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Corrosion Characteristics of Carbon Steel in High Temperature Gas Containing Ammonium Bisulfate and Ammonium Sulfate |
Shuangchen MA1, Kunling JIAO1, Linan ZHANG1, Yao SUN1, Wenlong WU2, 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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Abstract The corrosion of carbon steel in high temperature gas containing ammonium bisulfate (ABS) and ammonium sulfate (AS) was studied by means of weight loss method, SEM/EDS and XRD. Results show that in the range of 108~282 ℃, the ABS and AS in flue gas are both corrosive to carbon steel, while ABS causes more serious corrosion. As the concentration of ABS and AS in gas phase increases, the corrosion rate is accelerated; with the rising gas temperature, the corrosion rate is slowed down. The corrosion mechanism is speculated as follows: due to the acidity of ABS and AS solution, H+ acid corrosion is the main corrosion of carbon steel, but oxygen corrosion also takes place. The anode reaction generated Fe2+ may then induces the secondary reaction to form series of iron oxides, thereafter ammonium sulfate salt interacts with Fe2O3 and Fe3O4 to generate ammonium sulfate (NH4)Fe(SO4)2 and other double salts.
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Received: 27 June 2016
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