Abstract
Superhydrophobic surface was obtained on pretreated magnesium alloy substrates via Nano silver deposition and electroless Ni-P plating followed by stearic acid modification. The surface with hierarchical structure had a water contact angle of 157.8° and exhibited excellent superhydrophobicity. The surface morphology of the sample, the chemical compositions and wettability were characterized by scanning electron microscopy (SEM), XRD (X-ray diffraction), Fourier transformed infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and water contact angle measurement. The potential polarization curves revealed the corrosion resistance of superhydrophobic sample was enhanced as the corrosion current density decreased by 2 orders of magnitude.
Highlights
Magnesium and its alloys have been important engineering materials used in aerospace, electronics and medical implant due to their excellent properties such as light weight, low density, high specific strength and good conductibility.[1,2,3] But magnesium is an active mental and its poor corrosion resistance has become a main drawback for their extensive applications
The as-prepared magnesium alloys were activated by 385mL/L hydrofluoric acid (HF) solution (40.0 wt.%) at ambient temperature for 10 mins
Main elements of the coating surface were observed by X-ray photoelectron spectroscopy (XPS)
Summary
Magnesium and its alloys have been important engineering materials used in aerospace, electronics and medical implant due to their excellent properties such as light weight, low density, high specific strength and good conductibility.[1,2,3] But magnesium is an active mental and its poor corrosion resistance has become a main drawback for their extensive applications. To widen the application of magnesium and its alloys, different surface coatings were formed and used as corrosion prevention to for them by various kinds of methods including micro arc oxidation,[4] chemical conversion[5] and polymer coating[6] etc. Karthik et al.[32] presented an approach to fabricate a superhydrophobic composite coating on aluminum surface via electroless copper deposition followed by laurylamine modification. Through stearic acid modification, superhydrophobic surface with a water contact angle of 157.8◦ was prepared This method is easy to handle and cost-effective because no sophisticated exquipment and expensive reagents are involved. It may have great application value for the mass fabrication of superhydrophobic surfaces
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