A superhydrophobic surface with a synergistic abrasion–corrosion resistance effect prepared by femtosecond laser treatment on an FeMnSiCrNiNb shape memory alloy coating
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Abstract
Preparation of superhydrophobic surfaces is one of the key methods to improve the anti-corrosion ability of coatings. Herein, a superhydrophobic surface with a synergistic abrasion–corrosion resistance effect is constructed by using a simple femtosecond laser (FL) treatment and surface spraying technology on an FeNiSiMnCrNb shape memory alloy (SMA/Nb) laser cladding composite coating. The influence of the superhydrophobic surface on the anti-corrosion ability was studied in strong acid and alkali and 3.5 wt% NaCl solution. An in-depth research study of the anti-corrosion mechanism reveals that the “air valley” formed due to the micro–nano structure significantly impedes the infiltration of the corrosive ions into the surface. Benefiting from the mountain-like structure, the obtained superhydrophobic surface has favorable superhydrophobicity (sliding angle ≈ 2.1°, contact angle ≈ 152°). Simultaneously, the surface shows substantial superhydrophobic durability during 100 times (500 cm) 400# SiC sandpaper abrasion. More importantly, the surface displays good thermal and chemical stability in a large range of temperature and pH, respectively. Therefore, this work provides an idea for enhancing the anti-corrosion ability of stainless steel.
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