High Temperature Corrosion of Water Wall Materials T23 and T24 in Simulated Furnace Atmospheres

Chin.J.Chem.Eng. ›› 2012, Vol. 20 ›› Issue (4): 814-822.

• MATERIALS AND PRODUCT ENGINEERING • Previous Articles

High Temperature Corrosion of Water Wall Materials T23 and T24 in Simulated Furnace Atmospheres

ZHAO Qinxin¹, ZHANG Zhixiang², CHENG Dingnan¹, WANG Yungang¹, DENG Xiang¹

1. Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China;
2. Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710032, China

Received:2011-04-15 Revised:2012-03-13 Online:2012-09-15 Published:2012-08-28
Supported by:
Supported by the “Twelfth Five-Year” National Science and Technology Support Program (2011BAK06B04)

High Temperature Corrosion of Water Wall Materials T23 and T24 in Simulated Furnace Atmospheres

赵钦新¹, 张知翔², 成丁南¹, 王云刚¹, 邓翔¹

1. Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China;
2. Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710032, China

通讯作者: ZHANG Zhixiang, E-mail:zhaoqx@mail.xjtu.edu.cn
基金资助:
Supported by the “Twelfth Five-Year” National Science and Technology Support Program (2011BAK06B04)

Abstract

Abstract: Candidate materials for water wall of supercritical and ultra-supercritical utility boilers,T23 and T24,were chosen as the experimental samples and exposed to oxidizing atmosphere,reducing atmosphere and oxidizing/reducing alternating atmosphere separately.The corrosion temperature was 450-550℃.The effects of oxygen content and temperature on the corrosion in reducing atmosphere and alternating atmosphere were investigated.The scanning electron microscope(SEM) and energy dispersive spectrometer(EDS) were used to examine the corroded samples.The results show that the corrosion kinetics of T23 and T24 can be described by the double logarithmic equation and parabolic equation respectively.To describe the corrosion of materials accurately it is not sufficient to analyze the macro-mass gain and the macro-thickness of the corroded layer only,but the EDS should be applied to examine the migration depth of corrosive elements O and S.It is revealed that the corrosion becomes more severe when H₂S is present in the corrosive gas.S is more active than O,and Cr can reduce the migration of oxygen but not S.The combination corrosion of S and O and pure [S] has a stronger corrodibility than pure H₂S.T24 suffers the most severe corrosion at oxygen content of 0.8%.Corrosion is aggravated when the corrosion temperature is above 450℃ in the alternating atmosphere.T23 has better corrosion resistance than T24 and W contributes a lot to the corrosion resistance of T23.

Key words: stainless steel, mass gain, element migration, high temperature corrosion

摘要： Candidate materials for water wall of supercritical and ultra-supercritical utility boilers,T23 and T24,were chosen as the experimental samples and exposed to oxidizing atmosphere,reducing atmosphere and oxidizing/reducing alternating atmosphere separately.The corrosion temperature was 450-550℃.The effects of oxygen content and temperature on the corrosion in reducing atmosphere and alternating atmosphere were investigated.The scanning electron microscope(SEM) and energy dispersive spectrometer(EDS) were used to examine the corroded samples.The results show that the corrosion kinetics of T23 and T24 can be described by the double logarithmic equation and parabolic equation respectively.To describe the corrosion of materials accurately it is not sufficient to analyze the macro-mass gain and the macro-thickness of the corroded layer only,but the EDS should be applied to examine the migration depth of corrosive elements O and S.It is revealed that the corrosion becomes more severe when H₂S is present in the corrosive gas.S is more active than O,and Cr can reduce the migration of oxygen but not S.The combination corrosion of S and O and pure [S] has a stronger corrodibility than pure H₂S.T24 suffers the most severe corrosion at oxygen content of 0.8%.Corrosion is aggravated when the corrosion temperature is above 450℃ in the alternating atmosphere.T23 has better corrosion resistance than T24 and W contributes a lot to the corrosion resistance of T23.

关键词: stainless steel, mass gain, element migration, high temperature corrosion

ZHAO Qinxin, ZHANG Zhixiang, CHENG Dingnan, WANG Yungang, DENG Xiang. High Temperature Corrosion of Water Wall Materials T23 and T24 in Simulated Furnace Atmospheres[J]. Chin.J.Chem.Eng., 2012, 20(4): 814-822.

赵钦新, 张知翔, 成丁南, 王云刚, 邓翔. High Temperature Corrosion of Water Wall Materials T23 and T24 in Simulated Furnace Atmospheres[J]. Chinese Journal of Chemical Engineering, 2012, 20(4): 814-822.

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High Temperature Corrosion of Water Wall Materials T23 and T24 in Simulated Furnace Atmospheres

High Temperature Corrosion of Water Wall Materials T23 and T24 in Simulated Furnace Atmospheres

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