Failure Behavior and Damage Mechanism of Acrylic Polyurethane Coating in Tropical Marine Atmospheric Environment

Abstract

Acrylic polyurethane coating was exposed to the tropical marine atmospheric environment for 24 months, and the physical, chemical and protective properties of the coating were investigated. The results demonstrated that the appearance, adhesion and protective property of the coating were degraded rapidly in the early exposure stage, and then changed slowly in the late exposure stage. During the filed exposure test, the ultraviolet irradiation was a major contributor to polyurethane chain scission of the coating, and the chain scission was mainly characterized by the rupture of C-N bonds. Moreover, the thermal stability of the coating was less affected by the tropical marine atmospheric environment.

Adhesion and tribological characteristics of modified polyurethane coating on composite substrate

“…The thermal degradation of the polyurethane coating can be divided into two main stages, each involving specific reactions during the decomposition process. Hard segment degrading is what is responsible for the initial stage, which includes urethane groups and hydrogen bonding [3,14]. This stage commences at 236°C and concludes at 320°C, with the highest temperature degradation rate of weight loss occurring at 275°C (t max1 ).…”

“…For surface wettability and improving adhesion and bond strength, various surface treatment techniques have been addressed in recent years [6][7][8][9][10][11]. Adhesion properties (cross-cut, pull-off adhesion and peel strength), corrosion resistance, water immersion studies, tribological performance (taber abrasion and pin-on-disc), tensile properties, DSC, FTIR and TGA studies, WCA were investigated and reported by a few authors [12][13][14][15][16][17][18][19][20][21][22].…”

“…Hydrophobic and superhydrophobic-modified PU coatings were developed by the researchers to better understand the failure behaviour and mechanism of PU coating when the coated panels were subjected to marine and atmospheric conditions [14,[23][24][25][26][27][28] Surface roughness and gloss studies are the important characteristics to study to understand the visual effects of the coatings [29]. As we know the tribology of polymers differs from metals in terms of normal load, sliding speed and temperature (polymer has low melting point compared to metals).…”

Investigating Different Local Polyurethane Coatings Degradation Effects and Corrosion Behaivors by Talaromyces funiculosus via Wire Beam Electrodes

“…Thanks to their barrier effect against corrosive media and their inhibition effect on corrosion reactions, PU coating is also an ideal candidate utilized in mitigating the corrosion of metals [ 5 , 6 ]. However, the factors of light, oxygen, microorganisms, temperature, and moisture can damage the cross-link structures of PU and accelerate the formation of blistering and chalking [ 7 , 8 ]. Among them, the first three factors dominantly contribute to the degradation of PU in natural environments [ 9 , 10 ].…”