Numerical investigation of micro-galvanic corrosion in Mg alloys: Role of the cathodic intermetallic phase size and spatial distributions

Beura, Vikrant; Garg, P; Joshi, Vineet V.; Solanki, K N.

doi:10.1007/978-3-030-36647-6_34

Title: Numerical investigation of micro-galvanic corrosion in Mg alloys: Role of the cathodic intermetallic phase size and spatial distributions

Conference · Fri Mar 27 00:00:00 EDT 2020

DOI:https://doi.org/10.1007/978-3-030-36647-6_34· OSTI ID:1607692

Beura, Vikrant ^[1]; Garg, P ^[1];

^[2]; Solanki, K N. ^[1]

Arizona State University
BATTELLE (PACIFIC NW LAB)

Magnesium alloys are of increasing interest in structural applications due to their low-density, moderate specific strength and stiffness, recyclability, and high damping among other properties. However, the wide-scale applicability of magnesium alloys in structural applications has been limited due to many factors including its poor corrosion resistance. In this work, a numerical investigation to simulate the micro-galvanic corrosion behavior was performed to examine the influence of size and distribution of cathodic intermetallic phase (ß-Mg17Al12) in a Mg matrix. The ratio of cathodic to anodic surface area was kept constant in each simulation condition to understand the effect of size and spacing distributions. In general, fragmentation of a larger intermetallic particle into smaller ones was found to enhance the localized current density. However, the uniform distribution of this small intermetallic phase throughout the matrix was found to reduce the overall dissolution current density and hence, pitting corrosion severity.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1607692

Report Number(s):: PNNL-SA-147890

Resource Relation:: Conference: Magnesium Technology 2020

Country of Publication:: United States

Language:: English

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