Corrosion Effects of Cl- and SO42- on Water Wall Tube Material

ZHANG Hongjiang; LI Yongli; HU Yuanxiang; WANG Rui

doi:10.11973/fsyfh-202305002

Corrosion & Protection > 2023 > 44(5): 7-12,18. > DOI: 10.11973/fsyfh-202305002

ZHANG Hongjiang, LI Yongli, HU Yuanxiang, WANG Rui. Corrosion Effects of Cl^- and SO₄^2- on Water Wall Tube Material[J]. Corrosion & Protection, 2023, 44(5): 7-12,18. DOI: 10.11973/fsyfh-202305002

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Corrosion Effects of Cl^- and SO₄^2- on Water Wall Tube Material

North China Electric Power Research Institute Co., Ltd., Beijing 100045, China

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Received Date: July 02, 2021

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In view of the corrosion problems that may be caused by Cl^- and SO₄^2- in feed water or boiler water of high parameter units, the effects of Cl^- and SO₄^2- on the corrosion of 15CrMoG steel were investigated by 24 h coupon corrosion tests for 15CrMoG steel in water containing different content of Cl^- and SO₄^2- under simulated oxygenation condition (300℃, 8.5 MPa), and by analysis with atomic absorption spectrophotometer, metallographic microscope, scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD). The results showed that both Cl^- and SO₄^2- damaged the Fe₃O₄ passivation film on 15CrMoG steel surface, causing pitting corrosion and promotion of Fe dissolution. Cl^- and SO₄^2- showed obvious synergistic effect when two ions existed at the same time, which resulted the increase of pits in quantity and depth and the increase of Fe ions in solution.
- water wall tube,
- chloride ion,
- sulfate ion,
- corrosion effect

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