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Sunday, 22 September 2019
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Raw materials & technologies, Technologies

Reduced pressures influence film formation of cathodic electrodeposition paints

Wednesday, 22 February 2017

Within the last decades, cathodic electrodeposition paints have experienced extensive economic success – most prominently in automobile body coating.

The appearance of electrodeposition coatings shows clear pressure dependence. Source: pixabay.com/CCO

The appearance of electrodeposition coatings shows clear pressure dependence. Source: pixabay.com/CCO

However, to date, it is not possible to calculate the deposition behaviour of cathodic electrodeposition coating materials exclusively from bath and application data, since the key mechanisms responsible for the film formation are not sufficiently understood.

New insights into the deposition behaviour

By performing coating experiments with cathodic electrodeposition paints at reduced pressures, in this work, experimental evidence for a pressure dependent procedure of film formation is given. Supported by charge-flow and current-time plots, this fact is attributed to the influence of the pressure-dependent volumes of the generated hydrogen bubbles, thus providing new insights into the deposition behaviour of cathodic electrodeposition paints.

The study is published in: Progress in Organic Coatings, Volume 104, March 2017, Pages 110–117

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