Nyob rau hauv ib txwm atmospheric cov cua, cov huab cua zoo tsim muaj xeb zoo ruaj khov xeb patina uas tsis yog tev lossis muaj kev paub txog lub sijhawm theem nrab ncua sijhawm. Qhov kev ua tau zoo no stems los ntawm peb tus tseem ceeb txheej:
Patina Maturation cov txheej txheem
The initial rust layer (formed within 6-24 months) gradually densifies into a tightly adherent barrier composed primarily of nanocrystalline goethite (α-FeOOH) with magnetite (Fe₃O₄) inclusions. This transformation reduces the patina's porosity from >30% (theem pib) rau<5% (mature phase), creating an effective diffusion barrier against corrosive elements.
Alloy -} Txhim Kho Kev Tiv Thaiv
Cov ntsiab lus tseem ceeb tshaj plaws ua rau muaj cov haujlwm tiv thaiv:
Tooj liab (0.25- 0.55%) cov foos insoluble tooj liab-hlau ua uas thaiv cov chaw nquag
Phosphorus (0.07-0.15%) catchalyzes tsim ntawm amorphous hlau oxyhydrounds
Chromium (0.5 - 1.25%) tsim chromium-nplua nuj oxide network tiv taus cov kua qaub
Npib tsib xee (0.02-0.35%) tiv thaiv microcrack propagation nyob rau hauv lub patina
Tus kheej -} kho cov peev xwm
Cov Hlau Tso Tawm Ntawm Cov Ntawv Cog Tseg Culonomous Daus:
Cov neeg kho tshuab me me ua kom puas tsuaj ua kom cov neeg nyob hauv zos rov - passive
Alloying cov ntsiab lus tsiv mus rau qhov chaw tsis xws li kev thauj yaam
Cov neeg muaj xeb tshiab nyiam cov theem tiv thaiv hluav taws xob ntau dua li cov oxous oxide
Kev txiav txim siab ib puag ncig:
Nyob rau hauv kev sib zog ib puag ncig (ntug dej / muaj), cov ntsiab lus ntxiv no thov:
Chloride deposition >0.5mg / dm² / hnub yuav xav tau cov muaj kev hloov kho (piv txwv li, 3% ni ntxiv)
Sulfur dioxide levels >50ug / M³ tau txais txiaj ntsig los ntawm kev txhim kho cov crats (nce txog 2.5%)
Tsim kom meej (tsawg kawg 60℃degree, 5 hli switter txheem) tiv thaiv kev ua haujlwm noo noo
