Correlation between 3D Texture of Steel Substrate and TiN-Coated Surface with Various Coating Masses

Abstract

When producing thick Class II hot-dip tin coating, surface texture becomes smoother and more uniform. Amplitude characteristics of surface texture Sa, Sq and the core void volume (Vvc) decrease, number of surface peaks (characteristic Sds) decrease dramatically. These result from Sn particles filling in the surface irregularities. When producing thinner Class I hot-dip tin coating, characteristics of surface texture Sa, Sq increase, characteristic Sds slightly decreases, and characteristic Vvc slightly increases. These changes can be explained by the fact that Sn particles settle more efficiently onto peaks of irregularities. When producing very thin electrolytic coatings, the steel substrate and coating have identical surface textures for coating mass up to 3.42 g/m2.