Investigation of the Preparation of Steel-Based Superamphiphobic Surface by Ni-nSiO₂ Nanocomposite Electroplating

Abstract

In order to realize the preparation of a superamphiphobic surface on the steel substrate and simultaneously avoid damage to the physical properties of the steel substrate surface， a preparation process for preparing superamphiphobic surface on marine Q235 steel was proposed on the basis of Ni-nSiO2 nanocomposite electrodeposition technology. Firstly， a micro-nano double-roughness structure suitable for superamphiphobic properties was constructed on the surface of the steel substrate by nanocomposite electroplating and liquid phase deposition，and then the surface was modified with heptadecafluorodecyl trimethoxysilane. By designing a three - factor orthogonal experiment， the preparation process parameters that could realize superamphiphobic surface were obtained by changing the electroplating parameters (temperature， time， current) and analyzing the influence of each parameter on the surface wettability. Additionally， the microscopic morphology of the as-prepared superamphiphobic surface was analyzed by scanning electron microscopy. Results showed that when the current density was 12.5 A/dm2， the magnetic stirring speed was 200 r/min， the electroplating time was 50 min， and the temperature was 60 ℃， the as-prepared steel-based superamphiphobic surface presented a contact angle of 154° with water and a contact angle of 151° with oil. Under the above parameters， the combination of micro-nano rough morphology obtained through the composite electrodeposition process and low surface energy modification made the surface exhibited superamphiphobic properties.

Keywords

• superamphiphobic surface|nanocomposite electrodeposition|steel substrate surface|preparation process parameters