Sea Water Testing of Al-Zn, Al-Zn-Sn, and Al-Zn-In Sacrificial Anodes

In this manuscript, the influence of gallium content additions of Al-Zn-In-Mg alloy was investigated through electrochemical techniques and microstructure observation in 3.5 wt% NaCl solution. The results indicated that Al-Zn-In-Mg-0.03Ga alloy has the best discharge performance among all alloys. We propose that this is due to the fact that gallium addition to the Al-4Zn-In-Mg alloy improves the discharge activity of the alloy as well as elevating its anodic efficiency. In particular, the effect of gallium addition to improve discharge activity tends to be a parabolic curve, in which there is an increase when the gallium is first added that rises to the maximum anode current efficiency of about 98.25% whenever gallium content is 0.03 wt%.

Download Full-text

Intergranular Dissolution of Zinc Alloy Sacrificial Anodes in Sea Water at Elevated Temperature

British Corrosion Journal ◽

10.1179/000705979798276095 ◽

1979 ◽

Vol 14 (1) ◽

pp. 46-50 ◽

Cited By ~ 6

Author(s):

V. Ashworth ◽

C. G. Googan ◽

J. D. Scantlebury

Keyword(s):

Elevated Temperature ◽

Sea Water ◽

Zinc Alloy ◽

Sacrificial Anodes

Download Full-text

Activation of an Al-Zn-Mg-Li alloy by the Presence of Precipitates to be used as Sacrificial Anode

MRS Proceedings ◽

10.1557/proc-654-aa3.5.1 ◽

2000 ◽

Vol 654 ◽

Cited By ~ 1

Author(s):

S. Valdez ◽

M. A. Talavera ◽

J. Genesca ◽

J. A. Juarez-Islas

Keyword(s):

Electron Microscope ◽

Uniform Distribution ◽

Room Temperature ◽

Sea Water ◽

Al Alloys ◽

Sacrificial Anode ◽

Nacl Solution ◽

X Ray ◽

Sacrificial Anodes ◽

Scanning Electron

AbstractThis work reports the influence of microstructure on the electrochemical efficiency of Al- alloys to be used as sacrificial anodes. The microstructure of as-cast Al-ingots was characterized by X-ray diffractometry and scanning electron microscope (equipped with WDS microanalysis facilities). The electrochemical behavior was investigated in 3% NaCl solution simulating sea water at room temperature. Regarding microstructure, X-ray diffractometry detected the presence of the α-Al phase, and the τ-Al2Mg3Zn3, Mg7Zn3 and δ-AlLi precipitates. SEM observations confirmed the presence of α-Al dendrites with τ-Al2Mg3Zn3 and Mg7Zn3 particles in matrix. In interdendritic regions, it was observed the presence of the eutectic α-Al + τ-Al2Mg3Zn3 plus some primary Mg7Zn3 particles. δ-AlLi particles were identified at this step only by X-ray diffractometry. Finally, it was detected that an uniform distribution of precipitates in the α-Al dendrites together with an uniform distribution of a fine eutectic gave as a result in as-cast ingots an electrochemical efficiency up to 61.4 %.

Download Full-text