20.500.12556/DKUM-65202 Morphology and corrosion properties PVD Cr-N coatings deposited on aluminium alloys Morfologija in korozijske lastnosti CrN PVD-prevlek, nanesenih na aluminijeve zlitine The attempt to find an alternative coating for corrosion protection of Al- alloys was made. PVD coatings are one of the possible alternatives for replacement of ecological unfriendly chromate coatings. Chromium-nitride (Cr-N) and Ni/Cr-N coatings were sputtered on aluminium substrates (AA7075 and cladded AA2024). Surface and sub-surface characterizations were performed by AFM and SEM. Special attention was given to defects incorporated into coatings, since they play important role in the corrosion protection of the coating/substrate systems. The cross-sections through the typical defects were performed by ion beam milling incorporated into the SEM. The Vickers hardness of the Cr-N with and without layer of Ni on both substrates was determined. After the coatings deposition, the values of Vickers hardness (10 mN load) increase for 10 to 100-fold compared to the substrates. The corrosion behaviour of Cr-N and Ni/Cr-N thin films was investigated in near neutral 0.1 M solution of NaCl using potentiodynamics electrochemical measurement. Cr-N and Ni/Cr-N coatings shift the corrosion potentials to more positive values. The best corrosion resistance among the tested coating/substrate systems were found for Ni/Cr-N on AA7075 substrate. Ena od možnih alternativ za zamenjavo ekološko neprijaznih kromatnih prevlek na aluminijevih zlitinah so PVD-prevleke. V prispevku opisujemo pripravo in karakterizacijo prevlek Cr-N in Ni/Cr-N na aluminijeve podlage (AA7075 in AA2024). Površinsko in podpovršinsko karakterizacijo CrN-prevlek smo izvedli z vrstično elektronsko mikroskopijo (SEM) in mikroskopom na atomsko silo (AFM). Posebna pozornost je bila namenjena karakterizaciji defektov v prevlekah, saj igrajo pomembno vlogo pri korozijski zaščiti sistema prevleka/podlaga. Defekte smo karakterizirali z vrstičnim mikroskopom (SEM), ki je dodatno opremljen s fokusiranim ionskim curkom (FIB) za odstranjevanje materiala. Določili smo trdoto prevlek po Vickersu na obeh vrstah aluminijevih podlag. Korozijske lastnosti prevlek smo merili v 0,1 M raztopini NaCl s potenciodinamskimi krivuljami. Cr-N- in Ni/Cr-N-prevleke premaknejo korozijski potencial proti pozitivnim vrednostim. Zaščita aluminijevih zlitin je boljša z dvojno prevleko Ni/CrN kot samo s prevleko CrN. Al-alloys corrosion properties CrN films FIB PVD coatings aluminijeve zlitine korozija PVD-prevleke true false true Angleški jezik Slovenski jezik Znanstveno delo 2017-03-17 12:10:50 2017-03-17 12:20:35 2022-07-07 03:08:39 2019-07-11 15:10:46 2011 0 0 str. 593-597 št. 6 Letn. 45 nov.-dec. 2011 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1580-2949 669.71:620.193 106193664 25468199 1580-2949 URN:SI:UM:DK:LAFT0NVJ Materiali_in_Tehnologije_2011_Merl_et_al._MORPHOLOGY_AND_CORROSION_PROPERTIES_PVD_Cr-N_COATINGS_DEPOSITED_ON_ALUMINIUM_ALLOYS.pdf Materiali_in_Tehnologije_2011_Merl_et_al._MORPHOLOGY_AND_CORROSION_PROPERTIES_PVD_Cr-N_COATINGS_DEPOSITED_ON_ALUMINIUM_ALLOYS.pdf 1 E4499D5D9DAB524DEFF96081874816BE e5c27f8ca1523f1b606748ae9d9a974195b803819aa6cd9b0783c9933dd1b5e3 ff4c1070-7c0d-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=109934 http://mit.imt.si/Revija/izvodi/mit116/kekmerl.pdf 1 https://dk.um.si/Dokument.php?lang=slv&id=109933 Fakulteta za strojništvo 0 0 0