Corrosion‐resistant and friction‐reducing performance of super‐hydrophobic coating on hot‐dip galvanised steel in a 3.5% NaCl solution

Abstract

Corrosion‐resistant and tribological performance of hot‐dipped galvanised steel (HDGS) in highly aggressive coastal and marine environments needs improvement. In this paper, the super‐hydrophobic coating with a contact angle of 150° and a sliding angle of <10° is fabricated on HDGS by a simple method that includes self‐assembly of stearic acid on oxidised HDGS. SEM and XRD are used to characterise the morphology and phase structure of the oxidised HDGS, respectively. Infrared microscopy is used to investigate the chemical bonding mode of stearic acid on the oxidised HDGS. It is found that super‐hydrophobic coating provides effective corrosion resistance for HDGS in a 3.5% NaCl solution. It also shows a lower friction coefficient with wear protection in a 3.5% NaCl solution, as compared with the bare HDGS.

Improving the Processability of a One-Step Hydrophobic Coating for Hot-Dipped Galvanised Steel for Industrial Applications

“…SiO2 can also be seen in the XRD pattern, showcasing that SiO2 has been encapsulated within the coating by physical action and not changing physical composition. The notable peak, which is observed in the uncoated sample and not the coated sample is that of zinc carbonate hydroxide and zinc hydroxide [6,13,[39][40][41]. This is created via the mechanisms: FTIR analysis was completed alongside XRD to corroborate the observation of carbonate ((CO3) 2− ) bonds within the uncoated sample, this data is presented in Figure 15.…”

The development of surface treatments on galvanised steel products for the automotive industry utilising a chemcoater

“…SiO2 can also be seen in the XRD pattern, showcasing that SiO2 has been encapsulated within the coating by physical action and not changing physical composition. The notable peak, which is observed in the uncoated sample and not the coated sample is that of zinc carbonate hydroxide and zinc hydroxide (88,100,(175)(176)(177). This is created via the mechanisms: This data provides validation that the white precipitate observed in Figure 62 can be mainly accounted to zinc carbonate hydroxide and zinc hydroxide formation on the surface.…”