期刊
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
卷 42, 期 11, 页码 2509-2519出版社
WILEY
DOI: 10.1111/ffe.13079
关键词
corrosion potential; corrosion-fatigue; electrochemical impedance spectroscopy; grade R4 steel; mooring chains
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [308126/2016-5, 310063/2018-3]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior [88881.118832/2016-01]
- Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa [UID/EMS/50022/2019, UID/QUI/00100/2013]
- Petrogal S.A./ISPG Brasil S.A. [GALP 09: (DSAM) GALP 09]
- FCT [UID/EMS/50022/2019, UID/QUI/00100/2013]
- CAPES [88881.118832/2016-01]
- Brazilian Council for Scientific and Technological Development-CNPq [308126/2016-5, 310063/2018-3]
- Agencia Nacional do Petroleo, Gas Natural e Biocombustiveis [19103-1]
The study deals with degradation and failure of mooring chains by the combined effect of corrosion and mechanical cyclic stresses on steel. Monitoring of the corrosion-fatigue damage was carried out using electrochemical assessment during the application of the cyclic mechanical loading on grade R4 martensitic steel specimens, immersed in artificial seawater. The spontaneous potential of the steel specimens and Electrochemical Impedance Spectroscopy measurements were performed to assess the corrosion degradation. Tests conducted under fully reversed stress-controlled loading have shown earlier failure caused by the corrosive environment when compared with the tests performed in ambient air. The corrosion potential response was used to identify the crack initiation and propagation stages.
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