20.500.12556/RUL-158499 Optimizacija protikorozijske zaščite sintranih magnetov za mokre avtomobilske aplikacije diplomsko delo Optimization of anti-corrosion protection of sintered magnets for wet automotive applications diploma work Sintrani magneti na osnovi redkih zemelj (NdFeB) so ob hitrem tehnološkem razvoju postali v današnji dobi praktično nepogrešljivi. Njihova glavna slabost je, da zelo hitro korodirajo že na vlažnem zraku, izpostavljenost povišani temperaturi ali korozivnim medijem pa korozijske procese še pospeši. Korozijska zaščita je zato nujna in glavni faktor za doseganje želene življenjske dobe magneta. Namen diplomskega dela je bil preučiti katere protikorozijske zaščite bi bile tehnično še sprejemljive za delovanje magnetov v korozivnem mediju, v našem primeru konkretno za uporabo na rotorju, ki bi deloval v menjalniškem olju WF074-030, proizvajalca Fuchs. Pri tem smo upoštevali tudi cenovno sprejemljive rešitve in tako testirali šest različnih prevlek, tri kovinske galvansko nanešene prevleke (nematiran in matiran NiCuNi, CuNiNi), naparjeno kovinsko prevleko ZnAl in dve nekovinski (pasivacija in Everlube (hibridna prevleka)). Izvedli smo osnovne analize, kot so meritev mikrotrdote in debeline prevlek, ter meritve hrapavosti pred in po korozijskih testih (PCT test in test izpostavljenosti v menjalniškem olju). Poleg tega smo po testih izpostavljenosti naredili še mikroskopske analize površine in prereza vzorcev. Prišli smo do zaključka, da sta najbolj primerni zaščiti CuNiNi in nematirana NiCuNi. Sintered magnets based on rare earths (NdFeB) have become practically indispensable in today's era due to rapid technological development. Their main disadvantage is that they corrode very quickly, which is accelerated by exposure to elevated temperatures or corrosive medium. Corrosion protection is therefore necessary and the main factor for achieving the desired lifetime of the magnet. The aim of the thesis was to examine which anti-corrosion protections would still be technically acceptable for aggressive wet applications, in our case specifically for use on a rotor that would work in gear oil WF074-030, manufactured by Fuchs. We also considered affordable solutions and thus tested six different coatings, four metallic (NiCuNi in two versions, matted and unmatted, CuNiNi, and ZnAl) and two non-metallic (passivation and Everlube (hybrid coating)). We performed basic analyses, such as measurement of microhardness, coating thickness, roughness measurements before and after corrosion tests, such as the PCT test and the test in gear oil. In addition, after the exposure tests, microscopic analyzes of the surface and cross-section of the samples were performed. We have come to the conclusion that the most suitable protections are CuNiNi and unmatted NiCuNi. sintrani magneti NdFeB korozija protikorozijska zaščita korozijski procesi sintered magnets NdFeB (neodymium iron-boron) corrosion corrosion protection corrosion processes true false false T. Močnik Slovenski jezik Angleški jezik Diplomsko delo/naloga 2024-06-14 09:01:30 2024-06-14 09:01:32 2024-06-29 03:48:05 0000-00-00 00:00:00 2024 0 Ljubljana 0 Ljubljana X, 45 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 98317 198916867 20628.pdf 20628.pdf 1 BF788A5E4302D92EAD7ECCD8FA3F8AE8 ad504d5322e218f1da6b449d9e90799ea24277bc91d5d654e687b099af6e21d4 ef445dd1-2a1b-11ef-86fa-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=186155 Naravoslovnotehniška fakulteta 0 0 0