塩素イオンを含む流動水中におけるポンプ用材料の腐食

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  • Corrosion of Several Materials for Pump in Flowing Water Containing Chloride Ion
  • エンソ イオン オ フクム リュウドウ スイチュウ ニ オケル ポンプヨウ ザ

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Corrosion behavior of four materials (gray cast iron: FC20, low-chromium gray cast iron: ES51F, austenitic gray cast iron: A. S. T. M. A 436 type 2, mild steel: SS 41), which are frequently used for pumps, was investigated in flowing water (7 kinds of flow speed range from 0 to 15m/s) containing chloride ion (6 levels of concentration range from 25 to 30, 000ppm) at 30°C. Equicorrosion-rate charts were constructed in a similar way of drawing a map and were successful in indicating effects of flow speed and chloride ion concentration simultaneously. FC 20 and ES 51 F showed similar behavior and both had a peak of corrosion rate at the condition of approximately 580ppm Cl- and 0.5m/s. By comparison of FC 20 with ES 51 F on the whole, ES 51 F was superior to FC 20. The behavior of SS 41 was dissimilar to FC 20 and ES 51 F. SS 41 revealed a peak of corrosion rate at the condition of approximately 5, 600ppm Cl- and 5m/s, and its peak (over 1.4mm/year) was higher than that of FC 20. Corrosion rate of A 436 type 2 was 0.5mm/year even at the maximum and revealed no peaks in this test condition, and it was confirmed that this material has good durability for pumps.

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