Tsis muaj kev hloov pauv rau corrosion- tsav tsheb chemistry Normalizing muaj cua sov rau 880-920 ° C thiab cua txias, uas tsuas yog reshapes cov hlau ferrite -pearlite grain qauv thiab relieves residual stresses- nws tsis ntxiv, tshem tawm, los yog hloov lub concentration ntawm cov tub ntxhais weathering alloy cov ntsiab lus (0.20–0.50% Cu, 1.5% Cr, 1.5% Cr. 0.07–0.15% P) uas txav mus rau saum npoo los tsim cov hydroxycarbonate{10}} nplua nuj tiv thaiv patina. Lub Cu/Cr/P-nplua nuj precipitates nyob rau hauv lub ferrite matrix (tseem ceeb rau patina nucleation) nyob twj ywm tsis tu ncua dispersed post-normalization, tsis muaj cov qauv kev hloov pauv rau cov corrosion{14}} theem nquag.
Tsis muaj kev cuam tshuam rau patina tsim ceev lossis zoo Ib tug normalized SPA-H workpiece thiab ib tug tsis kho (kub / txias- dov / welded) ib tug yuav tsim tib tuab tuab, uniform reddish- xim av patina ntawm lubtus nqi zoo ib yam(6-12 lub hlis rau tag nrho cov tsim nyob rau hauv nroog / nyob deb nroog ib puag ncig) thaum raug ib puag ncig tej yam kev mob (humidity, ntsev tsuag, pa phem). Qhov zoo equiaxed ferrite-pearlite microstructure los ntawm normalizing tsis cuam tshuam cov txheej txheem oxidation lossis lub cev / tshuaj lom neeg ntawm cov tsim patina- nws qhov kev tiv thaiv ntom ntom thiab adhesion rau steel nto tseem tsis hloov.
Kev txhim kho me me tsis ncaj ncees rau kev ua haujlwm zoo corrosion Normalizing tshem tawm rolling/welding-induced microstructural defects (residual stress-related microcracks, grain boundary crevices, uneven banding) thiab homogenizes steel lub deg microstructure. Cov teeb meem no tuaj yeem cuam tshuam cov dej noo, plua plav, lossis cov pa phem nyob rau hauv cov theem thaum ntxov ntawm kev raug, uas yuav ua rau lub zos pitting los yog tsis sib xws oxidation ua ntej lub patina yog tag nrho tsim. Los ntawm kev tshem tawm cov chaw tsis xws luag, normalizing tsim ib smoother, ntau yam steel nto uas txhawbzoo ib yam patina tsim nyob rau hauv tag nrho cov workpiece, zam cov cheeb tsam me me ntawm qhov ntxov ntxov localized corrosion. Qhov no yog ib qho kev txhim kho thib ob rau kev ua tau zoo ntawm - ntiaj teb kev ua tau zoo, tsis yog ib qho kev txhawb nqa rau cov hlau tsis muaj zog corrosion.
Tsis muaj kev nce hauv susceptibility rau localized corrosion
Normalizing tsis ua rau muaj kev pheej hmoo ntawm pitting, crevice corrosion, los yog intergranular corrosion nyob rau hauv me me ntug dej hiav txwv los yog industrial cheeb tsam. Cov hlau tsis kam rau cov hom kev xeb hauv cheeb tsam no yog tswj hwm los ntawm nws cov alloy muaj pes tsawg leeg thiab kev tiv thaiv patina, tsis yog cov nplej loj lossis cov kev ntxhov siab seem-ob qho tib si thiab tsis kho SPA-H qhia qhov tsis tshua muaj kev cuam tshuam rau hauv cheeb tsam corrosion (corrosion tus nqi 0.02–0.03 mm / xyoo hauv cov ntug dej hiav txwv me me) tom qab patina formations.
