Study on Corrosion of Reclaimed Water to Steel Pipe and Ductile Cast Iron Pipe
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Abstract:
The laboratory rotary coupon test was used to investigate the corrosion behavior of reclaimed water treated by the conventional process and membrane process on A3 carbon steel and ductile cast iron, and the impacts of five types of water quality parameters on the two materials were analyzed. Experiment results showed that (1) the corrosion on the two materials of reclaimed water treated by membrane process is higher than that treated by conventional process; (2) A3 steel has higher corrosion resistance than ductile cast iron in the reclaimed water; (3) SO42- can facilitate corrosion in the two materials, and corrosion morphology can change when the concentration is 60 ~ 120 mg/L; (4) Cl - has the same corrosion effects on A3 carbon steel and ductile cast iron as SO42- .When the concentration of Cl - reach to 90 ~ 120 mg/L, the corrosion trend varies from surface corrosion to point corrosion; and (5) the corrosion rate of A3 carbon steel and ductile cast iron in the two types of reclaimed water decreases with the increasing of alkalinity. When the hardness of 30 ~ 120 mg/L, reclaimed water has inhibitory effects on corrosion to the ductile cast iron. The type of water quality needs to be considered when the LSI and LR indexes are applied to evaluate the corrosion effects of water quality on A3 steel and ductile cast iron.
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