Corrosion nyhuv ntawm lub cub tawg roj ntawm hluav taws xob cua sov ntsiab
Tso lus
Corrosion nyhuv ntawm lub cub tawg roj ntawm hluav taws xob cua sov ntsiab
Qhov thib ib yog cov txiaj ntsig zoo corrosion ntawm cov roj txheeb ze rau kev tiv thaiv oxide zaj duab xis. Cov corrosive tshaj plaws yog Cl2, ua raws li SO2 thiab SO3. Txhawm rau tiv thaiv roj theem corrosion, hluav taws xob cua sov alloys yuav tsum muaj cov yeeb yaj kiab tiv thaiv zoo heev. Tam sim no, tsuas yog hluav taws xob cua sov alloys uas muaj chromium siab thiab siab aluminium tuaj yeem ua tau raws li qhov yuav tsum tau ua.
Qhov thib ob yog kev yaig ntawm cov yeeb yaj kiab oxide tiv thaiv los ntawm cov khoom kub kub uas tau muab tshem tawm hauv cov roj cua kub. Thaum cov khoom-theem cov khoom nyob rau hauv high-temperature furnace gas hu rau saum npoo ntawm cov hluav taws xob cua sov alloy, lawv yuav ua raws li qhov chaw los tsim cov ntsiab lus uas tsis tshua muaj melting point, rhuav tshem cov nyhuv tiv thaiv ntawm oxide zaj duab xis, thiab ua kom puas. txheej txheem ntawm hluav taws xob cua sov caij. Ntawm lawv, qhov teeb meem tshaj plaws yog cov khoom theem ntawm K2O thiab Na2O.
Cov yeeb yaj kiab oxide tiv thaiv yog tib qho kev tiv thaiv los tiv thaiv carburization ntawm hluav taws xob cua sov ntsiab lus. Thaum cov oxide zaj duab xis puas lawm, cov roj txo yuav nkag mus rau hauv cov hlau los ntawm kev puas tsuaj thiab carburize. Lub affinity ntawm chromium, hlau thiab carbon nyob rau hauv hluav taws xob cua sov alloys muaj zog heev, thaum txhuas, silicon, npib tsib xee, thiab lwm yam yog tsis muaj zog heev. Yog li ntawd, thaum cov roj carburizing tiv tauj cov hlau, cov tshuaj tom qab carburizing yuav tshwm sim.
Cov khoom tseem ceeb ntawm kev tiv thaiv oxide zaj duab xis ntawm hluav taws xob cua sov alloy yog: Cr2O3, NiO, Fe2O3 rau nickel-chromium thiab nickel-chromium-hlau alloys, thiab Al2O3, Cr2O3 rau hlau-chromium-aluminium alloys. Cov oxides no muaj qhov kub thiab txias hauv qhov muaj zog txo cov pa roj carbon monoxide. Nws txiav txim siab lub zog ntawm alloy lub carburization kuj.
Thaum qhov kub thiab txias, tom qab hluav taws xob cua kub cua tiv tauj cov pa roj carbon monoxide, cov yeeb yaj kiab tiv thaiv oxide yuav raug rhuav tshem, thiab tom qab ntawd cov pa roj carbon monoxide yuav nkag mus rau hauv cov hlau los ua cov tshuaj tiv thaiv carburizing. Cov tsim carbides yuav ua rau cov nqi ntawm cov hlau tsis kam nce, cov yas kom txo qis, cov tawv nqaij tawm, thiab thaum kawg cov cua sov ua tsis tau sai.
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