Morphology and corrosion properties PVD Cr-N coatings deposited on aluminium alloysKek-Merl, Darja (Avtor) Milošev, Ingrid (Avtor) Panjan, Peter (Avtor) Zupanič, Franc (Avtor) , Inštitut za kovinske materiale in tehnologije (Lastnik avtorskih pravic) Al-alloyscorrosion propertiesCrN filmsFIBPVD coatingsThe 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.20112017-03-17 12:10:50Znanstveno delo65202ISSN: 1580-2949UDK: 669.71:620.193OceCobissID: 106193664COBISS_ID: 25468199ISSN pri članku: 1580-2949NUK URN: URN:SI:UM:DK:LAFT0NVJsl