The roles of Al addition and heat treatment temperature on chloride corrosion of 9Cr alloy steel

被引：16
作者：
Chen, Runnong [1 ,2 ,3 ]
Li, Zhaodong [1 ]
Zhang, Qifu [2 ]
Li, Xiaogang [3 ]
机构：
[1] Cent Iron & Steel Res Inst, Dept Struct Steels, Beijing 100081, Peoples R China
[2] Cent Iron & Steel Res Inst, Natl Engn Lab Adv Coating Technol Met, Beijing 100081, Peoples R China
[3] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China
来源：
CORROSION SCIENCE | 2022年 / 209卷
关键词：
9Cr alloy steel; Al addition; Microstructures; Chloride corrosion; Corrosion mechanism; DUPLEX STAINLESS-STEEL; WEATHERING STEEL; LOCALIZED CORROSION; PROTECTIVE ABILITY; RESISTANCE; BEHAVIOR; CR; CARBIDES; TRANSFORMATION; PRECIPITATION;
D O I：
10.1016/j.corsci.2022.110784
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of 0.7% Al and heat treatment temperatures on chloride corrosion of 9Cr alloy steel were investigated through potentiodynamic polarization measurement and salt spray test. Al promoted the formation of Al2O3-rich inclusions and AlN, thus reducing the pitting potential at initial stage. However, Al addition reduced weight loss after longer time by optimizing the alpha/gamma * value, compactness and element distribution of rust layer. The mechanism of corrosion resistance changing with heat treatment temperature was understood from the decrease in the pitting resistance equivalent number caused by (Fe, Cr)23C6 precipitation and the microgalvanic corrosion between fresh martensite and tempered martensite/ferrite.
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页数：14
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