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Investigations on Aging Behavior and Mechanism of Polyurea Coating in Marine Atmosphere

School of Civil Engineering, Qingdao university of technology, Qingdao 266033, China
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Materials 2019, 12(21), 3636; https://doi.org/10.3390/ma12213636
Received: 5 September 2019 / Revised: 24 October 2019 / Accepted: 1 November 2019 / Published: 5 November 2019
(This article belongs to the Special Issue Advanced Coatings for Corrosion Protection)
In this investigation, the aging behaviors of polyurea coating exposed to marine atmosphere for 150 days were studied and the mechanism was analyzed. The influences on surface and mechanical properties, surface morphology, thermal stability behavior, as well as chemical changes evolution of the coating were investigated. By attenuated total reflectance fourier transform infrared spectroscopy (ATR–FTIR) and X-ray photoelectron spectroscopy (XPS), changes in the chemical properties of polyurea coatings before (PCB) and after 150 d (PCA) of aging were analyzed, and emphasis was given to the effect of aging on functional group change, the hydrogen bonding behavior, and phase separated morphology. The results displayed prominent chain scission during aging, such as N–H, C=O, and C–O–C and the hydrogen bonded urea carbonyl content showed a decrease trend. The relative content of soft and hard segments showed a significant change, which increased the degree of phase separation. View Full-Text
Keywords: polyurea; aging mechanism; morphology; chemical properties; phase separation; hydrogen bond polyurea; aging mechanism; morphology; chemical properties; phase separation; hydrogen bond
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MDPI and ACS Style

Che, K.; Lyu, P.; Wan, F.; Ma, M. Investigations on Aging Behavior and Mechanism of Polyurea Coating in Marine Atmosphere. Materials 2019, 12, 3636.

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