Corrosion Of Carbon Steel In Waters Of Varying Purity And Velocity (original) (raw)

NACE - International Corrosion Conference Series

There have been several instances where water purified from seawater by reverse osmosis has caused accelerated corrosion of carbon steel pipes. Therefore research was undertaken to determine the corrosion rate of low carbon steel in water with different contaminants, with and without aeration, and at different velocities. The results show that in high purity deionized (DI) water with oxygen, the corrosion rates were initially very high but dropped rapidly within a few hours to <100µm/yr. In jet impingement of DI water with oxygen, the corrosion rates dropped even lower, approaching zero, because the steel surface passivated. Water analysis from the reverse osmosis units from the offshore oil drilling platforms showed that reverse osmosis units would typically leave behind many ppm of NaCl and Na 2 SO 4 . Therefore laboratory tests were conducted and it was found that adding NaCl and Na 2 SO 4 to the DI water, increased the corrosion rate, proportionally to the concentration. In t...

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