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Saturday, 31 October 2020
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Raw materials & technologies, Technologies

Performance of organic coatings upon cyclic mechanical load

Friday, 9 October 2020

Scienstists have demonstrated a methodology for the evaluation of coating resistance to an impact of repetitive mechanical stress.

A typical epoxy coating designated for ship hull protection has been tested. Image source: reverent - Pixabay (symbol image).

A typical epoxy coating designated for ship hull protection has been tested. Image source: reverent - Pixabay (symbol image).

A number of engineering structures fail due to the fatigue damage resulting from cyclic mechanical stress. However, as far as organic coatings are concerned this degradation factor remains underestimated. In the paper the authors propose a methodology combining global electrochemical impedance spectroscopy and local atomic force microscopy measurements for evaluation of coating resistance to an impact of repetitive mechanical stress.

Typical epoxy coating

Typical epoxy coating designated for ship hull protection has been tested in as-received state as well as after pre-exposure to elevated temperature. Application of atomic force microscopy-based approach helped to reveal and spatially localise the spots of organic coating degradation onset. The mechanism and process of defect formation and propagation has been shown on a microscopic scale.

The study has been published in Progress in Organic Coatings, Volume 146, September 2020.

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