Hot corrosion behavior of Super304H coated Na2SO4-25%NaCl film

被引：0
作者：
Li P. [1 ]
Qin P. [1 ]
Zhao J. [1 ]
Li T.-J. [1 ]
Pang S.-J. [1 ]
机构：
[1] College of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, Liaoning
来源：
Cailiao Gongcheng/Journal of Materials Engineering | 2016年 / 44卷 / 02期
关键词：
Chlorination; Hot corrosion; Oxidation; Sulfuration;
D O I：
10.11868/j.issn.1001-4381.2016.02.011
中图分类号：
学科分类号：
摘要：
Corrosion kinetics curves of Super304H coated with Na2SO4-25%NaCl at 650℃ and 750℃ in the air were investigated by applying weight analysis method. The corrosion product, cross-section appearance and elements distribution were analyzed by XRD, SEM equipped with EDS, and EPMA. The results show that the corrosion kinetics curves at 650℃and 750℃are in parabolic trend. A two-layered complex oxide film with the outer Fe rich oxide layer containing CuFe2O4 and inner Cr2O3 rich layer and the poor Cr, rich Ni corrosion affected zone containing voids; Increasing the temperature or prolonging the corrosion time can result in the separation or even spalling of oxide film from the base alloy, and porosity density increases in the corrosion affected zone, cracks propagate to the base metal. Analysis shows that the selective oxidation occurs at the early corrosion stage and forms multi-layer oxide film; the molten salts destroy the integrity of the oxide film and accelerate the interaction among oxidation, chlorination and sulfuration during the corrosion processing, which results in the severe internal oxidation and sulfuration. © 2016, Beijing Institute of Aeronautical Materials (BIAM). All right reserved.
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页码：69 / 74
页数：5
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