pH value of 9–10, temperature of 80°C; the gray cast iron impeller of the pump was damaged after half a year
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This post was last edited by mli1979 on 2018-3-19 at 11:59. The pH value of the material is 9-10, the temperature is 80°C, and the material also contains a small amount of sediment. The gray cast iron impeller of the material transfer pump was damaged after being in use for half a year; could those with expertise please check whether this was caused by alkali embrittlement or erosion? Thank you!
The front cover is missing; judging from the condition of the impeller and the inner walls of the volute, cavitation must have occurred at the pump inlet
It is likely due to sediment in the materials; you can discuss this with the manufacturer and consider using a wear-resistant material for the impeller
The hardness of the cast iron surface is higher than that of low-carbon cast steel, and the cause of the fracture of the impeller front cover is \"alkali embrittlement\"!
First of all, thank you for your reply; I have resent the front cover. Could you take another look, please?
Thank you all for your participation and responses.
This is related to the concentration of the alkaline solution; when the concentration of the alkali exceeds 30% and the temperature reaches 80°C, the corrosive effect of the alkaline solution on carbon steel increases sharply