黒鉛電極に関する研究(第6報) : 電解板の短期試験法
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We have investigated on a rapid method of estimating the life of anode graphite at the amalgam process chlorine-caustic sell, by electrolysis of sodium soleplate solution and by electrolysis of sodium chloride solution containing soleplate. This method is based on our researches about the mechanism of corrosion of anode graphite described in the previous papers. That is to say, the corrosion in electrolysis of sodium soleplate solution under conditions of above 40℃, acidity of below 1 N, and anode current density of above 5 amp/dm^2, And that at the amalgam process chlorine-caustic cell were of just the same mechanism, namely, the pure chemical oxidation consumption from surface of graphite crystal. The following methods were found preferable : (1) The sodium sulphate solution electrolysis method for the domestic anode graphite : The corrosion rates in mg/Ah unit of anode graphites treated for 3 hours under electrolytic conditions of sulphate concentration of Na_2SO_4・10H_2O 100 g/l, 60℃, anode current density of 10 amp/dm^2 are compared with each other. This method was found to be better than the other method for the domestic anode graphite. (2) The rapid method, combining electrolysis of sodium sulphate solution with electrolysis of sodium chloride solution containing sulphate, for domestic and A cheson's anode graphites : The anode graphites were treated preliminarily by the above-mentioned sulphate solution electrolysis, and then treated intermediately for 2 hours under conditions of 60℃, acidity of pH 2 o 3, and anodic current density of 50 amp/dm^2 with sodium chloride solution of concentration of NaCl 260 g/l contained sulphate of Na_2SO_4 25 g is one liter of brine. In the last formal elecrolysis, the samples are treated for 4 hours under the same condition as intermediate treatment, and the corrosion rates which were measured as difference of weight in this formal elecrolysis are compared with each other. This method resulted in the best coincidence with the order obtained in long time test by amalgam process chlorine-caustic sell as for the domestic and Acheson's anode graphites.
- 社団法人日本材料学会の論文
- 1963-04-15
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