Feem ntau muaj teeb meem impurity nyob rau hauv txhuas yog hlau. Hauv kev tsim cov txheej txheem ntawm lub tsev aluminium profiles, thaum cov ntsiab lus hlau ntau dua 0.25 feem pua, cov xim ib txwm tsis tuaj yeem tau. Raws li cov ntsiab lus hlau nce, qhov glossiness txo qis, thiab cov xim xim zoo li xiav, nrog lub teeb grey thiab lub teeb grey uas nyuaj rau saib.
Thaum cov ntsiab lus ntawm silicon nyob rau hauv kub yog tsawg, lub zog ntawm cov hlau tseem ceeb dua. Thaum cov ntsiab lus silicon siab, cov teebmeem ntawm cov hlau tuaj yeem txo qis rau qee yam. Lub sijhawm no, hlau thiab silicon tsim AlFeSi intermetallic tebchaw, thaum tseem siv qee cov silicon ntau dhau. Qhov laj thawj tseem ceeb vim li cas hlau cuam tshuam rau xim yog qhov tsim ntawm taw tes lossis pas nrig zoo li cov qauv ntawm cov hlau thiab txhuas, xws li ntawm ob peb micrometers mus rau kaum micrometers. Nws lub peev xwm electrode txawv ntawm cov txhuas, uas cuam tshuam rau qhov sib xws thiab txuas ntxiv ntawm oxidation xim thiab kuj txo cov luster thiab pob tshab ntawm oxide zaj duab xis, cuam tshuam rau cov xim xim.
Ib qho me me ntawm tooj liab yog qhov muaj txiaj ntsig zoo rau cov khoom siv kho tshuab thiab qhov ci ntsa iab ntawm qhov profile, tsis tas yuav txo nws cov corrosion kuj. Tab sis thaum cov ntsiab lus tooj liab siab, oxide zaj duab xis nyiam dub, uas tuaj yeem pom ntawm qhov muag liab qab. Ib qho me me ntawm manganese tuaj yeem ua rau qee qhov tshem tawm cov teeb meem cuam tshuam ntawm AlFeSi qauv thiab txo cov tiam ntawm extrusion kab. Txawm li cas los xij, thaum cov ntsiab lus ntawm manganese siab, oxide zaj duab xis yuav tig daj, thiab raws li cov ntsiab lus ntawm manganese nce, nws maj mam nce mus rau xim daj daj, ua rau cov xim tsis zoo. Thaum cov zinc cov ntsiab lus siab, nws ua rau kom qhov nyuaj ntawm extrusion, qhov loj ntawm qhov profile yog ntxhib, pwm poob kuj loj, oxide zaj duab xis yog milky, thiab nws ua rau tsub zuj zuj ntawm zinc ions nyob rau hauv alkaline corrosion daws. , ua rau cov zinc invert rau ntawm qhov profile thiab tsim cov tawv nqaij ci iab zoo li pob.
Thaum cov ntsiab lus titanium ntau dua {{0}}.1 feem pua, nws muaj kev cuam tshuam loj rau cov xim xim thiab xim txawv ntawm cov xim profile, uas yog tshwm sim los ntawm qhov tsis sib xws ntawm titanium. Yog li ntawd, txhawm rau kom ntseeg tau qhov zoo ntawm qhov profile, cov ntsiab lus hlau yuav tsum tau tswj hauv qab no 0.25 feem pua, thiab cov ntsiab lus ntawm lwm yam impurities yuav tsum tsawg dua 0.1 feem pua.
