Exploring the viability of Mg-3Pb alloy as sacrificial anode for the cathodic protection of AZ31, AM60 and AZ91 Mg alloys

• DOI: 10.1016/j.apsusc.2025.162399
• Publication Date: 2025-01-14T00:12:26Z
• Authors: Marta García-Corr...; Raúl Reyes-Riverol; Federico R. Garcí...; José A. Jiménez; Santiago Fajardo
• Keywords: Galvanic anode

SF acknowledges the financial support under the Project PID2021-126166OB-I00 funded by MCIN/AEI/10.13039/501100011033 and by “ERDF A way of making Europe” (European Union), and the Grant CNS2023-144665 funded by MCIN/AEI/10.13039/501100011033 and by the “European Union NextGener ationEU/PRTR”. SF and RRR thank the CSIC for the financial support under the project PIE-20216AT012.<br/>The use of a custom Mg-3Pb alloy as a sacrificial anode for protecting AZ31, AM60, and AZ91 Mg alloys in 0.1 M NaCl solution was evaluated using surface characterization, mass loss, electrochemical measurements, and gravimetric H collection. The Mg-3Pb alloy exhibited consistently lower open circuit potential values than the protected alloys and demonstrated protection efficiencies over 95 %. No polarity reversal or cathodic activation was observed, despite increased anomalous H evolution. These findings confirm the effectiveness and viability of Mg-3Pb alloy as a sacrificial anode for the cathodic protection of AZ31, AM60, and AZ91 Mg alloys.<br/>