Tsis kho ASTM A847 (ib siab -lub zog huab cua) ua raws a4-theem natural patina tsim voj voogsab nraum zoov, nrog rau tag nrho maturation lub sij hawm ntawm12–24 lub hlishauvmos, huv si, zoo -ventilated temperate tej yam kev mob(qhov zoo tshaj plaws ib puag ncig rau uniform patina). Lub voj voog yuav luag zoo ib yam rau lwm cov huab cua huab cua (SPA-H, ASTM A588) thiab sib txawv me ntsis nrog rau ib puag ncig (humidity, pollution, ntsev).
Kauj Ruam 1: Pib Lub Teeb Liab Teeb (1-3 lub hlis)
Nyias, xoob txiv kab ntxwv / lub teeb liab nto xeb cov ntaub ntawv raws li hlau oxides teb nrog huab cua thiab noo noo; txheej yog tsis-adherent, tsis sib xws, thiab muabtsis muaj kev tiv thaiv corrosion- tau yooj yim ntxuav los ntawm nag.
Theem 2: Rust Layer Densification & Xim Deepening (3-6 lub hlis)
Alloy cov ntsiab lus (Cu, Cr, Ni hauv ASTM A847) pib ua haujlwm, tsim cov hlau ruaj khov- alloy oxide compounds; cov xeb txheej thickens, darkens rau reddish-xim av, thiab pib ua daim ntawv cog lus rau steel nto- noo noo nkag mus rau hauv, thiab pib corrosion kuj tsim.
Theem 3: Patina Stabilization (6-12 lub hlis)
Cov txheej oxide ua ntom ntom ntom ntom ntom ntom rau cov hlau; lub patina nyob rau hauv ib qho sib sib zog nqus reddish -xim av / russet nrog ib tug matte zoo nkauj-core tiv thaiv daim ntawv, thiab steel tus nqi corrosion poob mus rau ib qho ultra- qib qis. Qhov me me ntawm qhov tsis sib xws kuj tseem muaj nyob hauv qhov chaw tsis zoo (piv txwv li, cov av qis).
Theem 4: Tag Nrho Patina Maturation (12–24 lub hlis)
Ib qho ua tiav, ruaj khov, tus kheej - txheej tiv thaiv patina yog tsim tag nrho; nws yog tuab, tsis yog -peeling, thiab uniformly xim (nplua nuj reddish-xim av nrog hloov maj mam ntuj variations)-Kev tiv thaiv corrosion mus tas li yog tiav, thiab patina tsuas yog ua kom zoo nkauj mos mos (tsis muaj degradation) hauv xyoo tom ntej.
Tseem ceeb Environmental Variations rau lub voj voog
Siab -humidity/clean area: Kev loj hlob sai me ntsis (10-18 lub hlis) vim muaj dej noo zoo ib yam rau kev tsim cov hlau oxide.
Arid / qhuav: Lub voj voog qeeb qeeb (24+ hli); thawj txheej xeb tseem xoob kom ntev dua, nrog kev ncua ntev.
Siab - thaj chaw ntsev / kuab paug: Tsis sib luag patina tsim (tsis muaj sijhawm teem sijhawm); Lub voj voog raug cuam tshuam, thiab patina yuav tsis tuaj yeem loj hlob (kev pheej hmoo ntawm pitting corrosion / peeling yam tsis muaj kev tiv thaiv kev kho mob).
