高温度に於ける金屬の酸化速度に就いて
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Known papers relating to the investigation of oxidation phenomenon for metals at high temperatures throughly studied are very large in their number. But they are only results that concerned the change of weight with time by the oxidation and these results are not sufficient to deduce the course of oxidation of metals. Moreover, in the limit of my inquiring, papers precisely discussed on the theoretical side of this subject have rarely been contributed. The known equation that expresses the oxidation velocity of metals obtained theoretically and now geuerally used is as follew : dm/dt=R/m where R is a some constant, in the weight of oxide-film, t the time, and this equation is taken as can hold in the whole range of oxidation. However, in my consideration, it may only hold in a very narrow range of the early period of oxidation and not in a whole range of oxidation as usually taken. Then I have theoretically considered this problem and arrived at a some conclusions, that is the oxidation of metals may be divided into the three stages, and the above expression may be considered as only applicable to the second stage in the course of oxidation of metals. The first step is the oxidation of metals in no presence of oxidefilm on their surface. The third stage is its oxidation after some measurable oxide-film produced on the metal-surfaces. The author have theoretically derived the expression of the oxidation velocity of metal for this third stage. Practically the oxidation of this stage may be considered as important factor, if we are required to compare the non-oxidisability among many metals. The experimental test for correctness of the expression derived by the anthor is now requisited. The author now confines himself on the investigalion of this point so that defers to future for its contribution.
- 社団法人日本鉄鋼協会の論文
- 1932-08-25
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