ELECTROCHEMICAL PERFORMANCE OF AZ41 MAGNESIUM ALLOY SACRIFICIAL ANODE AT VARIOUS TEMPERATURES

J Chin Soc Corr Pro

1997, Vol. 17

Issue (3): 167-172 DOI:

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ELECTROCHEMICAL PERFORMANCE OF AZ41 MAGNESIUM ALLOY SACRIFICIAL ANODE AT VARIOUS TEMPERATURES

GONG Jinbao XU Naixin ZHANG Chengdian (Shanghai Institute of Metallurgy; Chinese Academy of Sciences; Shanghai 200050)TANG Baixiang (Nanjing Dolomite Mine)

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Abstract Electrochemical performance of AZ41 magnesium alloy sacrificial anode in saturated calcium sulfate-magnesium hydroxide solution was investigated over the temperature range from 20℃ to 80℃ by galvano-static polarization technique. The potential, current efficiency and surface morphology of the anode after corrosion were not significantly affected by temperature. Current density did not alter current efficiency, while higher current density shifted the potential towards noble and altered corrosion morphology. At various temperatures AZ41 anode was always in the active state and passivation was not observed. XRD showed that the only corrosion product on anode surface was Mg(OH)2. These results gave helpful hints for application of the anode at elevated temperatures.

Key words: Magnesium alloy sacrificial anode Cathodic protection Temperature effect

Received: 25 June 1997

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GONG Jinbao XU Naixin ZHANG Chengdian (Shanghai Institute of Metallurgy; Chinese Academy of Sciences; Shanghai 200050)TANG Baixiang (Nanjing Dolomite Mine). ELECTROCHEMICAL PERFORMANCE OF AZ41 MAGNESIUM ALLOY SACRIFICIAL ANODE AT VARIOUS TEMPERATURES. J Chin Soc Corr Pro, 1997, 17(3): 167-172.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1997/V17/I3/167

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