1.What ua rau microcracks?
Cause: Tom qab Plated ntu yog muab tawm ntawm cov laujk zinc, nws txias nrawm nrawm. Lub thermal expansion coefficient ntawm zinc txheej (tshwj xeeb tshaj yog cov thicker zinc-hlau txheej) yog txawv ntawm cov hlau substrate, thiab kev ntxhov siab sab hauv yog tsim tsim thaum lub sij hawm txias thiab shrinking txheej txheem. Cov kab nrib me me nkhaus sib tshuam rau saum npoo tau yooj yim tsim nyob rau hauv cov ces kaum, Welds-thickness lossis thaj chaw nyob qhov twg substrate kev ntxhov siab yog feebrated. Nta: feem ntau yog qhov zoo, ntiav, cov ntxaij tsis xwm yeem lossis cov kab tawg, feem ntau tsis meej rau sab hauv ntawm zinc txheej. Feem ntau pom nyob rau hauv zinc-hlau alloy txheej.
2.Yog dab tsi ua cov microcracks ntiav hauv cov hlau tsis muaj hlau substrate muaj rau corrosion tsis kam?
Qhov cuam tshuam yog me me thiab feem ntau tau txais:
Qhov kev tiv thaiv kev txi ntawm Zinc tseem ua haujlwm: txawm tias muaj cov txheej txheem hlau loj tsis txhob nkag rau hauv qab ntawm cov hlau tawg hauv qab los ntawm "kev tua kab mob". Txoj kev xeb tam sim no yuav nyiam cov zinc nyob ze ntawm cov tawg es tsis yog kev tsim kom tob dua.
Corrosion cov khoom yuav thaiv cov khoom tawg: lub alkaline corrosion khoom (xws li zinc fydrosion muaj qee qhov kev ntim khoom, uas yuav maj mam sau thiab rov sau ntxiv corrosion.
3.Yog li cas ua qhov sib sib zog nqus cov pob tawg uas ua rau cov hlau substrate muaj ntawm corrosion tsis kam?
Qhov cuam tshuam yog loj, thiab kev tawm tsam kev ua haujlwm corrosion yog txo qis:
Kev nthuav dav ncaj qha ntawm cov hlau matrix: qhov tawg mus txog ntawm cov hlau matrix ncaj qha, tsim cov galvanic corrosion cell ntawm "me me anode (zinc) -LARE Cathle Cathle Cathle Cathle Cathoo (Hlau)". Cov hlau raug (Cathode) yog kev tiv thaiv, tab sis thaj tsam loj ntawm zinc (anode) ib ncig ntawm nws yuav noj sai dua los tiv thaiv tus taw tes tiv thaiv.
"Ntug dej" Amplifies corrosion: Cov zinc txheej ntawm ntug kev tawg vim qhov tam sim no, ua rau muaj kev kub ntxhov, rhuav tshem cov txheej tiv thaiv ib puag ncig.
Kev pheej hmoo siab ntawm pitting corrosion: ua rau lub ntsiab lus pib ntawm cov neeg nyiam corrosion (pitting siab rau hauv cov hlau loj.
Zoo heev rau kev tiv thaiv corrosion: xws li tsis xws luag yog cov ntsiab lus tsis muaj zog hauv kev tiv thaiv corrosion. Yog tias tsis kho, lub neej xav pom ntawm tag nrho cov sib xyaw ua ke yuav raug txo qis.
4.How txiav txim qhov kev phom sij ntawm microcracks?
Saib xyuas qhov tob thiab substrate raug: saib nrog lub qhov muag liab qab lossis xim av uas muaj zog tsom (grey-dawb) ntawm cov steel substrate pom nyob hauv qab ntawm pob tawg? Yog pom tias, lub substrate yog nthuav tawm.
Measure crack width and density: Cracks that are too wide (>0.5 hli) lossis faib faib muaj kev pheej hmoo ntau dua. Qhov chaw: kab nrib pleb uas nyob hauv cov chaw ntxhov siab ntau (xws li nyob ze Welds) thiab cov cheeb tsam tau txais kev vam meej thiab kev sib zog ua kom zoo nkauj (xws li zuaj) muaj kev phom sij ntau.
5. Dab tsi yog cov ntsuas tiv thaiv?
Txhim kho cov txheej txheem galvanizing: tswj cov zincer kub, lub sijhawm siv zog, xws li txias txias) kom txo qis kev ntxhov siab.
Cov qauv tsim: Tsis txhob ntse npoo thiab cov ces kaum, siv cov ces kaum sib npaug rau kev hloov pauv; Ua kom zoo dua welding txheej txheem los txo qis kev ntxhov siab.
Ua tib zoo saib xyuas thiab kev teeb tsa: Zam kev puas cov tshuab puas, siv cov ntaub ntawv tsim nyog thiab tiv thaiv cov ntaub qhwv.
Xaiv cov txheej txheem ua haujlwm siab: hauv cov dej num hnyav lossis thaum tawm tsam kev tiv thaiv corrosion yog tsis tshua muaj siab heev, txiav txheej xim zinc--magnesium (ZMA). Nws tau muaj zog dua kev kho tus kheej. Txawm hais tias txheej muaj cov khawb av me me lossis cov khoom tawg, cov khoom sib xyaw hauv cov xeb (muaj cov sib xyaw ua ke) tuaj yeem muab cov khoom siv tsis xws luag thiab muab kev tiv thaiv zoo dua.