Electroplating yog txheej txheem electrochemical nrog rau cov txheej txheem redox Cov txheej txheem tseem ceeb ntawm electroplating yog raus rau hauv cov tshuaj ntsev hlau raws li cov cathode thiab cov phaj hlau ua cov anode. Tom qab txuas nrog DC fais fab mov, cov txheej yuav tsum tau muab tso rau ntawm qhov chaw. Piv txwv li, nyob rau hauv nickel plating, lub cathode yog ib feem yuav tsum tau plated, thiab lub anode yog ntshiab nickel phaj. Cov tshuaj tiv thaiv hauv qab no tshwm sim ntawm anode thiab cathode raws li:
Cathode (plated part): ni2 plus plus 2e → Ni (cov tshuaj tiv thaiv tseem ceeb)
2h plus plus 2e → H2 ↑ (sab cov tshuaj tiv thaiv)
Anode (nickel phaj): ni-2e → ni2 ntxiv (cov tshuaj tiv thaiv tseem ceeb)
4OH- － 4E → 2h2o plus o2 (sab cov tshuaj tiv thaiv)
Tsis yog tag nrho cov hlau ions tuaj yeem tso los ntawm cov kua dej aqueous. Yog hais tias sab cov tshuaj tiv thaiv ntawm hydrogen ion txo mus rau hydrogen ntawm lub cathode yog qhov tseem ceeb, nws yog ib qho nyuaj rau cov hlau ions los precipitate ntawm lub cathode Raws li kev sim, muaj peev xwm ntawm electrodeposition ntawm hlau ions los ntawm aqueous tov yuav muab tau los ntawm lub periodic rooj ntawm lub ntsiab. .
Anodes tau muab faib ua anodes soluble thiab insoluble anodes. Feem ntau cov anodes yog soluble anodes sib raug rau cov txheej, xws li zinc anodes rau zinc plating, nyiaj anodes rau nyiaj plating, thiab tin lead alloy anodes rau tin txhuas alloy. Txawm li cas los xij, ob peb electroplating siv insoluble anodes vim muaj teeb meem hauv anode dissolution. Piv txwv li, platinum los yog titanium anodes feem ntau yog siv rau cov kua qaub kub plating, thiab lub ntsiab ntsev ions ntawm cov tshuaj plating yog ntxiv los ntawm kev ntxiv cov txheej txheem kub uas muaj cov tshuaj, Chromium plated anodes siv cov hmoov lead ntshiab, lead tin alloy, lead antimony alloy thiab lwm yam insoluble anodes.
