The Corrosion Behavior of Anti-Graffiti Polyurethane Powder Coatings
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Anti-graffiti coatings have become more important. These layers must guarantee excellent corrosion protectionproperties, and graffiti must be easily removable, without reducing protection and aesthetic properties. Inthis study, anti-graffiti and corrosion behavior of two anti-graffiti polyurethane powder coatings were studied. These layers were deposited on aluminum substrate, with two different surface finishes, smooth, and wrinkled. The action of four different removers are investigated. Graffiti were drawn on coatings by means of redacrylic spray paint. Methyl-ethyl-ketone (MEK) and a “commercial” remover were the most effective solvents,in terms of graffiti removal capability, producing limited change in aesthetical surface aspect for smoothfinishing. The wrinkled surface was less resistant. Corrosion protection properties, after removal action andcontact with the remover, were evaluate by electrochemical impedance spectroscopy. After approximately5 hours, coatings were no longer protective due to formation of defects. To simulate the weathering effect,UV-B cyclic test (4 hours of UV exposure followed by 4 hours of saturated humidity at 50 °C) wereperformed for 2000 hours. Gloss and color changes were measured, and electrochemical impedance spectroscopymeasurements were performed after aging and graffiti removal.
Abstract
Anti-graffiti coatings have become more important. These layers must guarantee excellent corrosion protectionproperties, and graffiti must be easily removable, without reducing protection and aesthetic properties. Inthis study, anti-graffiti and corrosion behavior of two anti-graffiti polyurethane powder coatings were studied. These layers were deposited on aluminum substrate, with two different surface finishes, smooth, and wrinkled. The action of four different removers are investigated. Graffiti were drawn on coatings by means of redacrylic spray paint. Methyl-ethyl-ketone (MEK) and a “commercial” remover were the most effective solvents,in terms of graffiti removal capability, producing limited change in aesthetical surface aspect for smoothfinishing. The wrinkled surface was less resistant. Corrosion protection properties, after removal action andcontact with the remover, were evaluate by electrochemical impedance spectroscopy. After approximately5 hours, coatings were no longer protective due to formation of defects. To simulate the weathering effect,UV-B cyclic test (4 hours of UV exposure followed by 4 hours of saturated humidity at 50 °C) wereperformed for 2000 hours. Gloss and color changes were measured, and electrochemical impedance spectroscopymeasurements were performed after aging and graffiti removal.
참고문헌 (14)
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