THE EFFECT OF AC INTERFERENCE ON ELECTROCHEMICAL PERFORMANCE OF AZ41 MAGNESIUM SACRIFICIAL ANODE

J Chin Soc Corr Pro

1998, Vol. 18

Issue (1): 21-26 DOI:

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THE EFFECT OF AC INTERFERENCE ON ELECTROCHEMICAL PERFORMANCE OF AZ41 MAGNESIUM SACRIFICIAL ANODE

GONG Jin-bao XU Nai-xin ZHANG Cheng-dian (Shanghai Institute of Metallurgy; Chinese Academy of Sciences; Shanghai 200050)

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Abstract AC interference of various amplitudes was intentionally introduced during the standard current efficiency measurements for AZ41 magnesium sacrificial anode in a saturated calcium sulphate-magnesium hydroxide solution, to simulated the long-term environment around magnesium anodes installed in the backfill. Different forms of ac auxiliary electrodes led to different current distributions on the anode surface and thus resulted in different morphology after the anode was subject to galvanostatic dissolution. Under the influence of ac interference, working potential of the anode obviously shifted towards noble and even became nobler than the open potential of iron at greater ac density. Polarization curves obtained in a Na2SO4+K3[Fe(CN)6]+K4[Fe(CN)6] solution indicated that corrosion product film on the anode had the character of n-type semiconductor. The current efficiency of the anode significantly dropped with the increasing ac density. XRD analysis revealed that magnesium hydroxide was still the unique corrosion product in the simultaneous presence of dc and ac currents.

Key words: Cathodic protection Magnesium sacrificial anode AC interference

Received: 25 February 1998

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GONG Jin-bao XU Nai-xin ZHANG Cheng-dian (Shanghai Institute of Metallurgy; Chinese Academy of Sciences; Shanghai 200050). THE EFFECT OF AC INTERFERENCE ON ELECTROCHEMICAL PERFORMANCE OF AZ41 MAGNESIUM SACRIFICIAL ANODE. J Chin Soc Corr Pro, 1998, 18(1): 21-26.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I1/21

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