Understanding the role of Chloride in Corrosion: DFT, TEM and Morphological Instabilities

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• Prof. Laurence Marks
• Friday 03 May 2019, 15:00-16:00
• Goldsmiths 1, Lecture Theatre, Department of Materials Science & Metallurgy.

If you have a question about this talk, please contact Yonatan Calahorra.

It has been known for at least a century that chloride has a major effect on corrosion, often increasing the rate of attack by an order of magnitude or more. This has serious consequences, not just for corrosion in sea water but also within humans; they have similar chloride ion levels. The literature is full of conflicting models each developed with particular approaches focusing on one aspect of the problem, rarely looking at the larger picture. The focus of this talk will be to show that the different conflicting models are not in fact conflicting. Density functional theory calculations show that chloride plays a critical role in disrupting the hydrogen bonding networks at oxide surfaces by replacing chemisorbed hydroxide. This leads to a reduction in the surface free energy which promotes morphological instabilities, these later conclusions being supported by transmission electron microscopy and atom probe tomography results.

This talk is part of the Department of Materials Science & Metallurgy Seminar Series series.

This talk is included in these lists:

• Department of Materials Science & Metallurgy Goldsmiths' Seminars
• Department of Materials Science & Metallurgy Seminar Series
• Goldsmiths 1, Lecture Theatre, Department of Materials Science & Metallurgy
• Mats Sciences Lists

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