1. Puas yog T2 tooj liab xeb?
xebtshwj xeeb yog hais txog cov hlau oxide (Fe₂O₃·nH₂O) tsim thaum hlau los yog hlau corrodes. Txij li thaum T2 tooj liab (C11000 hauv ASTM tus qauv, siab -purity unalloyed tooj liab nrog ntau dua lossis sib npaug rau 99.90% Cu cov ntsiab lus) tsis muaj hlau, nwstsis "rust" nyob rau hauv qhov kev txiav txim nruj.
Txawm li cas los xij, T2 tooj liab yogsusceptible rau oxidation thiab corrosionnyob rau hauv ib puag ncig tshwj xeeb, tsim cov yeeb yaj kiab nto nrog cov sib txawv thiab xim. Cov yeeb yaj kiab no tsis yog xeb tab sis tooj liab oxides lossis tooj liab ntsev.
2. Qhov tseem ceeb Oxidation / Corrosion Reactions ntawm T2 Copper
Pib oxidation (dry air): Hauv huab cua huv, qhuav ntawm chav tsev kub, T2 tooj liab reacts maj mam nrog oxygen (O₂) los ua nyias, ntom.Cub oxide (Cu₂O)zaj duab xis. Cov yeeb yaj kiab no yog xim liab -xim av (zoo ib yam li cov xim ntawm tooj liab nws tus kheej) thiab ua raws li kev tiv thaiv kev tiv thaiv, tiv thaiv oxidation ntxiv ntawm cov hlau hauv qab.
Cov tshuaj tiv thaiv: 4Cu + O₂ → 2Cu₂O
Atmospheric corrosion (cov huab cua ntub nrog cov pa phem): Hauv qhov chaw ntub dej uas muaj cov pa roj carbon dioxide (CO₂), sulfur dioxide (SO₂), lossis chloride ions (Cl⁻), zaj duab xis saum npoo hloov mus rau hauvtooj liab carbonate (Cu₂(OH)₂CO₃)los yogyooj yim tooj liab sulfate (Cu₂(OH)₂SO₄). Cov tebchaw no tsim cov patina ntsuab (xws li, cov txheej ntsuab ntawm cov khoom qub tooj liab lossis cov ru tsev tooj liab), uas kuj tseem ruaj khov thiab tiv thaiv yog tias tsis zoo.
Corrosion hnyav (qhov chaw nruj heev): Nyob rau hauv ib puag ncig nrog acidity siab, siab chloride concentrations, los yog ammonia (NH₃), cov yeeb yaj kiab tiv thaiv raug puas tsuaj, ua raupitting corrosionlos yogdezincification-zoo li corrosion(txawm hais tias T2 yog unalloyed, chloride ions tuaj yeem nkag mus rau hauv zaj duab xis thiab tua lub hauv paus hlau). Qhov no ua rau lub ntsej muag pitting, discoloration, lossis txawm tias poob ntawm cov khoom siv kho tshuab.
3. Ib puag ncig qhov twg T2 tooj liab tuaj yeem ua rau Oxidation / Corrosion
High humidity ib puag ncig: Relative humidity >60% (piv txwv li, thaj chaw ntug dej hiav txwv, hav zoov, lossis qhov chaw tsis zoo nyob sab hauv tsev) muab cov dej noo xav tau rau cov tshuaj tiv thaiv electrochemical corrosion.
Cov huab cua phem:
Cov cheeb tsam uas muaj SO₂ siab (los ntawm cov thee combustion, smelting) los yog NOₓ (los ntawm lub tsheb exhausts), uas tsim acidic aerosols uas ua rau kom cov zaj duab xis tawg.
Cov cheeb tsam ntug dej hiav txwv uas muaj Cl⁻ siab ntau (los ntawm cov dej hiav txwv tsuag), uas ua rau pitting corrosion (Cl⁻ ions yog corrosive heev rau tooj liab oxide zaj duab xis).
Acid los yog alkaline daws: Kev sib cuag ncaj qha nrog cov kua qaub (xws li sulfuric acid, hydrochloric acid) lossis muaj zog alkalis (piv txwv li, sodium hydroxide) dissolves cov yeeb yaj kiab tiv thaiv oxide, ua rau kom muaj kev sib haum xeeb sai.
Ammonia- muaj ib puag ncig: Ammonia (NH₃) lossis ammonium ntsev (xws li ammonium chloride) hnov mob nrog tooj liab los ua cov tooj liab soluble- ammonia complexes ([Cu(NH₃)₄]²⁺), uas ua kom cov yeeb yaj kiab tiv thaiv tag nrho thiab ua rau muaj kev xeb loj heev (feem ntau hauv cov nroj tsuag tshuaj lossis chaw ua liaj ua teb).
Siab - qhov kub thiab txias: Temperatures >150℃nrawm cov tshuaj tiv thaiv ntawm tooj liab thiab oxygen, tsim ib txheej tuab, tsawg adherent oxide txheej (CuO, xim dub) uas tev tawm yooj yim, nthuav tawm cov hlau tshiab kom ntxiv oxidation.
4. Qhov tseem ceeb Takeaways
T2 toojtsis xeb(tsis muaj cov ntsiab lus hlau) tab sis nws nquagoxidation thiab corrosionnyob rau hauv ib puag ncig tshwj xeeb, tsim cov yeeb yaj kiab tiv thaiv (xim liab-xim av Cu₂O lossis ntsuab patina) lossis cov khoom puas tsuaj.
Qhov chaw nruj heev rau T2 tooj liab muaj xws li cov av noo siab, ntug hiav txwv dej / kev lag luam huab cua (Cl⁻, SO₂), acidic / alkaline daws, ammonia-ib puag ncig, thiab kub siab.
Rau cov ntawv thov uas yuav tsum tau ntev- lub sij hawm corrosion kuj (piv txwv li, marine hardware, chemical khoom), T2 tooj liab yuav tsum tau kho deg (xws li, npib tsib xee plating, passivation) los yog yuav tsum tau hloov nrog corrosion-tshuaj tooj liab alloys (xws li, tooj liab-nickel alloys xws li C70600).
