Tej yam tshwm sim ntawm corrosion nyob rau hauv steel -cored aluminium stranded hlau muaj xws li blackening ntawm txhuas strand nto, cov tsos ntawm dawb los yog tsaus grey corrosion me ntsis, txo conductivity, tsis muaj zog txhua yam muaj zog, thiab nyob rau hauv mob hnyav, strand breakage los yog txawm hlau breakage.
Specific Manifestations ntawm Corrosion
Pom pom qhov hloov pauv
Blackening ntawm Aluminium Strands: Ib txheej dub txhuas oxide txheej rau saum npoo ntawm txhuas hlau vim oxidation los yog kev sib cuag nrog cov kab mob, tshwj xeeb tshaj yog pom nyob rau hauv ib puag ncig ntub.
Corrosion Spots thiab Adhesives: Tsaus grey corrosion cheeb tsam tshwm nyob rau sab nrauv txhuas strands, nrog rau cov hmoov dawb hmoov nplaum, uas yog cov khoom siv electrochemical corrosion.
Zinc Coating Peeling: Cov zinc txheej ntawm cov tub ntxhais hlau maj mam ua tsis tiav vim corrosion, tev tawm thiab tsis muaj xim (xws li, tig dub- grey), poob nws txoj haujlwm tiv thaiv rau cov tub ntxhais hlau.
Deterioration ntawm hluav taws xob Performance
Corrosion ua rau txo qis ntawm tus ntoo khaub lig-sectional cheeb tsam ntawm aluminium strands los yog nce nyob rau hauv kev sib cuag tiv thaiv, ua rau ib tug txo nyob rau hauv conductivity ntawm kwv yees li 40%, thiab localized overheating tej zaum yuav tshwm sim.
Cov txheej txheej oxide saum npoo ua rau muaj kev tiv thaiv, ua rau muaj kev kub ntxhov hauv cheeb tsam, thiab hauv cov xwm txheej hnyav, annealing softening, ntxiv kev puas tsuaj.
Mechanical Properties poob
Corrosion ua rau cov tub ntxhais txoj kab uas hla ntawm steel ntswj (ntsuas txo ntawm 0.1-0.2 hli), uas ua rau cov neeg kho tshuab lub zog poob mus txog 60% thiab ib tug tseem ceeb txo nyob rau hauv tensile zog.
Under heavy loads, after the aluminum strands break, current transfers to the steel core, generating high temperatures (>400 degree), ua rau poob qis hauv cov tub ntxhais lub zog thiab thaum kawg ua rau cov hlau tawg.
Kev Ua Haujlwm Kev Nyab Xeeb Kev Nyab Xeeb tau nce ntxiv
Corroded thaj chaw yooj yim ua rau qaug zog tawg pib cov ntsiab lus, uas ua kom lawv cov kev nthuav dav hauv cov khoom muaj zog xws li cua vibration thiab galloping, ua rau strand breakage.
Yog tias tsis tau hais qhia tam sim ntawd, qhov no tuaj yeem ua rau txoj kab tsis zoo, hluav taws xob hluav taws xob, lossis txawm tias muaj kev nyab xeeb loj.