Corrosion Resistance ntawm Pure Copper
Cov tooj liab ntshiab yog cov hlau tsis muaj -ferrous hlau nrog corrosion kuj zoo heev, uas yog ib qho ntawm nws qhov tseem ceeb tshaj qhov zoo dua li cov hluav taws xob siab thiab thermal conductivity. Nws yog dav siv nyob rau hauv vov tsev, kav dej, cua kub exchangers, marine hardware, hluav taws xob enclosures, thiab cov khoom siv zoo nkauj vim nws cov khoom ruaj khov thiab nws tus kheej -kev tiv thaiv mechanism.
Nyob rau hauv feem ntau tej yam ntuj tso thiab kev lag luam ib puag ncig, ntshiab tooj liab exhibits zoo heev durability.
Nws cov corrosion kuj feem ntau yog los ntawm cov zaj duab xis passive nto. Thaum raug huab cua, tshwj xeeb tshaj yog nyob rau hauv huab cua uas muaj oxygen thiab noo noo, tooj liab reacts nrog oxygen los ua ib tug nyias, ntom, thiab nrees adhered txheej ntawm tooj liab oxide (CuO thiab Cu₂O). Cov txheej no ua raws li lub cev thiab tshuaj tiv thaiv, tiv thaiv ntxiv oxidation thiab nkag mus ntawm corrosive media. Nyob rau lub sijhawm ntev, nyob rau hauv kev sib xyaw ua ke ntawm huab cua, dej nag, thiab carbon dioxide, qhov pib oxide zaj duab xis maj mam hloov mus rau hauv cov tooj liab carbonate lossis tooj liab sulfate patina. Cov patina ntsuab no ruaj khov, tsis yog-flaking, thiab nws tus kheej- kho, muab kev tiv thaiv ntev - rau cov khoom siv tooj liab. Qhov no yog vim li cas cov khoom qub qub tooj liab thiab niaj hnub tooj liab ru tsev tuaj yeem nyob ruaj khov rau ntau pua xyoo.
Hauv cov dej tshiab, xws li cov dej ntws, pas dej, thiab cov kav dej hauv tsev, cov tooj liab ntshiab ua tau zoo heev.
Nws yog resistant rau corrosion los ntawm nruab nrab los yog me ntsis alkaline dej thiab tsis yooj yim xeb los yog yaj. Vim li no, nws tau yog cov khoom siv zoo tshaj plaws rau cov kav dej, cov kav dej, thiab cov kav dej kub hloov mus ntev. Txawm li cas los xij, hauv dej acidic los yog siab - cov dej hardness nrog cov ions tshwj xeeb, tus nqi corrosion yuav nce me ntsis.
Nyob rau hauv atmospheric ib puag ncig, nrog rau cov nyob deb nroog, nroog, thiab me me industrial atmospheres, ntshiab tooj liab muaj zoo heev durability.
Nws tsis rhiab heev rau cov pa phem hauv huab cua. Txawm li cas los xij, nyob rau hauv cov huab cua muaj kuab paug siab heev nrog cov sulfur dioxide, hydrogen sulfide, lossis chloride ions, tus nqi corrosion yuav nrawm dua, thiab patina yuav dhau los ua kev tiv thaiv tsawg dua.
Nyob rau hauv dej hiav txwv thiab dej hiav txwv ib puag ncig, tooj liab muaj qhov zoo ntawm corrosion kuj, tab sis nws cuam tshuam los ntawm chloride ions.
Cov ntsiab lus chloride siab hauv dej hiav txwv tuaj yeem rhuav tshem cov zaj duab xis passive hauv zos, ua rau qee qhov kev xeb lossis pitting. Yog li ntawd, nyob rau hauv ncaj qha thiab ntev - daim ntawv thov marine lub sij hawm, ntshiab tooj liab feem ntau yog hloov los ntawm tooj liab alloys xws li txhuas tooj dag, cupronickel, thiab bronze, uas muaj zog dua thiab zoo dua nyob rau hauv lub zos corrosion kuj.
Cov tooj liab ntshiab tsis tiv taus cov kua qaub uas muaj zog, tshwj xeeb tshaj yog oxidizing acids xws li nitric acid thiab concentrated sulfuric acid, uas tuaj yeem yaj sai sai. Nws kuj tseem corrodes sai heev nyob rau hauv ammonia- muaj ib puag ncig vim ammonia tsim soluble complexes nrog tooj liab ions, rhuav tshem cov nto passivation zaj duab xis.
Raws li cov ntsiab lus, cov tooj liab ntshiab muaj qhov zoo tshaj plaws corrosion kuj nyob rau hauv nruab nrab cua, huv si dej, nyob deb nroog ib puag ncig, thiab tsis muaj zog alkaline tej yam kev mob, cia siab rau nws ruaj khov oxide thiab patina txheej rau nws tus kheej - tiv thaiv. Nws ua haujlwm nruab nrab hauv dej hiav txwv thiab tsis haum rau kev ua haujlwm ntev - nyob rau hauv cov kua qaub, ammoniacal, los yog hnyav heev hauv kev lag luam ib puag ncig. Rau cov ntawv thov uas xav tau kev tiv thaiv corrosion ntau dua, tooj liab alloys feem ntau yog xaiv los ntawm cov tooj liab ntshiab uas tsis muaj kev sib xyaw.
