Failure Mechanisms of the Coating/Metal Interface in Waterborne Coatings: The Effect of Bonding

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.

Effect of Zinc Phosphate on the Corrosion Behavior of Waterborne Acrylic Coating/Metal Interface

“…Disbonding is the first sign of coating/metal interface corrosion [ 11 , 12 , 13 , 14 ], which is the most common form of failure that limits coatings, especially for long-term applications of waterborne coatings [ 15 ]. Hence, the ability to resist disbonding characterizes the coating service life, which is the main purpose for developing long-lasting water-based coatings suited for harsh environments [ 16 ]. Traditional coatings would exhibit significant cathodic disbonding under different environments that would affect the coating service life.…”

A new understanding of the failure of waterborne acrylic coatings

“…For the terpolymer coating, the diffusion of water in the coating is active, and it is easy for water to reach the interface between the coating and substrate. However, owing to the tight bonding (COOFe) between the coating and substrate in the terpolymer coating, 33 the reaction zone is limited to a small range. Therefore, even aer 300 days of immersion in 3.5 wt% NaCl solution, the terpolymer coating did not peel off from the substrate and only small blisters are formed (Fig.…”

Preparation of high hydroxyl self‐emulsifying polyester and compounding with acrylate

“…The advancement and development of production technology of waterborne system have made it have extensive potential. In addition to the low VOC content, water substitutes for organic solvents in coating formulations have the advantages of low odor, low flammability, low toxicity, low cost, easy cleaning, and so on …”