Abstract
Waterborne coating is the most popular type of coating, and improving its performance is a key point of research. Cathodic delamination is one of the major modes of failure for organic coatings. It refers to the weakening or loss of adhesion between the coating and substrate. Physical and chemical characteristics of coatings have been studied via scanning electron microscopy (SEM), atomic force microscopy (AFM), contact angle measurements, Fourier transform infrared spectroscopy (FTIR), and secondary ion mass spectrometry (SIMS). Early heterogeneous swelling at the metal-coating interface in non-defective coated metals was elucidated using frequency-dependent alternating-current scanning electrochemical microscopy. Two types of coatings (styrene-acrylic coating and terpolymer coating) were compared. The effects of thickness, surface roughness, and chemical bonding on cathodic delamination were investigated.
Highlights
Organic coating is the most effective and economical method to protect metallic materials from corrosion [1,2,3,4,5,6]
ToCharacteristics analyze the characteristics of two resins after curing, the surface and cross-sectional shape of the twoTo resins were by scanning electron (SEM)and andcross-sectional atomic force shape microscopy analyze theobserved characteristics of two resins aftermicroscopy curing, the surface of the two resins were observed by scanning electron microscopy (SEM)
Upon comparing the surface changes in the s-1 and s-2 coating samples immersed in 3.5% NaCl (d) and the occurrence of solution, we found that(c)the surface roughness of the substrate decreased, microbubble declined
Summary
Organic coating is the most effective and economical method to protect metallic materials from corrosion [1,2,3,4,5,6]. The protective coating can isolate the metal substrate from corrosive media [7], provide electrochemical protection (inhibition [8] and cathodic protection [9]), and exhibit an adhesive function [10]. Organic coatings degrade under aggressive environments because of underfilm corrosion, which can shorten the service life of coatings [11,12,13,14,15]. Studies [10,16] have shown that the main reason for the anti-corrosion role of coatings is not physical isolation, but the adhesion of coatings is fundamental to its protective effects.
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