海鹹水中に於ける金属の腐蝕について (第1表):異種金属の組合せによる腐蝕について
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We began to investigate this problem: the corrosion of salt manufacturing apparatus and its counter-plan.<BR>In preceeding pa ers we measured the electrode potentials of metal such as mild steel, cast iron, clipper, zinc and 13% cromium steel in sea water and brine at 20°C, 50°C and 80°C and determined the current-potential curve when the current flow between anode and cathode. Furthermore searched for weight of metal corroded at the same temperature and found that the weight of these metal corroded were seriously affected by the amount of dissolved oxygen in the solution.<BR>In this paper we investigated the electrochemical corrosion moreover. First we determined the relationship between calculated value by corrosion current and observed loss of weight of electrode in the case of combination which bimetallic systems were immersed in these solution. Second measured the electrode potential of mild steal, cupper and zinc in metallic sulfate solution in various concentration respectively.<BR>The results were followed. If the current flowing from anode is devoted to the corrosion of metal the weight of metal corroded expressed in grams, W, is obtained by Faradays' Law.<BR>W=i·t·k (1)<BR>Where t is the time expressed in hours, i the current in amperes, and k the electrochemical equivalent. In the matter of fact there were region which above equation (1) could be applied or not depend on the area ratio of anodic and cathodic electrods.<BR>When anodic area (basic) was larger than cathode (noble) this equation could be fairly applied, but on the other way anodic area was smaller than cathode could not be applied and the weight of metal corroded was affected by oxygen dissolved in the solution for the most part.
- 日本海水学会の論文
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