Digby Macdonald Engages Packed House with Plenary Lecture

March 27, 2019

By Sammy Miles, Managing Editor in Chief, CORROSION journal

2019’s Plenary Lecturer, Digby D. Macdonald, kicked off Tuesday. Macdonald presented to a packed house about the initiation of pitting corrosion and the capabilities to accurately predict passivity breakdown.

Macdonald focused on aluminum-lithium (Al-Li) alloys, commonly used in the aerospace industry to help with light weighting. He guided the audience through the formation of blisters on the surface of alloys, and the seven reactions that occur according to the Point Defect Model. He discussed how we can predict the distribution of breakdown on the surface of the alloys.

Macdonald commented that many of the pits will “die,” comparing the lifecycle of humans and pits when they are in direct competition for resources with others close by.He noted that cracks nucleate at dead pits and discussed the influence of other compounds on the breakdown potential.

Macdonald concluded by stating that no only can we predict passivity breakdown locally,we have the tools to do it accurately.

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