流動食塩水中における軟鋼の腐食と砂混入の影響

抄録

The corrosion and erosion of mild steel were studied in water containing 3% sodium chloride with the relative velocities of 10-18m/sec at 30°C, by using high-speed rotor test apparatus.
The results obtained were summarized as follows:
(1) The corrosion rates of mild steel increased markedly in moving condition as compared with stagnant one, whereas it did not increase in spite of the increase of velocity from 10 to 18m/sec in the pH range 7-10. (2) There is a maximum of corrosion rates at pH 8-9 in moving condition. (3) The corrosion rates increased markedly by sand particles contained in the solution, and the erosion that could not be eliminated by cathodic current also occurred. (4) The sand erosion with a relativee velocity of 10-18m/sec is considered to be mainly of mechanical nature.