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Sacrificial Anode Stability and Polarization Potential Variation in a Ternary Al-xZn-xMg Alloy in a Seawater-Marine Environment

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Journal of Marine Science and Application 2016年第2期15卷 208-213页

作者： Abubakar Muazu Yaro Shehu Aliyu Malik Abdulwahab Abimbola Patricia Idowu Popoola Department of Mechanical Engineering Bayero University Kano P.M.B 3011 Nigeria Department of Metallurgical and Materials Engineering Ahmadu Bello University Zaria PM.B 1045 Nigeria Department of Chemical Metallurgical and Materials Engineering Tshwane University of Technology Pretoria X680 South Africa Department of Mechanical Engineering Ahmadu Bello University Zaria P.M.B 1045 Nigeria

In this paper, the effects of zinc （Zn） and magnesium （Mg） addition on the performance of an aluminum-based sacrificial anode in seawater were investigated using a potential measurement method. Anodic efficiency, protection efficiency, and polarized potential were the parameters used. The percentages of Zn and Mg in the anodes were varied from 2% to 8% Zn and 1% to 4% Mg. The alloys produced were tested as sacrificial anodes for the protection of mild steel in seawater at room temperature. Current efficiency as high as 88.36% was obtained in alloys containing 6% Zn and 1% Mg. The polarization potentials obtained for the coupled （steel/Al-based alloys） are as given in the Pourbaix diagrams, with steel lying within the immunity region/cathodic region and the sacrificial anodes within the anodic region. The protection offered by the sacrificial anodes to the steel after the 7th and 8th week was measured and protection efficiency values as high as 99.66% and 99.47% were achieved for the A1-6%Zn-l%Mg cast anode. The microstructures of the cast anodes comprise of intermetallic structures of hexagonal Mg3Zn2 and body-centered cubic A12Mg3Zn3. These are probably responsible for the breakdown of the passive alumina film, thus enhancing the anode efficiency.

关键词： sacrificial anode anode efficiency protection efficiency polarization potential intermetallic phase alloying elements theoretical current capacity flee electron seawater surface films

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