Possible measures to reduce marine microbiologically influenced corrosion

V zadnjem času se zaradi okoljskega zavedanja in vse večjih finančnih izgub veliko pozornosti posveča vplivu morske mikrobiološke korozije. Le-ta se pojavi, ko na potopljeno površino prilepljeni organizmi tvorijo biofilm, ki z razjedanjem povzroča korozijske napade. Pri blaženju tega pojava so učinkovitejše starejše metode, med katere sodi zaščita z bioaktivnimi sredstvi, ki mikroorganizme uniči z izpuščanjem strupenih snovi. Ne glede na to pa se iščejo okolju prijaznejše alternative. Na tem področju pa razen laboratorijskih uspehov še ni prišlo do praktično izvedljivih rezultatov. V zaključni nalogi smo ugotavljali, kako samopolirni premaz proti obraščanju vpliva na preprečevanje morske mikrobiološke korozije na aluminijevi zlitini 4006 in maloogljičnem jeklu DD11-CAT_A EN10111-2008. Naloga obravnava in ocenjuje razsežnost pojava biofilma, korozije in njenih produktov ter spremembe mase vzorcev. Rezultati kažejo, da je premaz učinkovit, za optimalno delovanje pa je potrebna popolna prekrivnost površine. Korozijska hitrost nepremazanih aluminijevih površin je po enem tednu znašala 0,174 grama na leto, po treh tednih pa 0,406 grama na leto. Vzorci iz nizkoogljičnega jekla so po enem tednu imeli hitrost korozije 5,04 grama na leto, po treh tednih pa 5,33 grama na leto.Recently, due to environmental awareness and increasing financial losses, much attention has been paid to the impact of marine microbiological corrosion. Only this occurs when organisms stuck to the submerged surface form a biofilm, which causes corrosion attacks by erosion. In mitigating this phenomenon, older methods are more effective, including protection with bioactive agents, which destroy microorganisms by releasing toxic substances. Regardless, more environmentally friendly alternatives are being sought. Apart from laboratory successes, there have not yet been any practically feasible results in this area. In the final assignment, we determined how the self-polishing antifouling coating affects the prevention of marine microbiological corrosion on aluminum alloy 4006 and mild steel DD11-CAT_A EN10111-2008. The assignment examines and evaluates the extent of the occurrence of biofilm, corrosion and its products, and changes in the mass of the samples. The results show that the coating is effective, but full surface coverage is required for optimal performance. The corrosion rate of uncoated aluminum surfaces was 0,174 grams per year after one week and 0,406 grams per year after three weeks. The mild steel samples had a corrosion rate of 5,04 grams per year after one week, and 5,33 grams per year after three weeks