硼酸系复合浸渍增强炭电极抗氧化性能研究

研究了硼酸-硫酸铝-白炭黑复合体系浸渍剂对炭电极材料抗氧化性能的影响。首先用单种不同浓度的浸渍剂(硼酸、硫酸铝和白炭黑)处理碳电极样品,在800℃静态空气下进行氧化失重实验,考察上述浸渍剂的含量对炭电极氧化失重率的影响。结果显示,随着硼酸浓度的增加,炭电极的失重率基本上呈下降趋势,浓度大于4%后减少变弱;随着硫酸铝浓度的增加,炭电极的失重率先减小后增大,浓度为6%最好;随着白炭黑浓度的增加,炭电极的失重率亦先减小后增大,以浓度为1%最佳;然后基于上述结果,进行配方正交实验设计,采用三因素四水平正交设计方案,通过极差计算对正交实验结果进行分析,确定最佳配方为硼酸、硫酸铝、白炭黑配比为5∶4∶1。最后,实验研究了浸渍次数对炭电极材料的抗氧化性能的影响。此外对炭电极抗氧化机理进行初步分析。

Study on the Enhancement of Anti-oxidation Ability of Carbon Electrode Materials by Borate-White Carbon Black Composite Impregnation

The effect of boric acid-aluminum sulfate-white carbon black composite impregnant on the anti-oxidation ability of carbon electrode materials was studied. The carbon electrode was treated by single impregnant （boric acid, aluminum sulfate and white carbon black ） with various con- centrations in order to investigate the effect of content of above-mentioned impregnants on the oxidation weight loss rate, the oxidation weight loss ex- periment was carried out under static air at 800℃. The results showed that with the increase of boric acid concentration, the weight loss rate of carbon electrode decreased. The boric acid concentration of 4% would be optimal. With the increase of aluminum sulfate concentration, the weight loss rate of carbon electrode decreased firstly and then increased. The aluminum sulfate concentration of 6% would be the best. With the increase of white carbon black concentration, the weight loss rate of carbon electrode also decreased firstly and then increased. The optimal concentration of white carbon black would be 1%. Based on the above mentioned results, the orthogonal experiments were carried out with 3 factors and 4 levels to confirm the formula. The best formula was confirmed by analyzing the rage of orthogonal experiment results and showed as follows： the ratio of boric acid to aluminum sul- fate to white carbon black should be 5：4：1. Finally, the effect of impregnation times on the weight loss rate of carbon electrode materials was studied in detail. Furthermore, the anti-oxidation mechanism of carbon electrode was preliminary discussed.