The influence of temperature and dissolved oxygen on the electrochemical nature of Al–Zn–In–Ga galvanic anode

Abstract

The microstructure and electrochemical features of Al-Zn-In-Ga anode at different temperatures and dissolved oxygen concentrations were validated via scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and electrochemical tests in artificial seawater. The results show that the corrosion surface of Al-Zn-In-Ga alloy is relatively uniform at a temperature of 4 °C and dissolved oxygen of 2.5 mg l −1 ; accordingly, current efficiency is higher, but the cracking phenomenon is watched. In a solution of 25 °C and 7.3 mg l −1 dissolved oxygen, the content of In decreases enormously at the grain boundary, while Ga and Zn content increases sharply, which leads to the rugged surface.

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

“…This was attributed to the occurrence of intergranular corrosion and the resulting increase in weight loss of the sacrificial anode [18]. Zhang et al demonstrated in their research on Al-Zn-In Series Sacrificial Anodes that an increase in temperature results in a decrease in anode efficiency [30]. In their research on aluminium sacrificial anodes, Wang et al found that increasing the cathode-to-anode surface ratio leads to an increase in the current efficiency of sacrificial anodes.…”

“…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.…”