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<p>This paper introduces a novel acid-resistant steel alloyed with Cu and Sb as a substitute for stainless steel in Flue Gas Desulfurization (FGD) applications. Immersion tests at 70&#xa0;°C assessed the corrosion resistance of the new alloy compared with 316&#xa0;L stainless steel in two simulated flue gas condensate solutions: one containing CuCl<sub>2</sub> and the other without. The results indicated that the acid-resistant steel demonstrated exceptional corrosion resistance in the CuCl<sub>2</sub>-containing solution, exhibiting a corrosion rate of 3.05&#xa0;mm/a after 480&#xa0;h. Corrosion occurred in both the solutions; however, there were notable differences between them. In the absence of CuCl<sub>2</sub>, the corrosion products included Fe<sub>2</sub>O<sub>3</sub>, Fe<sub>3</sub>O<sub>4</sub>, α-FeOOH, γ-FeOOH, and oxides of Cu and Sb, with the corrosion mechanism involving Sb’s consumption of H<sup>+</sup> ions, which reduced local acidity and allowed for the formation of insoluble Sb compounds that inhibited corrosion. Conversely, in the presence of CuCl<sub>2</sub>, the corrosion products featured elemental Cu, and the mechanism involved a dynamic equilibrium between Cu dissolution and regeneration, effectively sealing the gaps in the corrosion product layer and enhancing the overall corrosion resistance of the acid-resistant steel.</p>

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The Corrosion Behavior of Acid-Resistant Steel in Condensed Solution Environment of Chlorine-Containing Flue Gas Desulfurization

  • 期刊论文

  • 发表日期：

    2025年2月26日

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  • Chenghui Yin,
  • Jinshuo Li,
  • Qiang Yu,
  • Shuliu Wang,
  • Chaofang Dong,
  • Junsheng Wu,
  • Kui Xiao

摘要

This paper introduces a novel acid-resistant steel alloyed with Cu and Sb as a substitute for stainless steel in Flue Gas Desulfurization (FGD) applications. Immersion tests at 70 °C assessed the corrosion resistance of the new alloy compared with 316 L stainless steel in two simulated flue gas condensate solutions: one containing CuCl2 and the other without. The results indicated that the acid-resistant steel demonstrated exceptional corrosion resistance in the CuCl2-containing solution, exhibiting a corrosion rate of 3.05 mm/a after 480 h. Corrosion occurred in both the solutions; however, there were notable differences between them. In the absence of CuCl2, the corrosion products included Fe2O3, Fe3O4, α-FeOOH, γ-FeOOH, and oxides of Cu and Sb, with the corrosion mechanism involving Sb’s consumption of H+ ions, which reduced local acidity and allowed for the formation of insoluble Sb compounds that inhibited corrosion. Conversely, in the presence of CuCl2, the corrosion products featured elemental Cu, and the mechanism involved a dynamic equilibrium between Cu dissolution and regeneration, effectively sealing the gaps in the corrosion product layer and enhancing the overall corrosion resistance of the acid-resistant steel.