异抗坏血酸稳定亚硫酸盐防腐蚀作用的研究

Anti corrosion Action of Sulfite Stabilized by Isoascorbic Acid

通过除氧试验、腐蚀试验和电化学试验，研究了异抗坏血酸对亚硫酸盐防腐蚀效果的影响。结果表明，异抗坏血酸使亚硫酸盐几乎失去了除氧作用，但却提高了亚硫酸盐在含氧水中对２０ｇ钢的防腐蚀性能，使钢的自腐蚀电位更剧烈负移并使阴极极化增加。试验结果用公认的除氧机理无法解释，但为外加还原性气氛机理提供了有力证据，同时为增强亚硫酸盐的防腐蚀效果和解决其贮存失效问题提供了可行的方法。

The dependence of anti corrosion of sulfite on isoascorbic acid was studied through the use of oxygen removal tests, corrosion experiments and electrochemical tests. It has been shown that the isoascorbic acid can make sulfite to nearly lose oxygen removal capacity, but it increases the other functions of the sulfite, including anti corrosion effect on 20G steel, potential shift in a less noble direction and the cathodic polarization of steel in water containing oxygen. It is impossible to explain the test results with the currently accepted oxygen removal mechanism. However, the results provided important evidences for the impressed reductive atmosphere mechanism of sulfite. A feasible method for strengthening the anti corrosion effectiveness of the sulfite and an effective method for preventing sulfite failure during its storage have been made available.