烟道气氨法脱硫液对Q235碳钢腐蚀研究

采用静态挂片、极化曲线和长期点蚀实验,研究了氨法脱硫浆液中F^-和Cl^-以及(NH4)2SO4对Q235碳钢腐蚀的影响。结果表明,Q235碳钢在含卤硫铵溶液中的均匀腐蚀速率随F^-浓度和Cl^-浓度增大均呈现先降低后增高的趋势,随着(NH4)2SO4质量分数增加,均匀腐蚀速率降低;随着F^-浓度的增大,自腐蚀倾向增加;随着Cl^-浓度以及(NH4)2SO4质量分数的增大,自腐蚀倾向均降低;Q235碳钢在氨法脱硫模拟浆液中点蚀较严重,需采取重防腐措施。

Corrosion of Q235 Carbon Steel in Ammonia-based Flue Gas Desulfurization Slurry

The effect of F^-, Cl^- and (NH₄)₂SO₄ on the corrosion of Q235 carbon steel in ammonia-based flue gas desulfurization slurry was studied by means of static immersion test, polarization curve measurement and long-term pitting corrosion test. The results showed that the uniform corrosion rate of Q235 steel in the halogen-containing ammonium sulphate slurry decreased first and then increased with the increase of F^- and Cl^- concentration. As the content of (NH₄)₂SO₄ increased, the uniform corrosion rate decreased. The corrosion tendency of the steel increased with the increase of F^- concentration, and decreased with the increase of Cl^- concentration and the content of (NH₄)₂SO₄. The pitting corrosion of Q235 carbon steel in ammonia desulfurization simulation slurry is serious, and therefore, heavy anti-corrosion measures are needed.