Corrosion behavior of ferritic–martensitic steels SIMP and T91 in fast-flowing steam. (15th July 2021)

• Record Type: Journal Article
• Authors: Liu, Chao; Shen, Tielong; Yao, Cunfeng; Chang, Hailong; Wei, Kongfang; Niu, Lijuan; Ma, Zhiwei; Wang, Zhiguang
• Is Part Of: Corrosion science. Volume 187(2021)
• Publication Date: 2021-07-15
• Subjects: A. Steel -- B. XRD -- B. Raman spectroscopy -- B. SEM -- B. TEM -- C. Oxidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109474
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: SIMP and T91 followed the near-parabolic oxidation kinetics in 500 °C fast-flowing steam. Si modified SIMP displayed better steam corrosion resistance than T91. The fast-flowing rate increased the oxide rate and promoted the formation of Fe2 O3 . The formation of Fe2 O3 was related to dissolved oxygen, oxide rate and flow rate. No time effect on Fe2 O3 formation at 500 ℃ under 5 ppb concentration. Abstract: The oxidation behavior of ferritic–martensitic steels was investigated by exposure to 500 °C steam with a flow rate of 5 m/s. The oxidation kinetic curves followed near-parabolic rate equation and a type of Si modified steel SIMP displayed better oxidation resistance than T91. In the 5 m/s steam, the oxidation rate was significantly enhanced and the formation of hematite was also promoted at relatively low dissolved oxygen of 100 ppb. The results indicated that not only the alloy composition and dissolved oxygen but the flow rate played an important role in the corrosion behavior of ferritic–martensitic steels.