Qhov Tseem Ceeb Qhov txawv - Corrosion vs Oxidation
Corrosion thiab oxidation yog ob qho tib si cov txheej txheem uas tuaj yeem tshwm sim hauv ntuj lossis raug yuam, tab sis muaj qhov sib txawv ntawm cov txheej txheem corrosion thiab oxidation. Ob qho txheej txheem tuaj yeem ua kom nrawm nrog cov khoom siv sab nraud; Corrosion tus nqi tuaj yeem nce los ntawm cov huab cua ntub dej thiab oxidation tus nqi tuaj yeem nce ntxiv los ntawm kev xaiv cov catalysts. Corrosion tuaj yeem suav tias yog ib feem ntawm cov txheej txheem oxidation; Nws yog qhov ua tau yog ib qho kev puas tsuaj loj tshaj plaws ntawm oxidation. Ib qho tseem ceeb sib txawv ntawm corrosion thiab oxidation yog, corrosion feem ntau tshwm sim nyob rau hauv cov hlau thiab hlau cov ntaub ntawv, tab sis oxidation tshwm sim nyob rau hauv ntau yam ntaub ntawv xws li nyob thiab tsis muaj sia. Piv txwv li; oxidation tshwm sim hauv tib neeg lub cev nrog rau hauv cov hlau thiab tsis yog hlau.
Corrosion yog dab tsi?
Corrosion yog cov txheej txheem ntuj tsim uas degrades cov khoom muaj txiaj ntsig ntawm cov khoom xws li lub zog, qauv, tsos thiab permeability. Qhov no feem ntau tshwm sim hauv cov hlau, tab sis nws tuaj yeem tshwm sim hauv ceramics thiab qee yam polymers. Corrosion pib thaum cov hlau los yog cov khoom siv hlau raug rau cov cua thiab cov dej hauv ib puag ncig. Qee cov txheej txheem corrosion yog tswj los ntawm nws tus kheej tsim cov txheej txheem tiv thaiv ntawm qhov chaw; Txawm li cas los xij, nyob rau qee kis nws rhuav tshem cov khoom qub. Tab sis, muaj ntau yam kev ceev faj yuav raug coj los zam lossis tswj qhov teeb meem no.
Corrosion yog ib qho ua ke ntawm ob peb kauj ruam, pib los ntawm oxidation ntawm hlau (Fe rau hauv Fe 2+) thiab xaus nrog kev tsim cov txheej xeb ntawm qhov chaw.
Oxidation yog dab tsi?
Oxidation yog ib qho tshuaj tiv thaiv electrochemical ntawm Oxygen molecules thiab lwm yam tshuaj uas nws yuav tiv tau, suav nrog hlau thiab cov ntaub so ntswg nyob. Lub ntsiab txhais ntawm oxidation yog me ntsis ruam; raws li nws tau txhais nyob rau hauv ntau txoj kev; Qhov poob ntawm electron (s) lossis Hydrogen atom (s) thiab nce ntawm Oxygen atom yog hais tias yog oxidation. Cov txheej txheem rov qab ntawm oxidation yog txo.
Cov txheej txheem ntawm oxidation muaj ob qho zoo thiab qhov tsis zoo. Txhim kho cov metabolism, pab kom poob phaus, txo kev pheej hmoo ntawm mob qog noj ntshav, thiab txhim kho kev ua haujlwm ntawm antioxidants yog qee qhov zoo. Qhov tsis zoo yog cov txheej txheem puas xws li cov khoom siv xeb.
Qhov txawv ntawm Corrosion thiab Oxidation yog dab tsi?
Kev txhais ntawm Corrosion thiab Oxidation:
Corrosion: Corrosion yog txheej txheem ntawm deterioration lossis kev puas tsuaj ntawm cov hlau lossis cov khoom siv hlau los ntawm kev siv tshuaj lom neeg lossis cov tshuaj electrochemical, vim yog huab cua thiab dej.
Oxidation: Lub tswv yim ntawm oxidation tuaj yeem txhais tau peb txoj hauv kev.
1. Hais txog kev hloov hluav taws xob:
Qhov poob ntawm ib lossis ntau dua electron (s) los ntawm cov khoom lossis cov khoom hu ua oxidation.
Cu à Cu2+ + 2e
2. Hais txog kev hloov oxygen:
Qhov nce ntawm ib lossis ntau dua oxygen atom hu ua oxidation.
3. Hais txog kev hloov pauv hydrogen:
Qhov poob ntawm ib lossis ntau dua Hydrogen atom hu ua oxidation.
CH3CH2OH à CH3CHO + H 2
Cov txheej txheem corrosion thiab Oxidation:
Corrosion: Lub corrosion yog ib qho txheej txheem irreversible uas tau dhau los ntawm ntau qhov kev hloov pauv yooj yim
Oxidation: Oxidation tsis yog ib txheej txheem. Thaum peb xav txog qib molecular, nws tsuas yog muaj ob txoj haujlwm; oxidation thiab txo. Raws li ib hom oxidizes, lwm hom txo.
Cov txiaj ntsig ntawm Corrosion thiab Oxidation:
Corrosion: Cov txheej txheem corrosion tsis ncaj qha rau tib neeg vim tias nws rhuav tshem cov ntaub ntawv.
Oxidation: Cov txheej txheem oxidation muaj ob qho txiaj ntsig thiab qhov tsis zoo. Qee cov minerals tseem ceeb yog tsim los ntawm oxidizing tshuaj; Piv txwv li: Al2O3 (Aluminium oxide). Kev zom zaub mov, metabolism, tiv thaiv qog noj ntshav, hlawv roj yog qee qhov zoo ntawm oxidation. Kev xeb ntawm cov ntaub ntawv yog suav tias yog qhov tsis zoo tshaj plaws ntawm cov txheej txheem no.
Image Courtesy: "Nandu River Iron Choj corrosion - 03" los ntawm Anna Frodesiak - Tus kheej ua haujlwm. (CC0) ntawm Commons "Weathering 9039". (CC BY-SA 3.0) via Commons
