抗坏血酸在亚硫酸盐防腐蚀中的作用

Role of ascorbic acid in sulfite corrosion control

通过除氧试验、腐蚀试验和电化学试验，研究了抗坏血酸在亚硫酸盐防腐蚀中的作用。结果表明，抗坏血酸使亚硫酸盐几乎失去了除氧作用，却提高了亚硫酸盐在含氧水中对标准钢试件的防腐蚀性能，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。

Studies the behaviour of ascorbic acid by carrying out deaeration tests, corrosion experiments and electrochemical tests. The results show that the ascorbic acid tend to deprive sulfites of their oxygen removal capacity, but enhance their anticorrosive effect, by leading the corrosion potential to shift in a less noble direction, and cathode polarization of steel specimen in water containing oxygen, which defy explanation with the currently accepted oxygen removal mechanism, but provide an important evidence for the impressed reductive atmosphere mechanism of sulfite and an effective method for preventing sulfite failure in storage.