硫酸盐法制浆过程中阴离子对304不锈钢孔蚀的影响

摘要

The effect of anion on the pitting corrosion of 304 stainless steel in kraft pulping was investigated with potentiodynamic polarization curve. The results showed that chloridion and sulfide in medium are corrosive, which can destroy the passive film of stainless steel and promote the formation and growth of the pits; sulfuric acid radical ion and carbonate acid radical ion can prevent the corrosion and the formation of pits of stainless steel, especially when the concentration of carbonate acid radical ion reaches 0.094 mol/L and sulfuric acid radical ion reaches 0.014 mol/L; the pitting phenomenon of 304 stainless steel is easier to occur in the simulative cooking liquid, when temperature increases.%用动电位扫描极化曲线研究了硫酸盐制浆中的阴离子对304不锈钢孔蚀的影响。结果表明，介质中的氯离子和硫离子具有侵蚀性，可以破坏不锈钢上的钝化膜，促进蚀孔的形成和生长；硫酸根离子和碳酸根离子可抑制不锈钢的腐蚀和蚀孔的形成，当碳酸根离子浓度达到0.094 mol/L、硫酸根离子浓度超过0.014 mol/L时，孔蚀可被明显抑制；随着温度的升高，在模拟蒸煮液中，304不锈钢的孔蚀更易发生。