331 KB21 KB200020242014Halap, AkramPopović, MiljanaRadetić, TamaraRomhanji, EndreVaščić, Veselinštevilka:4letnik:48str. 479-483COBISSID:1071018ISSN:1580-2949URN:URN:NBN:SI:doc-NDIHYLE0enInštitut za kovinske materiale in tehnologijeMateriali in tehnologijealuminijeve zlitinealuminium alloycorrosionexfoliationjamicakorozijaluščenjepittingtermo-mehanska obdelavathermo-mechanical treatmentInfluence of the thermo-mechanical treatment on the exfoliation and pitting corrosion of an AA5083-type alloy| Vpliv termo-mehanske obdelave zlitine AA5083 na luščenje in jamičasto korozijo|Exfoliation and pitting corrosion were tested on an AA5083-type alloy sheet, after applying different thermo-mechanical treatments. Hot-rolled plates were laboratory cold rolled with 16-54 % reductions, and subsequently annealed for 2 h in the temperature range from 220 °C to 280 °C. The performed tests have shown that an unacceptable exfoliation and a corrosion susceptibility were developed after the 54 % deformation and low-temperature annealing at 220 °C. However, no severe exfoliation was observed after the cold rolling with low deformations, independent of the applied annealing temperature. The pitting corrosion was less agressive, and the highest degree of the pitting attack was not experienced for the tested alloy. A slight tendency to pitting was detected after the high cold deformation and high-temperature annealing for the samples with recrystallized but significantly flattened grain structuresLuščenje in jamičasta korozija sta bili preizkušeni na pločevini iz zlitine AA5083 po različnih termo-mehanskih obdelavah. Vroče valjane plošče so bile v laboratoriju hladno valjane z redukcijo 16-54 %, nato žarjene 2 h v območju temperature od 220 °C do 280 °C. Preizkusi so pokazali nesprejemljivo luščenje in občutljivost za korozijo po 54-odstotni deformaciji in nizki temperaturi žarjenja 220 °C. Močnejšega luščenja ni bilo opaziti po hladnem valjanju z majhno deformacijo, neodvisno od uporabljene temperature žarjenja. Jamičasta korozija je bila manj agresivna in močne jamičaste korozije ni bilo pri preizkušeni zlitini. Rahla tendenca po nastajanju jamic se je pokazala pri veliki hladni deformaciji in visoki temperaturi žarjenja pri vzorcih, ki so bili rekristalizirani in so imeli močno sploščeno strukturoTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije