1.Dab tsi yog qhov txawv ntawm kev tiv thaiv-corrosion mechanism ntawm galvanized coil (zinc steel) welded pob qij txha thiab tinned coil (tin steel) welded pob qij txha?
Galvanized steel kauj (zinc steel) welded sib koom ua ke corrosion tiv thaiv mechanism cathodic tiv thaiv (sacrificial anode)
Cov txheej txheem tiv thaiv corrosion ntawm tinned coil (tin steel) welded sib koom yog lub cev thaiv
2.Dab tsi yog qhov zoo thiab qhov tsis zoo ntawm tus cwj pwm corrosion ntawm welded pob qij txha ntawm ob?
Qhov zoo ntawm Galvanized Coil (Zinc-Steel) Welded Joints: Txawm tias vuam puas ua rau cov zinc txheej, qhov chaw raug steel lossis weld cheeb tsam yog cathodically tiv thaiv los ntawm ib puag ncig zinc txheej. Cov zinc corrodes nyiam dua, yog li tiv thaiv cov hlau hauv qab.
Qhov tsis zoo: Corrosion yog concentrated nyob rau hauv zinc txheej nyob ze ntawm lub weld, tsim ib tug non-cov khoom siv dawb zinc corrosion (dawb xeb).
Lub cev qaug zog: Thaum lub tin txheej puas lawm (piv txwv li, los ntawm vuam los yog khawb), cov hlau uas muaj cov substrate thiab cov tin nyob ib puag ncig tsim ib lub xov tooj ntawm corrosion nrog ib tug loj cathode thiab ib tug me me anode. Lub tin, ua raws li cov cathode, ceev ceev ceev corrosion (pitting) ntawm qhov raug, me me ntawm cov hlau substrate.
Advantage: Thaum lub txheej tsis zoo, tin yog tshuaj lom neeg ruaj khov thiab muaj kev tiv thaiv zoo heev.
3.Dab tsi yog qhov sib txawv ntawm kev sib tw vuam ntawm ob?
Galvanized Coil (Zinc Steel) Welded Joints
Zinc Burnout: Zinc muaj qhov kub tsis tshua muaj kub (~ 907 degree) thiab yooj yim evaporates nyob rau hauv qhov kub ntawm arc kub, tsim cov zinc vapor ntau.
Welding Defects: Zinc vapor tuaj yeem rub mus rau hauv lub pas dej welding, ua rau muaj teeb meem xws li porosity, tsis muaj fusion, thiab kev sib tsoo ntau dhau ntawm qhov vuam.
Yuav tsum tau ua haujlwm tshwj xeeb: Qhov no feem ntau yuav tsum tau txo cov cua sov, siv cov vuam tshwj xeeb, thiab ua tib zoo tu qhov zawj.
Tin Coil (Tin Steel) Welded Joints
Tin Burnout: Tin muaj qhov qis melting point (~ 232 degree), ua rau nws yooj yim yaj thiab ntws thaum vuam, ua rau muaj kev puas tsuaj rau cov txheej.
Alloy Layer Embrittlement: Tin thiab hlau daim ntawv nkig intermetallic tebchaw xws li FeSn₂, uas tej zaum yuav cuam tshuam rau lub toughness ntawm weld hlau.
Weldability: Liquid tin has a high surface tension, which may affect the wetting and formation of the weld.
4.Dab tsi yog qhov txawv ntawm cov txheej txheem vuam?
Welding galvanized steel: The key challenge is to solve the process problem-how to control the effects of zinc vapor to achieve a dense, defect-free weld. Corrosion tsis kam nws tus kheej tsis yog qhov teeb meem loj.
Vuam tinned hlau: Cov txheej txheem yog qhov yooj yim, tab sis qhov kev sib tw tseem ceeb yog los daws qhov teeb meem corrosion- yuav ua li cas kom ntseeg tau qhov kev ncaj ncees ntawm cov txheej, los yog yuav ua li cas thiaj li muab cov welded sib koom ua ke nrog kev tiv thaiv corrosion tom ntej (xws li txheej txheej sab hauv ntawm cov kaus poom zaub mov).
5.Dab tsi yog cov ntsiab lus thiab xaiv cov lus qhia?
Yog hais tias koj cov khoom yuav raug corrosive ib puag ncig xws li ya raws thiab ntsev tsuag, thiab lub zog thiab durability yog qhov tseem ceeb, xaiv galvanized steel. Nws cov pob qij txha welded tuaj yeem ua tiav ntev -lub sijhawm, txhim khu kev tiv thaiv corrosion los ntawm kev tsim nyog thiab tom qab- kho.
Yog tias koj cov khoom siv feem ntau siv rau sab hauv lossis ib puag ncig me me, xws li kev sib khi, kev sib cuag khoom noj, lossis ntim khoom siv hluav taws xob, thiab muaj cov kev cai nruj rau kev tsim, weld tsos, thiab toxicity, xaiv tinned steel. Txawm li cas los xij, nws yog ib qho tseem ceeb kom nkag siab tias cov pob qij txha welded yog cov ntsiab lus tsis muaj zog hauv kev tiv thaiv corrosion thiab yuav tsum tau hais los ntawm kev tsim qauv (xws li tsis txhob cuam tshuam cov pob qij txha) lossis tom qab- kev kho mob (xws li siv lub sealant).