Abstract
Different parts of the coastal infrastructure that are made of metal are exposed to the varied conditions of the environment, which accelerates the corrosion of the materials and could, thus, increase pollution. Literature examines the degree of degradation of metal materials caused by corrosion and the resistance to the influences of the environment the materials are exposed to. The scientific discussion is based on the historical data regarding the key parameters of the sea and atmosphere and the changeable conditions caused by the sequences of ebb and flood tides that are typical for the Bay of Kotor. The paper presents the process of corrosion based on samples of a disc-like alloy of nickel and titanium (NiTi) and a steel fence, depending on the varied conditions of the environment and the length of exposure. The NiTi alloy was exposed to different influences of the sea and atmosphere for 6 months, while the steel fence was exposed continuously to the influences of the coastal atmosphere over a longer period of time. The chemical analysis of the particular parts of the materials and their corrosion phases was conducted by means of Energy Dispersive X-ray (EDX) semi-quantitative analysis. The results obtained from the EDX analysis were further revised by the method of linear regression and a multivariate method, principal component analysis (PCA), in order to define precisely the influences of a corrosive environment on the corrosion of the analysed NiTi alloy. The results acquired from the linear regression analysis prove that the NiTi alloy in every type of environment in coastal conditions corrodes by forming additional oxides. As expected, the corrosion caused by the air is the slowest and the most uniform, while the most intensive dissolution of nickel and titanium is in the sea, where the most heterogenous corrosive surface was registered as well. In relation to the linear regression analysis, the multivariate analysis registered the interdependence of corrosive parameters, as well as the effects of different types of corrosive environment on the degradation of the examined alloy.
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Acknowledgements
This paper is a result of the initial phase of the research of different aspects of the sea and atmosphere to the production and application of smart materials of Shape Memory Alloy in the Nautical industry. Project PROCHA-SMA is a part of the EUREKA Project which is jointly realised by the Faculty of Stomatology in Belgrade, Zlatarna Celje and the Faculty of Maritime Studies Kotor, University of Montenegro.
Funding
This research was funded by the BILATERAL PROJECTS Slovenia – Montenegro and Serbia – Montenegro (BI-ME/18-20-024) and EUREKA PROGRAM PROCHA-SMA E!13080 funded by Ministry of Science of the Republic of Montenegro.
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Ivošević, Š., Vastag, G., Majerič, P., Kovač, D., Rudolf, R. (2020). Analysis of the Corrosion Resistance of Different Metal Materials Exposed to Varied Conditions of the Environment in the Bay of Kotor. In: Joksimović, D., Đurović, M., Zonn, I.S., Kostianoy, A.G., Semenov, A.V. (eds) The Montenegrin Adriatic Coast. The Handbook of Environmental Chemistry, vol 110. Springer, Cham. https://doi.org/10.1007/698_2020_644
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