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Zaštita materijala
2015, vol. 56, br. 1, str. 47-51
jezik rada: engleski
vrsta rada: izvorni naučni članak
objavljeno: 29/10/2015
doi: 10.5937/ZasMat1501047M
Utjecaj koncentracije NaCl na piting koroziju ekstrudirane Al-Mg-Si legure AA6060
aUniversity of Zagreb Faculty of Metallurgy, Sisak, Croatia
bUniversity of Split Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Split, Croatia

Sažetak

Ekstrudirane Al-Mg-Si legure (serija AA6xxx) najčešće se koriste u konstrukcijske svrhe zahvaljujući prihvatljivim mehaničkim i korozijskim svojstvima. Spontano formirani sloj aluminijeva oksida na površini Al i Al-legura štiti od korozijskih oštećenja u neutralnim medijima, ali u otopinama koje sadrže kloride dolazi do proboja takvog tankog i kompaktnog pasivnog filma. Kao posljedica tog procesa, nastaju na površini lokalna oštećenja i dolazi do pojave jamičaste korozije- pitinga. U ovom je radu proučavano korozijsko ponašanje komercijalne ekstrudirane Al-Mg-Si legure AA6060 u otopinama NaCl različite koncentracije, metodom anodne potenciodinamičke polarizacije u deaeriranim uvjetima pri sobnoj temperaturi. Pokazalo se da sklonost lokalnoj koroziji raste s koncentracijom kloridnih iona i ovisi o katodnim mikrokonstituentima u ekstrudiranoj Al-Mg-Si leguri.

Ključne reči

piting korozija; komercijalna Al-Mg-Si legura; deaerirana NaCl

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