栲胶法脱硫液对Q245R材料腐蚀性研究  

Effect of tannin extract desulfurization solution on corrosion of Q245R material

作　　者：薛敏华[1] 浮建军[1] 钱福军 张震[1] 王保森[1] 莫友彬 曹家兴[1] 裴锐南[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004 [2]广西化工研究院,广西南宁530001

出　　处：《天然气化工—C1化学与化工》2018年第1期92-98,共7页Natural Gas Chemical Industry

基　　金：国家自然科学基金(21266003);广西教育厅自然科学基金(20110733)

摘　　要：利用电化学Tafel技术,研究了Na_2CO_3-NaHCO_3碱介质中,栲胶法脱硫剂组分和硫副盐对Q245R材料腐蚀性的影响。结果表明:脱硫剂组分NaVO_3有显著缓蚀作用,其质量浓度为0.5g/L时缓蚀率达77.2%,随NaVO_3质量浓度增至3.0g/L缓蚀率略有增加。栲胶质量浓度0~1.0g/L时,随其质量浓度增大而材料的腐蚀速率有所增加;栲胶质量浓度1.0~5.0g/L时,随其质量浓度增大而材料的腐蚀速率减小;栲胶可促进NaVO_3对材料缓蚀作用;模拟物单宁酸有缓蚀作用。栲胶法脱硫液中硫副盐可加剧材料的腐蚀,Na_2SO_4、Na_2S_2O_3、NaSCN质量浓度分别达40、80和150g/L时,材料的腐蚀速率显著增加。The effects of tannin extract desulfurizer components and sulfur by-salts on the corrosivity of Q245R were investigated in the Na2CO3-NaHCO3 alkali medium by electrochemical Tafel technology. The results show that the desulfurizer component NaVO3 has significant corrosion inhibition with a inhibition rate of 77.2% at the concentration of 0.5g/L, and the inhibition rate increases a little with the NaVO3 concentration increased to 3.0g/L . The corrosion rate of the material increases a little with the tannin extract concentration in the range of 0 to 1.0g/L, but decreases in the range of 1.0 to 5.0g/L. Corrosion inhibition of NaVO3 on the material is improved by Tannin extract. The simulated tannic acid also has an inhibitory effect. The corrosion of material can be exacerbated by sulfur by-salt in desulfurization solution, and the corrosion rate is significantly increased when the concentrations of Na2SO4, Na2S203 and NaSCN are more than 40, 80 and 150g/L, respectively.

关 键 词：栲胶法脱硫 脱硫液 腐蚀 硫副盐 Tafel 

分 类 号：TQ546.5[化学工程—煤化学工程] TQ028.25