Integrated Computational Materials Engineering (ICME)
Corrosion of Magnesium
Objective
The objective of this research is to characterize and quantify the corrosion
mechanisms of magnesium metal and magnesium alloys as part of the larger goal
of establishing a corrosion model that will be able to predict the corrosion
damage of other metals and alloys. A multiscale modeling approach is taken to
understand the information from the various length scales and the bridges that
connect them. Three unique corrosion mechanisms are studied: general corrosion,
intergranular corrosion, and pitting corrosion. On the macroscale, general
corrosion can be quantified from the measured thickness loss of the sample over
time. Pitting and intergranular corrosion on the microscale can be analyzed
using Talysurf surface roughness testing, optical microscopy, scanning electron
microscopy (SEM) and ImageJ software, and the results applied to a corrosion
damage model of the following form:
Φpc = ηpνpcp
where the general corrosion (gc), pitting corrosion (pc) and intergranular
corrosion (ic) are considered. Using the model established by Horstemeyer et
al., the pitting corrosion is broken down into pit nucleation (ν), pit
growth (Ʋ), and pit coalescence (c) by the following equation:
Φc = Φgc + Φpc + Φic
Journal Articles
- Quantification of corrosion mechanisms on an extruded AZ31 magnesium alloy
- Corrosion Behaviour of Extruded AM30 Magnesium Alloy
- Corrosion Fatigue Behavior of Extruded AM30 Magnesium Alloy
- Structure–property quantification of corrosion pitting under immersion and salt-spray environments on an extruded AZ61 magnesium alloy
- Comparison of corrosion pitting under immersion and salt-spray environments on an as-cast AE44 magnesium alloy
Corrosion Video
Corrosion of RHA Steel
Objective
The objective of this proposed research is to characterize and quantify the corrosion mechanisms of rolled homogeneous armor (RHA) steel as part of the larger goal of establishing a corrosion model that will be able to predict the corrosion damage of other metals and alloys. A multiscale modeling approach will be taken to understand the information from the various length scales and the bridges that connect them. Three unique corrosion mechanisms will be studied: general corrosion, intergranular corrosion, and pitting corrosion. In this research, the ICME multiscale modeling approach is used to obtain all necessary bridging information for the problem at hand to determine the resulting structure-property relationships.[4]
Research Progress
Experiments in progress.
Journal Articles
- Rolled Homogeneous Armor
Multiscale Modeling of Corrosion Damage
- ICME Multiscale Modeling of Corrosion Damage
Tutorials
References
1. Song, W.; Martin, H. J.; Hicks, A.; Seely, D.; Walton, C. A.; Lawrimore
II, W. B.; Wang, P. T.; Horstemeyer, M. F. Corrosion behaviour of extruded AM30
magnesium alloy under salt-spray and immersion environments. Corrosion Science
2014, 78, 353–368 DOI: 10.1016/j.corsci.2013.10.020
2. Martin, H. J.; Horstemeyer, M. F.; Wang, P. T. Structure-property
quantification of corrosion pitting under immersion and salt-spray environments
on an extruded AZ61 magnesium alloy. Corrosion Science 2011, 53 (4), 1348–1361
DOI: 10.1016/j.corsci.2010.12.025.
3. Walton, C. A.; Martin, H. J.; Horstemeyer, M. F.; Wang, P. T. Quantification
of corrosion mechanisms under immersion and salt-spray environments on an
extruded AZ31 magnesium alloy. Corrosion Science 2012, 56, 194–208 DOI: 10.1016/j.corsci.2011.12.008.
4. Horstemeyer, M. F. Integrated Computational Materials Engineering (ICME) for
Metals: Using Multiscale Modeling to Invigorate Engineering Design with
Science. Wiley, 2012.