Long-Term Marine Environment Exposure Effect on Butt-Welded Shipbuilding Steel
| Autor: | Josip Brnić, Florian Sedmak, Goran Vizentin, Marino Brčić, Goran Vukelić |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Heat-affected zone
Scanning electron microscope Naval architecture. Shipbuilding. Marine engineering VM1-989 020101 civil engineering Ocean Engineering GC1-1581 02 engineering and technology Welding Oceanography 0201 civil engineering Corrosion law.invention 0203 mechanical engineering marine environment effect law Base metal Water Science and Technology Civil and Structural Engineering Splash corrosion business.industry Metallurgy pitting AH 36 steel 020303 mechanical engineering & transports Shipbuilding Environmental science Seawater business |
| Zdroj: | Journal of Marine Science and Engineering Volume 9 Issue 5 Journal of Marine Science and Engineering, Vol 9, Iss 491, p 491 (2021) |
| ISSN: | 2077-1312 |
| DOI: | 10.3390/jmse9050491 |
| Popis: | Extreme environments, such as marine environments, have negative impacts on welded steel structures, causing corrosion, reduced structural integrity and, consequently, failures. That is why it is necessary to perform an experimental research sea exposure effect on such structures and materials. Research presented in this paper deals with the mechanical behavior of butt-welded specimens made of AH36 shipbuilding steel when they are exposed to a natural marine environment (water, seawater, sea splash) for prolonged periods (3, 6, 12, 24, and 36 months). The usual approach to such research is to perform accelerated tests in a simulated laboratory environment. Here, relative mass change due to corrosion over time is given along with calculated corrosion rates. Corroded surfaces of specimens were inspected using optical and scanning electron microscopy and comparison, based on the numbers and dimensions of the corrosion pits (diameter and depth) in the observed area. As a result, it can be concluded that exposure between 3 and 6 months shows significant influence on mass loss of specimens. Further, sea splash generally has the most negative impact on corrosion rate due to the combined chemical and mechanical degradation of material. Pit density is the highest at the base metal area of the specimen. The diameters of the corrosion pits grow over the time of exposure as the pits coalesce and join. Pit depths are generally greatest in the heat affected zone area of the specimen. |
| Databáze: | OpenAIRE |
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