The influences of preparation on the bond strength of zinc twin-wire arc spray coating on steel.

摘要

Twin-wire arc spray (TWAS) is a process of depositing a metallic coating on a substrate. TWAS has a variety of applications for corrosion and abrasion protection. The bond strength between the coating and the substrate is essential since a coating's success relies primarily upon mechanical bonding of the coating to the substrate. Substrate preparation, coating thickness, and surface morphology are among the critical factors. This study focuses on characterizing coating adhesion strength as a function of substrate preparation. The influence of substrate preparation by grit blasting to enhance roughening of the substrate on the coating bond strength is investigated. A tensile adhesion test is used to measure bond strength of the coating. The relationship between substrate surface cleanliness and bond strength is explored. The surface profile is characterized by a 2-D profilometer. The coating interfacial and cross-sectioned microstructures are also examined with the use of a scanning-electron microscope (SEM).