Passive Oxide Layer: Copper rods ib txwm tsim ib txheej oxide nyias ntawm lawv qhov chaw thaum raug huab cua. Cov oxide txheej no, feem ntau yog tsim los ntawm cuprous oxide (Cu2O) thiab cupric oxide (CuO), ua raws li kev tiv thaiv tiv thaiv ntxiv oxidation thiab corrosion. Cov oxide txheej inhibits qhov diffusion ntawm corrosive agents, xws li dej thiab oxygen, ntawm lub hauv paus tooj liab, yog li txo tus nqi ntawm corrosion.
Kev Kho Tus Kheej Muaj Peev Xwm: Nyob rau hauv lub xub ntiag ntawm oxygen thiab noo noo, oxide txheej ntawm tooj liab rods tuaj yeem cuam tshuam cov tshuaj lom neeg tsis tu ncua, tso cai rau nws kho tus kheej yog tias puas. Thaum muaj kev khawb los yog qhov chaw xeb tshwm sim, cov tooj liab raug cuam tshuam nrog oxygen thiab noo noo kom rov tsim cov txheej txheem oxide tiv thaiv. Cov txheej txheem kho tus kheej no pab tswj kev tiv thaiv corrosion ntawm tooj liab pas nrig thaum lub sijhawm.
Tsawg Reactivity: tooj liab muaj qhov tsis tshua muaj qhov cuam tshuam nrog ntau cov tshuaj tiv thaiv kab mob xws li dej, huab cua hauv huab cua, thiab feem ntau cov organic tebchaw. Qhov no tsis tshua muaj reactivity yog vim tooj liab txoj hauj lwm nyob rau hauv lub electrochemical series, ua rau nws tsis tshua muaj corrosion piv rau lwm yam hlau. Tooj liab tsis tshua muaj reactivity xyuas kom meej tias nws nyob ruaj khov thiab tiv taus degradation nyob rau hauv ntau qhov chaw.
pH ruaj khov: tooj liab rods pom zoo tiv thaiv corrosion nyob rau hauv ob qho tib si acidic thiab alkaline ib puag ncig. Copper lub corrosion kuj yog tshwj xeeb tshaj yog tseem ceeb nyob rau hauv me ntsis acidic tej yam kev mob, raws li nws tsim ruaj khov complexes nrog acid ions, rendering lawv tsawg corrosive rau tooj liab. Txawm li cas los xij, nyob rau hauv cov kua qaub los yog alkaline heev, qhov corrosion kuj ntawm tooj liab tuaj yeem cuam tshuam.
Alloying Effects: Qhov sib ntxiv ntawm qee cov ntsiab lus alloying tuaj yeem txhim kho corrosion kuj ntawm tooj liab rods. Piv txwv li, tooj liab alloys xws li bronze (tooj liab-tin) thiab tooj dag (tooj liab-zinc) muab kev txhim kho corrosion kuj piv rau cov tooj liab ntshiab. Cov ntsiab lus alloying tsim cov theem tiv thaiv lossis txo cov reactivity ntawm tooj liab, txhim kho nws cov kev tiv thaiv rau corrosive ib puag ncig.
Environmental Factors: Thaum tooj liab rods pom zoo corrosion kuj, qhov chaw tshwj xeeb uas lawv tau siv tuaj yeem cuam tshuam lawv cov kev ua tau zoo. Cov yam ntxwv xws li cov av noo, qhov kub thiab txias, muaj cov tshuaj aggressive, thiab raug rau marine los yog industrial cua yuav cuam tshuam rau corrosion kuj ntawm tooj liab rods. Kev xaiv zoo ntawm cov tooj liab alloys lossis cov txheej tiv thaiv tuaj yeem txo cov kev pheej hmoo corrosion hauv cov cheeb tsam nyuaj.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias thaum tooj liab rods muaj kev tiv thaiv corrosion heev, lawv tseem tuaj yeem raug rau qee qhov chaw corrosive lossis cov kab mob tshwj xeeb. Yog li ntawd, nws yog ib qho tseem ceeb rau kev ntsuam xyuas cov kev thov tshwj xeeb thiab sab laj cov qauv tsim nyog lossis cov txheej txheem los xyuas kom muaj kev tiv thaiv corrosion tsim nyog, xws li siv cov coatings tiv thaiv corrosion los yog xaiv cov tooj liab uas tsim nyog.
