areas thiab Chemical Corrosion
Hauv cov dej qab ntsev- thaj av alkali cov xov xwm tawm tsam yog cov kua qaub thiab alkaline ntsev nqa los ntawm dej hauv av thiab txaws. Ob qho kev ntsuas ua ke: kev txhim kho cov khoom siv thiab kev tiv thaiv saum npoo. Weathering steel uas muaj tooj liab thiab chromium raug xaiv; nws tus nqi corrosion nyob rau hauv saline -alkali ib puag ncig yuav tsum nyob ntawm lossis qis dua 0.05 mm ib xyoos twg. Qhov saum npoo siv ob- txheej txheej txheej ntawm epoxy zinc- nplua nuj primer ntawm 50-60 microns, nrog zinc hmoov cov ntsiab lus siab tshaj 80 feem pua rau kev tiv thaiv kev txi, thiab 40-50 micron polyurethane topcoat nrog acid thiab alkali tsis kam. Welded pob qij txha yog cov av yaug ua ntej pleev xim kom lub vuam seam tsis dhau los ua thawj qhov chaw corrosion, qhov chaw tiaj tus yog khaws cia li ntawm 0.5 hli hauv ib lub 'meter' kom tsis txhob muaj txheej txheej tawg nyob rau hauv kev ntxhov siab, thiab cov coatings raug tshuaj xyuas txhua txhua rau lub hlis nrog kev sib chwv sai ntawm kev puas tsuaj.
Hnyav-Load Lines: Strength and Corrosion together
Hnyav- cov pob qij txha nqa ob qho tib si corrosion thiab siab heev txhua yam loads, yog li cov tshuaj yuav tsum tiv thaiv tsis muaj zog. Cov khoom siv yog 40CrNiMoA siab- lub zog steel nrog lub zog tensile ntawm tsawg kawg yog 1080 MPa tom qab tempering, ua ke nrog zinc diffusion txheej ntawm 50-80 microns uas tsim ib daim ntawv cog lus metallurgical nrog cov hlau, nrog lub zog sib zog siab tshaj 300 MPa yog li nws tsis tev nyob rau hauv flexure. Cov cheeb tsam kev ntxhov siab yog sib npaug mus rau 8 hli vojvoog kom txo tau qhov kev pheej hmoo ntawm kev ntxhov siab corrosion tawg. Sulfur thiab phosphorus raug txwv rau 0.025 feem pua ntawm txhua tus kom muaj kev tiv thaiv corrosion tsawg, thiab PTFE anti-corrosion gaskets haum rau ntawm lub ntsej muag ntawm lub phaj thiab tsheb ciav hlau kom tawg ob peb electrochemical.
High-Altitude Cold Regions: De-Icing ntsev thiab khov-Thaw
Nyob rau hauv roob thiab toj siab kab cov neeg tsav tsheb corrosion yog de-icing agents thiab khov-thaw cycling, ua ke nrog tsawg-kub brittleness. Cov khoom siv yog Q355E qis-kub cov qauv hlau nrog lub zog cuam tshuam tsawg kawg 34 J ntawm rho tawm 40 C, uas muab ob qho tib si toughness thiab corrosion kuj. Qhov saum npoo siv kub-dip galvanizing saum 100 microns ntxiv rau qhov qis-kub tiv thaiv kab mob ntawm 20-30 microns nrog qhov chaw khov qis qis dua 50 C, yog li dej khov thiab daus tsis khi rau lub phaj thiab de-icing ntsev yog khaws cia deb ntawm cov hlau. Bolt qhov yog chamfered mus rau ib tug 5 hli vojvoog los tiv thaiv Frost heave puas, thiab lub qhov chaw kam rau ua yog ntxiv los yog rho tawm 0.3 hli yog li ntawd bolts haum nruj nreem thiab tawm tsis muaj txoj kev rau corrosive xov xwm. Cov tshuaj tiv thaiv yog rov siv dua ua ntej txhua lub caij ntuj no.
Test Indicators and Methods
| Kuaj | Txoj kev | Txais |
|---|---|---|
| ntsev tsuag kuj | Neutral ntsev tsuag, 5 feem pua NaCl ntawm 35 C, 1000 teev | Corrosion cheeb tsam hauv qab 5 feem pua |
| Acid thiab alkali tsis kam | Immersion hauv 5 feem pua HCl thiab 5 feem pua NaOH, 100 teev | Qhov hnyav poob qis dua 1 feem pua |
| Electrochemical corrosion tus nqi | Corrosion tam sim no ceev ntsuas | Hauv qab no 10 microA / cm2 |
| Txheej adhesion | Hla- txiav kev xeem, 1 hli sib nrug, daim kab xev tev | Peeled cheeb tsam hauv qab 5 feem pua |
Tsib cov qauv raug coj los ntawm txhua qhov kev tsim khoom batch thiab cov txiaj ntsig tau nruab nrab, yog li qhov kev txiav txim siab batch yog raws li qib kev tiv thaiv tiag tiag ntawm txheej txheej txheej.
Cov kab ntug hiav txwv: kub-dip galvanizing ntxiv rau passivation thiab fluorocarbon topcoat, nrog cov nplhaib sib khi ntawm lub qhov ntsia hlau.
Hnyav- cov kab thauj khoom: 40CrNiMoA steel nrog cov txheej txheem hlau txuas zinc diffusion txheej.
High- thaj tsam qhov siab txias: Q355E steel nrog qis-kub wax rov ua dua ua ntej txhua lub caij ntuj no.
FAQ
Vim li cas ib lub tsho loj ntawm cov xim tsis txaus rau cov ntses?
Ib txheej muaj pinholes thiab tsis tuaj yeem muab ob qho tib si thaiv thiab kev tiv thaiv kev txi. Multi- txheej txheej txheej nrog zinc- nplua nuj puag thiab ntom ntom npog npog cov txheej txheem corrosion sib txawv.
Kub-dip galvanizing ib leeg tuaj yeem tiv thaiv lub ntug hiav txwv ntses?
Nws tiv thaiv cov hlau tab sis cov zinc txheej nws tus kheej raug kev xeb dawb hauv ntsev tsuag yam tsis muaj kev cuam tshuam, thiab lub neej kev pab cuam luv dua li galvanized ntxiv rau fluorocarbon composite system.
Yuav ua li cas corrosion puas pom thaum kuaj?
Los ntawm kev kuaj pom kev xeb thiab blistering, ntsuas ntawm ntu tuab nrog lub ntsuas txheej, thiab kuaj xyuas ultrasonic thickness ntawm cov phaj xav tau. Bolt qhov chaw thiab rail tiv thaiv npoo yog thawj qhov chaw los xyuas.
Vim li cas Q355E tau teev tseg tsis yog tus qauv qauv?
Cov qib txheem tsis tau lees tias muaj kev cuam tshuam qhov hnyav ntawm qhov rho tawm 40 C. Q355E lav 34 J ntawm qhov ntsuas kub, uas tiv thaiv kev tawg ntawm qhov sib koom ua ke thaum lub caij ntuj no.
Ntev npaum li cas yuav tsum tau rov ua dua tshiab?
Cov kab ntug dej hiav txwv thiab cov ntsev tshuaj xyuas cov txheej txheem txhua rau lub hlis thiab kov cov kev puas tsuaj tam sim ntawd; txias- cheeb tsam ciab yog rov ua dua txhua xyoo ua ntej lub caij ntuj no. Tag nrho recoating nyob ntawm ntsuas zaj duab xis thickness thiab mob.