Corrosion

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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:

Corrosion Damage Equation.PNG

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 (ɳ), pit growth (Ʋ), and pit coalescence (c) by the following equation:

Corrosion Pitting Equation.PNG[1] [2] [3]

Journal Articles

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

Multiscale Modeling of Corrosion Damage

Tutorials

Q Fog Tutorial

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.
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