01691nab a2200181 4500 20260520001103.0 260224s2012 xxu Influence of lead on the microstructure and corrosion behavior of melt-conditioned, twin-roll-cast AZ91D magnesium alloy jun. 2012 06/09/2012 ; 06/09/2012 9 p. ; 548-556 The influence of lead addition on the microstructure and the corrosion behavior of a melt-conditioned, twin-roll-cast (MCTRC) AZ91D magnesium alloy has been investigated. Electron probe microanalysis revealed that lead-containing (magnesium plumbide [Mg2Pb]) particles were formed in the alloy and were concentrated mainly at the interdendritic boundaries. Scanning Kelvin probe force microscopy indicated increased surface potentials for the Al-Mn intermetallics, the Pb-rich particles, and the ß phase, relative to the adjacent a-Mg matrix, suggesting their greater nobilities with respect to the a-Mg matrix. Corrosion testing revealed that the corrosion initiated at the a-eutectic/lead-containing particle and a-eutectic/Al-Mn particle interface, as a result of galvanic coupling between the intermetallics and a-eutectic. Corrosion subsequently propagated into the primary a-Mg matrix. The ß-Mg17Al12 phase network at the grain boundaries acted as a corrosion barrier, restricting the propagation of corrosion from one grain to an adjacent grain, thereby contributing to an improvement in the corrosion resistance of the MCTRC AZ91D magnesium alloy. 6 Corrosion 68 ARTICULO Pawar, S. 52638 187304 187304 0 0 0 0 255123 BAAB BAAB 2026-03-06 200059415 0 200059415 2026-03-06 00:17:05 2026-03-06 ARTICULO