Corresponding Author

Yong LI


The corrosion behavior of power grounding galvanized flat steel was studied by polarization measurement, electrochemical impedance spectroscopy and neutral salt spray test in 5% NaCl solutions. The surface morphologies of galvanized coating and structural properties of corrosion products were observed with scanning electron microscope and X-ray diffraction spectrometer, respectively. Results showed that under the temperatures of 20~60℃, the corrosion currents of galvanized flat steel increased with the temperature rising. The corrosion rate at 60℃ was 0.8408 mA?cm-2, which is 2.9 times larger than that at 20℃. The corrosion rate dropped after reaching the maximal value of 1.95 mg?cm-2?d-1 when the exposure time was 60 d. The major corrosion form of galvanized coating was pitting corrosion, then some corrosion pits was converted into etch pits. Main corrosion products of white rust were ZnO and Zn5(OH)8Cl2?H2O, while those of red rust were Fe+3OOH and Fe3O4 with a small amount of Zn5(OH)8Cl2?H2O being also detected.

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grounding materials, galvanized flat steel, corrosion, neutral salt spray test

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