A study on the initial corrosion behavior of carbon steel exposed to outdoor wet-dry cyclic condition

• Published in: Corrosion science Vol. 88; pp. 89 - 100
• Main Authors: Han, Wei, Pan, Chen, Wang, Zhenyao, Yu, Guocai
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.11.2014; Elsevier
• Subjects: A. Carbon steel; Applied sciences; B. SEM; B. Weight loss; C. Atmospheric corrosion; Corrosion; Corrosion environments; Exact sciences and technology; Metals. Metallurgy; B. SEM; A. Carbon steel; C. Atmospheric corrosion; B. Weight loss; Scanning electron microscopy; Mass loss; Dry; Carbon steel; Atmospheric corrosion
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2014.07.031

•There is a good correlation between outdoor accelerated test and field exposure.•A transition from corrosion acceleration to deceleration exists in initial stage.•The corrosion kinetics under both conditions follow empirical equation D=Atn. The initial corrosion behavior of carbon steel subjected to outdoor wet-dry cyclic exposure and exposure under natural environments have been investigated. The weight loss results indicate a transition from corrosion acceleration to deceleration during the early stage of corrosion of carbon steel under both conditions. The corrosion kinetics under both conditions follow empirical equation D=Atn. Outdoor wet-dry cyclic exposure significantly promoted the initiation but the rate of corrosion was about three times as fast. The morphology of corrosion surfaces and cross-section of rust layer have been examined using SEM and the compositions have been analyzed using XRD and EPMA.