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CORROSION PROPERTIES OF AUTO GALVANIZED STEEL SHEET WITH VARIOUS BROKEN AREAS OF THE ZINC COATING

Hong Zhang

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Abstract

Research on the corrosion properties of the specimens of auto galvanized steel sheet with various broken areas of the zinc coating prepared by dissolution with a dilute hydrochloric acid solution were carried out in 5%NaCl solution in the present paper.The results show that in the initial period of time the corrosion mass-losses of the specimens with coating were higher than that of the specimen without coating,the loss of coating made the major part of contribution to the corrosion weigh-loss of specimen.The corrosion rates increased with the broken area of the coating and decreased with exposing time.In addition,the electrochemical characteristics of the duplex phase galvanic electrodes were studied by galvanic corrosion potential measuring, electrochemical impedance spectrum(EIS)and potentiodynamic polarization and compared with the corrosion results.

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What this paper is about

Research on the corrosion properties of the specimens of auto galvanized steel sheet with various broken areas of the zinc coating prepared by dissolution with a dilute hydrochloric acid solution were carried out in 5%NaCl solution in the present paper.The results show that in the initial period of time the corrosion mass-losses of the specimens with coating were higher than that of the specimen without coating,the loss of coating made the major part of contribution to the corrosion weigh-loss of specimen.The corrosion rates increased with the broken area of the coating and decreased with exposing time.In addition,the electrochemical characteristics of the duplex phase galvanic electrodes were studied by galvanic corrosion potential measuring, electrochemical impedance spectrum(EIS)and potentiodynamic polarization and compared with the corrosion results.

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Available abstract

Research on the corrosion properties of the specimens of auto galvanized steel sheet with various broken areas of the zinc coating prepared by dissolution with a dilute hydrochloric acid solution were carried out in 5%NaCl solution in the present paper.The results show that in the initial period of time the corrosion mass-losses of the specimens with coating were higher than that of the specimen without coating,the loss of coating made the major part of contribution to the corrosion weigh-loss of specimen.The corrosion rates increased with the broken area of the coating and decreased with exposing time.In addition,the electrochemical characteristics of the duplex phase galvanic electrodes were studied by galvanic corrosion potential measuring, electrochemical impedance spectrum(EIS)and potentiodynamic polarization and compared with the corrosion results.

Key concepts: Galvanization, Materials science, Corrosion, Coating, Galvanic cell, Metallurgy, Zinc, Dissolution

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