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中国腐蚀与防护学报  2016, Vol. 36 Issue (4): 335-342    DOI: 10.11902/1005.4537.2015.155
  研究报告 本期目录 | 过刊浏览 |
SCR脱硝副产物硫酸氢铵对锅炉尾部金属材料的腐蚀特性研究
马双忱1(),邓悦1,吴文龙2,檀玉1,张立男1,柴峰1,孙盼盼1,张小霓2
1. 华北电力大学环境科学与工程学院 保定 071003
2. 国网河南省电力试验研究院 郑州 450052
Corrosion Characteristics of Downstream Metal Material of Boiler System in Solution of By-product Ammonium Bisulfate from SCR Denitrification
Shuangchen MA1(),Yue DENG1,Wenlong WU2,Yu TAN1,Linan ZHANG1,Feng CHAI1,Panpan SUN1,Xiaoni ZHANG2
1. College of Environmental Science and Engineering, North China Electric Power University (Baoding), Baoding 071003, China
2. Electric Power Test Research Institute of Henan Province, Zhengzhou 450052, China
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摘要: 

通过失重法研究了锅炉尾部材料碳钢和不锈钢在ABS (硫酸氢铵) 和H2SO4两种溶液中的腐蚀行为,利用动电位极化曲线分析腐蚀特性。采用SEM/EDS和XPS表征手段分析了腐蚀产物表层的形貌和元素组成以及化合态。结果表明：不锈钢对ABS有更好的耐蚀性,且随着ABS溶液浓度的增大,腐蚀变剧烈。腐蚀产物的种类有Fe2O3,FeOOH,Fe3O4和铁的硫酸盐。碳钢和不锈钢在等浓度的ABS和硫酸溶液中腐蚀过程相似,说明ABS具有很强的腐蚀性。腐蚀机理为碳钢表面首先发生酸性腐蚀,H+作为去极化剂,有H2析出。随着酸度的消耗,金属表面会发生氧腐蚀,溶解氧作为去极化剂。Fe2+接着被进一步氧化为Fe3+,再发生一系列的次生反应,生成Fe的氧化物以及硫酸盐等。
关键词 ： SCR,  硫酸氢铵,  H2SO4,  失重法,  腐蚀特性    
Abstract：

The corrosion behavior of the boiler tail material which is made of carbon steel and stainless steel in solutions of ammonium bisulfate (ABS) and H2SO4 respectively was studied by means of mass loss measurement and potentiodynamic polarization curve as well as SEM/EDS and XPS. The results showed that: stainless steel has better corrosion resistance to ABS, and with the increase of ABS solution concentration, corrosion becomes more intensive. The corrosion products consist of Fe2O3, FeOOH, Fe3O4, iron sulfate and a small amount of iron carbon oxide. The corrosion process of carbon steel and stainless steel is similar in the solutions with the same concentration of ABS and sulfuric acid. It can be concluded that ABS has stronger corrosivity. The corrosion mechanism is that hydrogen depolarization first may occur during the corrosion of carbon steel, and then generate hydrogen. As the acid consumption, as well as the effect of dissolved oxygen in the solution, the oxygen depolarization corrosion will happen on metal surface, Fe2+ is then further oxidized to Fe3+, produces a series of secondary reaction, to generate iron oxide and sulfate, etc.
Key words： SCR    ABS    H2SO4    weight loss method    corrosion performance
    
基金资助:国网河南省电力公司电力科学研究院项目 (SJTYHT/13-GS-178) 资助
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马双忱
邓悦
吴文龙
檀玉
张立男
柴峰
孙盼盼
张小霓

引用本文:

马双忱,邓悦,吴文龙,檀玉,张立男,柴峰,孙盼盼,张小霓. SCR脱硝副产物硫酸氢铵对锅炉尾部金属材料的腐蚀特性研究[J]. 中国腐蚀与防护学报, 2016, 36(4): 335-342.
Shuangchen MA, Yue DENG, Wenlong WU, Yu TAN, Linan ZHANG, Feng CHAI, Panpan SUN, Xiaoni ZHANG. Corrosion Characteristics of Downstream Metal Material of Boiler System in Solution of By-product Ammonium Bisulfate from SCR Denitrification. Journal of Chinese Society for Corrosion and protection, 2016, 36(4): 335-342.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.155      或      https://www.jcscp.org/CN/Y2016/V36/I4/335

Steel C Si Mn S P Cr Ni Cu Fe
20# 0.21 0.25 0.35 0.03 0.035 0.21 0.25 0.20 Bal.
304ss 0.08 0.95 1.91 0.01 0.034 18.41 8.14 0 Bal.
表1  20#碳钢和304不锈钢试样的化学成分
图1  在3000 mg/L ABS和3000 mg/L H2SO4溶液中碳钢表面腐蚀的SEM像
图2  3000 mg/L ABS溶液中304不锈钢试样的腐蚀形貌
图3  20#碳钢在不同浓度ABS和硫酸溶液中的腐蚀速率
Solution Concentration
mgL-1		 Time
h		 Superficial areacm2 Original mass / g Present mass / g Mass lossg Corrosion rate
g / (m2h)
Blank --- 1440 24.3442 30.753 30.505 0.249 0.071
ABS 300 1440 24.7330 26.294 26.030 0.264 0.074
3000 1440 24.7330 26.189 25.802 0.388 0.109
30000 1440 26.354 28.443 26.889 1.55546 0.410
H2SO4 300 1440 29.428 29.189 28.853 0.337 0.079
3000 1440 23.891 26.015 25.279 0.735 0.214
30000 1440 27.113 29.188 27.195 1.993 0.511
表2  碳钢试样称重结果记录
Solution Concentration
mgL-1		 Time
h		 Superficial area / cm2 Originalmass / g Present mass / g Mass loss / g Corrosion rate
×10-3 g / (m2h)
Blank --- 1440 21.337 15.8167 15.8133 0.0034 1.1066
ABS 300 1440 24.303 18.1529 18.1490 0.0039 1.1144
3000 1440 21.215 15.7885 15.7802 0.0083 2.7169
30000 1440 21.756 16.2335 16.2232 0.0103 3.3715
H2SO4 300 1440 21.630 16.127 16.121 0.005 1.702
3000 1440 21.627 16.005 15.996 0.008 2.601
30000 1440 21.030 15.335 15.324 0.011 3.632
表3  不锈钢试样称重结果记录
图4  不同浓度ABS和硫酸溶液中不锈钢的腐蚀速率
图5  20#碳钢在3000和30000 mg/L ABS溶液中浸泡60 d的EDS结果和表面成分
图6  20#碳钢在不同浓度ABS溶液中的动电位极化曲线
图7  碳钢在3000 mg/L ABS和H2SO4溶液中的动电位极化曲线
图8  304不锈钢在不同浓度ABS溶液中的动电位极化曲线
图9  304不锈钢在3000 mg/L ABS和H2SO4溶液中的腐蚀极化曲线
图10  20#碳钢在300和3000 mg/L ABS溶液中腐蚀后表面的XPS全谱
图11  不同浓度ABS溶液中碳钢腐蚀膜层的各元素峰
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