鑄鐵・アルムコ鐵及び鋼が水中に於ける初期の點蝕現象と受働態の關係に就て
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The experimental works were undertaken by the au her, dealt with phenomena of pitting and passivity upon specimens, Cast Iron, Armco Iron, Eutectoid Carbon Steel and Copper Bearing Steel, which were immersed both into artificial and natural water. Using special measuring methods of potential under reference of O_2 content in the water and heterogenousness of materials considering Ph value, electrolyte and current density. Another method was used for researching of O_2 and CO_2 as a factor on pitting and passivity under moving aerated water. Results were discussed and recognized as follows, viz. : - 1) Passivity of Iron and Steel in water is the formation of oxide film by direct oxidation. 2) Pitting is a result of the nonuniformity of passivity on the whole surface of the specimen. 3) Main causes for the lack of uniformity of passivity are two, viz. : One is the depolarisation of the passive part by the hydrogen generation, and the other is the partial passive state formation by the differential aeration. 4) Current sets up between the surface, which is protected by an oxide film as a cathod, and the other parts as an anode. With reference to current flow, special calcium magnesium silicate scales were deposited only on the cathodic area in the natural water. 5) The order of the initial pitting tendency of the specimens are copper bearing steel, armco iron, eutectoid carbon steel and cast iron, and these results are on account of the direct oxidation of the material by oxygen.
- 社団法人日本鉄鋼協会の論文
- 1934-07-25
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- 鑄鐵・アルムコ鐵及び鋼が水中に於ける初期の點蝕現象と受働態の關係に就て
- 20) 鑄鐵、アルムコ鐵、及鋼が水中に於ける初期 Pitting 現象と Passivity との關係に就いて(日本鐵鋼協會第拾貳囘講演大會)