Characterization of Scour Corrosion of Urban Drainage Pipes
The scour corrosion of hydraulic pipelines as well as the analysis of anti-corrosion was studied.Experiments were carried out on steel water pipelines to test the effects of corrosion and abrasion on pipeline performance.A sand-water suspension with a concentration of 5 000～20 000 mg·L-1 was used in the experiments.Physical properties such as the size and morphology of the sand particles and the settling concentration of the sand-water suspension were examined through the tests.The results showed that the main corrosion occurred in the lower part of the pipe.The corrosion inhibition of water supply pipes in different corrosive media was investigated by the adsorption of ammonium pyrrolidine dithiocarbamate(APDTC)on the pipe surface.The effects of corrosion solution concentration,APDTC mass fraction and immersion time on the corrosion inhibition efficiency of APDTC were investigated using weightlessness experiments and UV-Vis spectrophotometer analysis.The results of weightlessness experiments showed that the corrosion inhibitor efficiency increased with the increase of corrosion inhibitor concentration and immersion time.The corrosion inhibitor efficiency decreased with the increase of corrosion solution concentration.
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