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Monday, 14 October 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Study compares aging of marine coating in natural and artificial sea water

Wednesday, 4 April 2012

Results showed that the kinetic of degradation was faster in the artificial medium while the water absorption was larger in natural seawater.

A new study compares the degradation of marine coatings in natural and artificial sea water

Source: Alexander Reitter - Fotolia.com

A new study compares the degradation of marine coatings in natural and artificial sea water

Source: Alexander Reitter - Fotolia.com

In order to study the effect of a visco-elastic stress onto the performances of a thick marine organic coating, free films and coated panels were immersed in natural seawater and in NaCl 3 wt.% solution at room temperature (20 °C), fixed temperature (45 °C) or under cyclic temperatures. Free films were analysed using uniaxial elongation and dynamic mechanical analysis (DMA), and the degradation of coated samples was investigated using electrochemical impedance spectroscopy (EIS). By comparing the degradation of coatings in natural and artificial sea water, it was shown that the kinetic of degradation was faster in artificial medium while the water absorption was larger in natural seawater. The results highlight the harmful impact of seasonal temperature variation in natural medium which could be explained by the development of internal stresses into the coating.

A paper on the new study will appear in "Progress in Organic Coatings”, Volume 74, Issue 2 (June 2012).

Read more about the new study

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