Cathodic kev tiv thaiv tshuab yog ib hom kev tiv thaiv electrochemical, uas siv cov khoom siv sab nraud rau saum npoo ntawm cov hlau corroded. Cov qauv kev tiv thaiv dhau los ua cov cathode, yog li inhibiting electron migration uas tshwm sim thaum hlau corrosion thiab zam los yog txo qhov tshwm sim ntawm corrosion.

Cathodic kev tiv thaiv tshuab tuaj yeem muab faib ua kev faus anode cathodic tiv thaiv thiab impressed tam sim no cathodic tiv thaiv. Cov cuab yeej no yog qhov pib paub tab thiab dav siv rau kev tiv thaiv corrosion ntawm cov khoom siv hlau xws li cov kav dej steel, cov twj tso kua dej, cov cables, cov chaw nres nkoj, nkoj, lub tank hauv qab, txias txias, thiab lwm yam hauv av, dej hiav txwv, dej qab zib, thiab tshuaj lom neeg.

Sacrificial anode cathodic tiv thaiv yog cov txheej txheem ntawm kev sib txuas ob hlau nrog cov dej num sib txawv thiab muab tso rau hauv tib lub electrolyte. Cov hlau nquag plam electrons thiab corroded, thaum cov hlau tsis tshua muaj zog tau txais kev tiv thaiv electron. Vim yog qhov corrosion ntawm cov hlau uas muaj zog heev thaum cov txheej txheem no, nws yog hu ua sacrificial anode cathodic tiv thaiv.

Kev tiv thaiv sab nraud cathodic tam sim no ua tiav los ntawm kev hloov lub peev xwm ntawm ib puag ncig ib puag ncig los ntawm kev siv hluav taws xob sab nraud, kom lub peev xwm ntawm cov cuab yeej tiv thaiv tseem qis dua li ntawm ib puag ncig ib puag ncig, yog li ua lub cathode ntawm tag nrho ib puag ncig. Nyob rau hauv txoj kev no, cov khoom siv los tiv thaiv yuav tsis corrode vim qhov poob ntawm electrons.

Txoj cai ua haujlwm

Siv tooj liab thiab txhuas alloys ua anodes thiab cov cuab yeej tiv thaiv raws li cathodes. Cov tooj liab ions tau los ntawm electrolyzing tooj liab anodes yog tshuaj lom thiab tsim ib puag ncig lom thaum tov nrog dej hiav txwv. Lub electrolytic aluminium anode tsim Al3 +, uas ua Al (OH) 3 nrog OH - tsim los ntawm cathode. Hom l (OH) 3 no encapsulates cov tooj liab ions tso tawm thiab ntws los ntawm cov txheej txheem tiv thaiv nrog dej hiav txwv. Nws muaj peev xwm adsorption siab thiab tuaj yeem nthuav tawm mus rau hauv cov cheeb tsam nrog cov dej hiav txwv qeeb qeeb uas cov kab mob hauv hiav txwv yuav nyob, inhibiting lawv txoj kev loj hlob. Thaum cov tooj liab aluminium anode system yog electrolyzed nyob rau hauv dej hiav txwv, ib txheej tuab ntawm calcium thiab magnesium yog tsim nyob rau hauv lub puab nto ntawm lub steel pipeline li cathode, thiab aluminium hydroxide colloid generated los ntawm electrolysis ntws nrog seawater, tsim ib tug tiv thaiv zaj duab xis nyob rau hauv lub puab phab ntsa ntawm lub raj xa dej. Cov calcium magnesium txheej thiab aluminium hydroxide colloidal zaj duab xis thaiv qhov kev nthuav dav ntawm cov pa oxygen, nce concentration polarization, thiab txo qis tus nqi corrosion, uas tuaj yeem ua tiav lub hom phiaj ntawm kev tiv thaiv fouling thiab tiv thaiv corrosion.