Evaluating the Performance of Aluminum Sacrificial Anodes with Different Concentration of Gallium in Artificial Sea Water

Abstract

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%.

Artificial neural network modelling to predict the efficiency of aluminium sacrificial anode

“…It is important to note that while preparing the dataset, we manually surveyed the literature pertinent to the current efficiency measurement of aluminium sacrificial anodes in different chemical compositions [1][2][3][4][5][6][7][8][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. We carefully checked the current efficiency, chemical composition, and other environmental factors in each paper, including pH, dissolved oxygen (DO), temperature, and pressure.…”

“…The role of these activator elements is to help the uniform dissolution of the anode and also prevent polarisation [1][2][3]. Moreover, Elements such as Titanium (Ti), Manganese (Mn), and Rare-Earth elements such as Lanthanum (La) and Gadolinium (Gd) have been used to improve the performance of sacrificial anodes [4][5][6][7][8]. Vijayarani et al investigated the effect of Beryllium(Be) as an alkaline earth metal on the performance of aluminium sacrificial anodes.…”

Corrosion Behavior of Al Modified with Zn in Chloride Solution

“…In addition, the solution resistance (R s ) is in series with the rest of the elements. The mathematical expression is shown in Equation (7).…”

“…Zn and Mg are more active than Al; accordingly, these additions promote a decrease in the corrosion potential. In addition, Zn or Sn shift the pitting potential of Al to more negative values, which allows for using them as anodes in cathodic protection systems [7]. In this respect, it is essential to distinguish whether these effects are given by precipitated compounds in interdendritic areas or grain boundary zones, or by the solid solution of these elements in an Al matrix.…”