Effect of silicon on the oxidation resistance of 9 wt.% Cr heat resistance steels in 550 °C lead-bismuth eutectic. (October 2016)

• Record Type: Journal Article
• Authors: Wang, Jian; Lu, Shanping; Rong, Lijian; Li, Dianzhong; Li, Yiyi
• Is Part Of: Corrosion science. Volume 111(2016)
• Page Start: 13
• Page End: 25
• Publication Date: 2016-10
• Subjects: A. Steel -- B. EPMA -- B. TEM -- B. XRD -- C. Oxidation -- C. Welding; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2016.04.020
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: The oxide film presents a three-layers structure. The oxidation is the diffusion controlled process and fits for the parabolic law. Si improves the oxidation resistance for 9 wt.% Cr steel in lead-bismuth eutectic. The continuous dense Cr2 O3 and SiO2 mixture layer improves the oxidation resistance. Abstract: The oxidation resistance of 9 wt.% Cr heat resistance steel with silicon content ranging from 0 to 1.36 wt.% in 550 °C lead-bismuth eutectic was investigated. The silicon content had little influence on the macro-structure of the oxide film. The oxide film presented a three-layers structure. The outer layer was PbO·xFe2 O3 and Fe3 O4 while the inner layer was mainly FeCr2 O4 . The formation of thin continuous dense Cr2 O3 and SiO2 mixture layer impeded the growth of Fe-rich oxide film, which improved the oxidation resistance in high silicon content. A oxidation process model was put forward to well explain this phenomenon.