Vim li cas ho tsis tuaj yeem npaj cov tshuaj ntshiab chromic acid ntawm cov hluav taws xob cua sov raj tsim chromium? Vim li cas peb thiaj li yuav tsum tau txais kev kho mob electrolytic los yog ntxiv qee cov tshuaj plating qub los tsim cov txheej txheem zoo?
Tso lus
Vim li cas ho tsis tuaj yeem npaj cov tshuaj ntshiab chromic acid ntawm cov hluav taws xob cua sov raj tsim chromium? Vim li cas peb thiaj li yuav tsum tau txais kev kho mob electrolytic los yog ntxiv qee cov tshuaj plating qub los tsim cov txheej txheem zoo?
Teb: Cov tshuaj uas tau npaj tshiab ntshiab chromic acid, tsis muaj trivalent chromium thiab catalytic anions, tsis yooj yim txo los ntawm cathodic electrolysis. Cov hexavalent chromium ions nyob rau hauv chromic acid tsis txo qis rau trivalent chromium ions, thiab lawv tsis txo rau nws cov hlau chromium. Qhov tshwm sim ntawm electrolysis yog sib npaug ntawm cov dej decomposition, tsim cov roj hydrogen 2H ntxiv rau 2e → H2 ↑ ntawm lub cathode thiab oxygen 4OH -4e → 2H2O ntxiv rau O2 ↑ ntawm lub anode. Yog li chromium tsis tuaj yeem plated. Thaum sulfuric acid ntxiv rau cov tshuaj, nws thiab trivalent chromium nyob rau hauv cov tshuaj tsim complex zoo them chromium sulfate [Cr4O (SO4) (H2O) 4] 2 ntxiv. Vim hais tias lub ionic vojvoog ntawm sulfate yog me me thiab tus nqi siab, nws yog ib qho yooj yim rau adsorbed los ntawm qhov zoo nqi chromium sulfate, dhau los ntawm cov yooj yim chromium chromate colloidal daim nyias nyias, thiab txhawb cov paug ntawm Cr ions ntawm lub cathode rau precipitate hlau chromium. Hauv cov txheej txheem tshiab chromium plating tov, vim tsis muaj trivalent chromium, chromium tsis yooj yim plated, yog li kev kho electrolytic yuav tsum tsim trivalent chromium. Lub hom phiaj ntawm kev ntxiv qee qhov qub plating tov kuj tseem muaj qee qhov ntawm trivalent chromium hauv cov tshuaj plating los pab txhawb cov nag lossis daus ntawm cov hlau.
41. Vim li cas hlau yuav tsum tau electroplated?
Teb: Thaum cov hlau siv nyob rau hauv ntau qhov chaw, hlau corrosion tshwm sim vim cov tshuaj lom neeg thiab electrochemical los ntawm cov xov xwm sab nraud ntawm cov hlau nto. Qhov tshwm sim ntawm cov hlau corrosion tsis yog tsuas yog poob ntawm cov hlau nws tus kheej, tab sis kuj yog cov khoom pov tseg ntawm tib neeg thiab cov khoom siv los ntawm kev puas tsuaj ntawm cov khoom hlau, uas yog ntau zaus ntau dua li cov hlau nws tus kheej. Yog li ntawd, thaum tsim cov hlau thiab cov khoom siv hlau hauv cov khoom loj, nws yog ib qho tsim nyog los tawm tsam cov hlau corrosion. Cov txheej txheem electroplating yog ib txoj hauv kev zoo tshaj plaws los ua kom cov hlau tiv thaiv kev ua tau zoo thiab txhim kho hlau nto zoo. Electroplating ntawm cov khoom siv hlau yog los tiv thaiv cov hlau los ntawm corrosion, txhim kho kev ua tau zoo ntawm cov khoom hlau, thiab ua kom zoo nkauj ntawm cov khoom.
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