Corrosion Behavior of 304 Stainless Steel Bolt in Simulated Underwater Environment
In order to clarify the corrosion behavior of 304 stainless steel bolt in underwater environment (seawater and fresh water), the corrosion behavior of 304 stainless steel (304 SS) bolt in simulated underwater environment was studied in laboratory conditions. The effects of corrosion product films on...
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| Format: | Article |
| Language: | zho |
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Editorial Department of Materials Protection
2021-05-01
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| Series: | Cailiao Baohu |
| Subjects: | |
| Online Access: | http://www.mat-pro.com/fileup/1001-1560/PDF/20210508.pdf |
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| Summary: | In order to clarify the corrosion behavior of 304 stainless steel bolt in underwater environment (seawater and fresh water), the corrosion behavior of 304 stainless steel (304 SS) bolt in simulated underwater environment was studied in laboratory conditions. The effects of corrosion product films on corrosion behavior were monitored by weightlessness method, polarization curve and electrochemical AC impedance test. Scanning electron microscopy (SEM), X - ray diffraction (XRD) and Raman spectroscopy (RS) were used to analyze the morphology, composition and microstructure of the corrosion product films at different periods. Additionally, the depth of pitting pits on the bolt surface was measured with the help of scanning laser confocal microscopy (SLCM). Results showed that the corrosion rate of 304 stainless steel in seawater environment was about twice that in fresh water environment. The depth of corrosion pits in seawater was approximately 42.421 μm, while that in fresh water is 23.821 μm. Meanwhile, the corrosion rate of 304 stainless steel bolt in the simulated seawater and freshwater environment showed a trend of decreasing first and then increasing. During the corrosion cycle, α - FeOOH, Fe3O4 and a small amount of γ - FeOOH were found on the bolt surface. With the increase of corrosion time, the surface corrosion products increased and the corrosion resistance decreased. |
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| ISSN: | 1001-1560 |