Work

Effect of ytterbium on the microstructure and efficiency of Al–Zn anodes in different chloride concentrations by DNVGL-RP-B401 methods

Year: 2026

Type: article

Abstract: along the grain boundaries, resulting in a smoother and more uniform microstructure. The corrosion rate of samples containing 0, 1, 2, and 3 wt% of Yb was 0.38348, 0.12049, 0.10367, and 0.059231 mm per year based on measurements of potentiodynamic polarization in 3.5 wt% NaCl electrolytes. A decrease in the corrosion rate is experienced as the increased content of Yb is incorporated into the formation of a more uniform grain structure, which forms a more homogeneous anodic dissolution. Based on the anode efficiency test carried out according to the DNVGL-RP-B401 standard, the efficiency of the sacrificial anode increased with the content of Yb. In a solution of 3 wt%, the anode efficiency of alloys containing 0, 1, 2, and 3 wt% Yb is 59.35%, 81.46%, 89.14%, and 94.74%, respectively. In contrast, testing in a 3.5 wt% NaCl solution resulted in lower anode efficiency: 54.70%, 74.80%, 85.45%, and 91.44%, respectively. These findings illustrate that Yb microalloys effectively improve the performance and anode capabilities of sacrificial aluminum in chloride-rich environments.

Source: RSC Advances

DOI: 10.1039/d6ra01903j