Aluminium yuav tsis xeb lossis corrode nyob rau hauv feem ntau cov kev mob ntawm kev siv thiab muaj ib qho siab corrosion tsis kam. Thaum lub npoo txhuas tau raug rau cov huab cua, nws yuav ua daim ntawv invisible tam sim ntawd (al2o3o) los tiv thaiv kev tawm tsam ntxiv ntawm cov hlau.
Qhov kev tiv thaiv tus kheej no ua rau aluminium heev corrosion resistant. Tshwj tsis yog tau txais qee yam tshuaj lossis cov xwm txheej uas ua kom lub cev tiv thaiv oxide txheej, cov hlau tseem muaj kev tiv thaiv corrosion txaus. Txawm nyob rau hauv cov chaw muaj kev lag luam uas lwm cov hlau feem ntau corroded, txhuas muaj kev tiv thaiv zoo.
Qee cov alloys alloys tsis yog raws li corrosion tiv taus lwm tus, tshwj xeeb tshaj yog qee qhov siab-zog aluminium alloys. 5xxX aluminium cov ntawv txheeb tau paub zoo marine qib aluminium nplooj ntawv zoo li 5052, 5083 thiab 5083 aluminium daim ntawv.
Corrosion tsis kam ntawm txhuas thiab aluminium alloys
1xxx series: nrog purity tshaj 99. 00}}%, nws muaj kev tiv taus corrosion.
2xxx series: tooj yog lub ntsiab alloying keeb. Cov alloys tsis muaj cov zoo corrosion tsis zoo li feem ntau aluminium alloys, thiab nyob rau hauv qee qhov kev mob, lawv yuav raug nyob rau hauv kev txhim kho corrosion.
3xxx series: manganese yog lub ntsiab alloying nyob rau hauv no alloy. Lawv muaj cov siab tiv thaiv. Lawv corrosion tsis kam nyob rau hauv cov huab cua zoo ib yam li ntawm kev lag luam ntshiab txhuas thiab tib yam li ntshiab txhuas nyob hauv seawater.
4XXX Series: silicon yog lub ntsiab lus tseem ceeb, tab sis silicon muaj qhov cuam tshuam tsawg tshaj ntawm cov xeb ntawd ntawm cov alloys. Qhov no yog vim qhov tseeb tias silicon hais yog cov polarized heev, ua rau muaj qis dua corrosion tam sim no ceev.
5xxx series: nws tau zoo heev corrosion tsis kam. Alloy 5052 muaj cov zoo corrosion tsis kam nyob rau hauv dej tshiab, tab sis tsis zoo li 5083 hauv dej hiav txwv. Txais tos kom paub ntau ntxiv txog Alloy 5052 qhov khoom ntawm peb.
6XXX Series: lub 6xxx series muaj kwv yees li qee feem ntawm silicon thiab MAXINGALIZE, uas ua rau nws ua kom sov thiab muaj zoo corrosies tsis kam. Nws cov qib tseem yog 6061 alloy.
Corrosion ntawm txhuas thiab aluminium alloys
Pitting corrosion: rau txhuas, feem ntau pitting corrosion yog hatide ions (cl
Galvanic corrosion: Aluminium thiab nws cov aluminium tsis ua poob vim galvanic corrosion, yog li tsis txhob hu rau ntawm txhuas thiab ntau hlau hlau. Yog tias qhov kev sib cuag zoo li no, kev tiv thaiv kev tiv thaiv yuav tsum tau coj los txo qis kev corrosion ntawm txhuas. Nyob rau hauv ntau qhov chaw, txhuas yuav nyob rau hauv kev sib cuag nrog chromium lossis stainless hlau nrog tsuas yog me ntsis nrawm nrawm corrosion.
Intergranular corrosion yog xaiv corrosion ntawm cov ciaj ciam av lossis thaj chaw ib sab, tab sis tsis muaj qhov sib luag ntawm cov nplej lawv tus kheej. Intergranular corrosion yog tshwm sim los ntawm cov peev xwm sib txawv ntawm cov nplej thaj tsam thiab thaj chaw uas nyob ib sab.
Yuav aluminium xeb hauv cov ntsev dej
Aluminium yuav xeb hauv cov dej ntsev vim tias cov ntsev ntau muaj ntau cov tshuaj pleev xim rau sab nraud ntawm txhuas, ua rau pitting thiab intergranular corrosion.