Qhov sib txawv tseem ceeb ntawm kev txi anode thiab kev qhuas tam sim no yog tias nyob rau hauv kev txi anodes, hlau los yog hlau yog muab tso rau hauv thiaj li yuav ua raws li anode es tsis txhob ntawm cov hlau los tiv thaiv whereas, impressed tam sim no txoj kev, ib tug DC tam sim no. yog muab rau cov hlau kom tiv thaiv kom nws ua cathode.
Kev tiv thaiv kev txi thiab kev txaus siab tam sim no yog ob hom kev tiv thaiv cathodic (CP). Ntxiv mus, kev tiv thaiv cathodic yog ib txoj hauv kev tiv thaiv cov hlau nto ntawm corrosion los ntawm kev muab nws nrog rau sab nraud cathodic tam sim no.
Dab tsi yog Sacrificial Anode?
Ib qho kev txi anode yog cov hlau uas muaj zog heev uas tuaj yeem txuag cov hlau tsis tshua muaj zog los ntawm corrosion. Nws tuaj yeem yog hlau lossis hlau alloy. Lwm lub npe rau hom anodes no yog galvanic anode. Cov anodes muab kev tiv thaiv cathodic. Txawm li cas los xij, raws li anodes tau noj thaum lub sijhawm tiv thaiv, kev tiv thaiv yuav tsum tau hloov thiab tswj.
Thaum xav txog cov ntaub ntawv siv rau kev txi anodes, lawv yog cov hlau ntshiab feem ntau; i.e. zinc thiab magnesium. Qee zaum, peb siv cov alloys ntawm magnesium lossis aluminium ib yam nkaus. Tsis tas li ntawd, cov anodes no muab kev tiv thaiv los ntawm kev ua electronegative los yog ntau anodic ntau dua li cov hlau tiv thaiv. Nyob rau hauv tus txheej txheem ntawm kev tiv thaiv, ib tug tam sim no yuav dhau los ntawm lub sacrificial anode rau cov hlau tiv thaiv, thiab cov hlau tiv thaiv yuav ua tau ib tug cathode. Yog li, qhov no tsim cov galvanic cell.
Daim duab 01: Corrosion of Sacrificial Anodes
Nyob rau hauv kev muab cov anodes fij tseg, peb tuaj yeem siv cov hlau lead (nrog rau cov hlau saum npoo peb yuav tiv thaiv los ntawm kev vuam) lossis siv cov hlua cam khwb cia-m (xws li los ntawm vuam lossis siv tau cov hlua khi los ua qhov chaw rau daim ntawv txuas). Cov ntawv thov ntawm kev txi anodes suav nrog kev tiv thaiv ntawm lub nkoj nkoj, lub tshuab rhaub dej, cov kav dej, cov tso tsheb hlau luam hauv av, cov chaw tsim khoom, thiab lwm yam.
Tam sim no yog dab tsi?
Txaus siab tam sim no yog hom kev tiv thaiv cathodic siv cov tshuaj electrochemical kom tau txais kev tiv thaiv corrosion. Thiab, txoj kev no yog qhov tseem ceeb rau kev tiv thaiv cov qauv loj xws li cov kav dej ntev ntev vim tias cov anodes sacrificial tsis tuaj yeem tiv thaiv cov qauv no. Peb tuaj yeem pom cov qauv no ua ICCP, uas sawv cev rau kev tiv thaiv cathodic tam sim no.
Nyob rau hauv txoj kev no, peb siv qhov zoo siab tam sim no los hloov cov hlau corroding los ntawm anode mus rau cathode. Ntawm no, peb yuav tsum tau siv lub impressed tam sim no nyob rau hauv lub opposite kev coj mus rau lub corrosion tam sim no. Feem ntau, tam sim no qhov chaw yog DC fais fab mov. Peb tuaj yeem muab qhov tam sim no rau graphite, stainless hlau, thiab lwm yam uas tsis yaj raws li cov khoom siv tam sim no. Yog li, cov ntaub ntawv no yog cov anodes uas peb yuav hloov mus rau hauv cathodes thaum txoj kev no. Tsis tas li ntawd, qhov tsis zoo kawg ntawm qhov tam sim no yuav tsum txuas mus rau cov qauv uas peb yuav tiv thaiv.
Daim duab 02: Txoj Kev ICCP
Ntxiv mus, cov kev siv ntawm txoj kev no suav nrog kev tiv thaiv cov hlau hauv dej hiav txwv lossis av, cov kav dej hauv qab hiav txwv, lub nkoj, cov roj platform hauv cov hlau thiab pob zeb, cov choj pob zeb tso rau hauv dej hiav txwv, cov kav dej faus rau hauv av, cov tank hauv av, thiab lwm yam.
Dab tsi yog qhov txawv ntawm Sacrificial Anode thiab Impressed Tam sim no?
Ib qho kev txi anode yog cov hlau uas muaj zog heev uas tuaj yeem tiv thaiv cov hlau tsis tshua muaj zog los ntawm corrosion. Nyob rau hauv sib piv, ib qho impressed tam sim no yog ib hom kev tiv thaiv cathodic siv electrochemical txhais tau tias kom tau txais kev tiv thaiv corrosion. Nyob rau hauv kev txi anodes, ib tug hlau los yog alloy yog muab tso rau hauv thiaj li yuav ua raws li lub anode es tsis txhob ntawm cov hlau los tiv thaiv whereas, nyob rau hauv impressed tam sim no txoj kev, ib tug DC tam sim no muab rau cov hlau los tiv thaiv nyob rau hauv thiaj li yuav ua rau nws cov cathode. Li no, qhov no yog qhov sib txawv tseem ceeb ntawm kev txi anode thiab impressed tam sim no.
Hauv qab infographic qhia cov ntaub ntawv ntxiv ntsig txog qhov sib txawv ntawm kev txi anode thiab impressed tam sim no.
Summary – Sacrificial Anode vs Impressed Current
Ib qho kev txi anode yog cov hlau uas muaj zog heev uas tuaj yeem tiv thaiv cov hlau tsis tshua muaj zog los ntawm corrosion. Lub caij no, ib qho kev txaus siab tam sim no yog hom kev tiv thaiv cathodic siv electrochemical txhais tau tias kom tau txais kev tiv thaiv corrosion. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm kev txi anode thiab impressed tam sim no.
