Xov xwm

Aluminium yog lub hauv paus hlau thiab nws tam sim oxidizes thaum nws los rau hauv kev sib cuag nrog huab cua. Los ntawm cov tshuaj lom neeg pom, cov txheej txheem oxide tsim muaj kev ruaj khov dua li txhuas nws tus kheej thiab qhov no yog tus yuam sij rau kev tiv thaiv corrosion ntawm aluminium. Txawm li cas los xij, qhov ua tau zoo ntawm cov txheej no kuj tuaj yeem txo qis - los ntawm cov ntsiab lus alloying, piv txwv li. Nov yog qhov koj yuav tsum paub.

Rau cov ntawv thov uas pom qhov pom tsis tseem ceeb, cov txheej txheem oxide ntuj tuaj yeem muab kev tiv thaiv corrosion txaus. Tab sis yog tias cov txhuas yuav tsum tau pleev xim rau, sib koom ua ke, los yog siv nyob rau hauv ib puag ncig corrosive, kev kho mob ua ntej yog tsim nyog los tsim kom muaj qhov ruaj khov thiab ruaj khov. Cov txheej txheem ntawm aluminium oxide txheej tuaj yeem sib txawv, nyob ntawm qhov tsim, cov ntsiab lus alloying, thiab cov kab mob. Thaum dej muaj nyob rau hauv oxidation, cov dej siv lead ua kuj tseem muaj nyob rau hauv txheej oxide. Lub stability ntawm oxide txheej yog cuam tshuam los ntawm nws cov muaj pes tsawg leeg.

Aluminium oxide feem ntau ruaj khov nyob rau hauv ib thaj tsam ntawm pH ntawm 4 mus rau 9. Sab nraum qhov ntau, qhov kev pheej hmoo ntawm corrosion yog siab dua. Yog li ntawd, ob qho tib si acidic thiab alkaline kev daws teeb meem tuaj yeem siv los txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau nws, koj tuaj yeem siv cov tshuaj acidic thiab alkaline daws teeb meem.

Alloying cov ntsiab lus uas cuam tshuam rau corrosion

Dhau li ntawm cov khoom tiv thaiv ntawm oxide txheej, corrosion kuj ntawm aluminium alloys yog txiav txim los ntawm lub xub ntiag ntawm noble intermetallic hais. Nyob rau hauv lub xub ntiag ntawm cov tshuaj electrolyte, xws li dej los yog ntsev, corrosion tuaj yeem tshwm sim, nrog rau cov khoom zoo li cathodes thiab cov cheeb tsam ib puag ncig ua anodes qhov twg cov txhuas yaj.

Txawm hais tias cov khoom me me ntawm cov ntsiab lus tseem ceeb tuaj yeem ua rau muaj kev zoo siab vim yog kev xaiv ntawm aluminium rau ntawm lawv qhov chaw. Cov khoom uas muaj cov hlau ua kom txo tau qhov corrosion kuj, thaum tooj liab kuj txo qis corrosion kuj. Qhov siab dua ntawm impurities, zoo li txhuas, ntawm cov ciam teb nplej kuj tseem cuam tshuam rau corrosion kuj.

Corrosion kuj nyob rau hauv 5000 thiab 6000 series txhuas alloys

Aluminium alloys los ntawm 5000 thiab 6000 series feem ntau muaj qis qis ntawm alloying ntsiab lus thiab intermetallic hais, ua rau muaj kev tiv thaiv corrosion kuj. High-strength 2000-series alloys, feem ntau siv nyob rau hauv aviation kev lag luam, feem ntau muaj ib tug nyias cladding ntawm ntshiab txhuas los tiv thaiv corrosion.

Cov khoom siv rov ua dua tshiab zoo li muaj cov kab ke ntau ntxiv, ua rau lawv yooj yim dua rau corrosion. Txawm li cas los xij, qhov sib txawv ntawm corrosion kuj ntawm cov alloys sib txawv, thiab txawm nyob rau hauv tib lub alloy, vim yog cov txheej txheem ntau lawm thiab kev kho cua sov, tuaj yeem ua ntau dua qhov tshwm sim los ntawm cov kab lus ib leeg.

Yog li ntawd, nws yog ib qho tseem ceeb kom nrhiav tau kev paub los ntawm koj tus neeg muag khoom, tshwj xeeb tshaj yog tias corrosion kuj tseem ceeb heev rau koj cov khoom. Aluminium tsis yog cov khoom sib xws, thiab kev nkag siab txog nws cov khoom tshwj xeeb yog qhov tseem ceeb hauv kev xaiv cov khoom siv txhuas tsim nyog rau koj cov kev xav tau.

Xav tias dawb rautiv tauj pebyog koj xav paub ntxiv.