酸性河水を使用する水力発電所における腐蝕並に防蝕の研究（第5報）電気化学的研究（その2）鉄の腐蝕機構

抄録

The mechanism of corrosion of Iron in acid river water was investigated, and the following results were obtained :
(i) The rate determining step of corrosion reaction was the diffusion of hydrogen ion. (ii) In the range of pH less than 4.0, the corrosion of iron in stagnant solutions was diffusion control of hydrogen ion at first, but it changed to diffusion control of oxygen as time elapsed, owing to the difference in diffusion velocity. (iii) By the calculation by the diffusion theory, the corrosion velocity of iron in acid viver is to be a maximum at pH 4.4. The observed value was pH 4.3. (iv) The activation energy of corrosion reaction on iron in acid river water (pH 3.0) was about 1.4 kcal/mol.