1.What cov nyhuv dab tsi ntawm cov steelness ntawm txias rolled steel muaj ntawm txheej txheej adhesion?
Tsim nyog saum npoo av nce qhov chaw sib ze ntawm cov txheej thiab lub substrate los ntawm ib qho "anchoring effect." Lub microscopic concave thiab convex cov qauv pub rau txheej txheem rau "embed" mus rau hauv substrate nto, ua yeeb yam xws li hooks thiab txhim kho adhesion. Yog tias cov saum npoo yog ib yam nkaus (ra me me, piv txwv li,<0.3μm), the mechanical bond between the coating and the substrate is insufficient, making it prone to peeling and detachment. However, if the surface is too rough (Ra too large, e.g., >3μm), cov pits saum npoo yog sib sib zog nqus dhau, ua rau nws nyuaj rau txheej los ua kom tiav lawv. Huab cua lossis impurities tuaj yeem yooj yim nyob hauv cov pits, ua rau pinholes thiab npuas nyob rau hauv txheej tom qab ziab, uas nyob rau hauv lem txo cov adhesion.
2.Yog li cas qhov nplaim tshem tawm ntawm txias - rolled steel muaj on txheej sib txawv thiab xim txawv?
Tsis ncaj ncees saum npoo roughness (piv txwv li, hauv zos ra variation> 0.5μm) ncaj qha ua rau cov txheej tsis sib xws tuab. Lub "peaks thiab hav thiab qhov sib tw ntxhib nyob rau hauv lub peaks thiab tuab tuab nyob rau hauv lub kwj ha Txog cov txheej xim, cov kev hloov pauv no nyob rau hauv coating thickness ntxiv ua rau sib txawv teeb meem (thicker thaj chaw yuav muaj cov xim tsaus nti thiab xim tsaus nti), thaum kawg ua rau muaj xim tsaus. (Qhov no yog ncaj qha cuam tshuam nrog yav dhau los "xim hloov kev tswj hauv cov xim pleev xim" thiab yog qhov ua tau cai ua ntej uas yuav tsum tau tswj hwm ua ntej.)
3.Yog li cas ua qhov tseeb ntawm txias - rolled steel muaj nyob rau ntawm lub galvanized txheej?
Nyob rau hauv cov txheej txheem galvanizing, nto rouggant cuam tshuam rau lub wettability ntawm zinc daws. Ib qho kev sib tw du heev tuaj yeem ua rau tsis sib xws kis tau ntawm zinc daws, ua rau cov plinc tsis zoo lossis nyias zinc txheej. Ib qho kev ntxhib ntxoo nyob rau hauv tuaj yeem ua rau muaj kev sib tw thiab cov roj stains hauv pits (uas nyuaj rau cov txheej tsis zoo ntawm zinc txheej thiab cov tsos thiab cov tsos ntawm "zinc blistering."
4.Yog dab tsi ua cov nyhuv ntawm qhov cub txias txias -}} rolled steel muaj nyob rau qhov ruaj khov ntawm formability?
Tsis ncaj ncees saum roughness tuaj yeem ua rau hauv zos hloov pauv hauv coeffient ntawm kev sib txhuam. Thaum Coefficient ntawm kev sib txhuam sib txawv los ntawm ntau dua 0.05 hla ntawm cov ntawv sib txawv, ua rau "ntws qeeb) lossis" tsis sib xws) (hauv zos ntau). Qhov kev cuam tshuam no yog hais tshwj xeeb rau cov khoom siv ua kom zoo, xws li tsheb hood. Tsis tas li ntawd, cov khoom siv ntxhib ntau dhau yuav ua kom nrawm pwm (nce kev sib txhuam ntawm cov pwm thiab cov protrusions), ua kom luv lub neej.
5.Yog li cas cov nplaim hluav taws xob ntawm txias txias -} rolled steel muaj nyob ntawm nws corrosion tsis kam?
Cov ua rau muaj kev xeb kev corrosion)
Ntau dhau ntawm qhov chaw ntawm kev sib cav (piv txwv li, ra ra> 2μm thiab qhov tob> 5μm) tuaj yeem ua rau hauv qab ntawm lub qhov chaw los ua "corrosion." Corrosive media xws li dej, ntsev, thiab paug tau yooj yim ntxiv hauv lub qhov. Yog hais tias txheej (lossis galvanizing txheej) tsis tau npog tag nrho, "lub zos electrochemical cell" tuaj yeem tsim (piv txwv li ua yeeb yam raws li cov npoo ntawm cov npoo ntawm cov khoom siv sab nraud ntawm cov khoom siv sab nraum zoov
Kev tiv thaiv zaj duab xis tsim efficiency:
Rau cov khoom lag luam uas cia siab rau cov yeeb yaj kiab oxide (piv txwv li, txias- chromate passivation tom qab galrosizing tiv thaiv corrosizing, yog ib qho kev sib tw ntawm xeb. Ib qho kev sib tw du heev Txawm li cas los xij, ib qho kev ntxhib hlob heev tuaj yeem ua rau cov yeeb yaj kiab tsis sib xws (nyias zaj duab xis ntawm pits), txo qis thoob plaws corrosion kev tiv thaiv zoo. Rau cov ntawv thov nrog cov kev tiv thaiv siab corrosion siab (piv txwv, tus RA yuav tsum tau tswj hwm ntawm 0.8 thiab 1.2μm kom ua tiav qhov sib npaug ntawm roughness thiab yeeb yaj kiab kev ncaj ncees.