Abstract
The production of metals is an essential process to contribute carbon dioxide emission. Being exposed in natural and industrial environment, metal endures corrosion, which in turn leads to significant material loss. Thus, protecting metal from corrosion is not just a matter of material preservation but also a critical aspect for promoting environmental sustainability. Acting as a barrier, traditional organic coating is widely adopted to prevent metal from corrosion. However, over time, the coating degradation contributes to the growing problem of microplastic pollution. Given these concerns, the challenge lies in developing sustainable, environmentally friendly methods for protecting metals from corrosion. Bioinspired slippery liquid-infused porous surface (SLIPS) has emerged as advantageous solutions for corrosion protection. In this study, firstly, a bioinspired superhydrophobic coating is constructed onto a highly active Magnesium-lithium (Mg-Li) alloy via a one-step electrodeposition. Following that, an edible beeswax-sunflower seed oil is used to form a composite oleogel-infused surface (OIS), one category of SLIPS. Traditional characterization, such as high-resolution transmission electron microscopy (HRTEM), and sophisticated X-ray computed tomography (X-CT) reveal the detailed microstructure and composition of the coatings. The corrosion resistance of OIS surfaces significantly surpasses that of superhydrophobic surfaces, as evaluated by scanning Kelvin probe (SKP), electrochemical impedance spectroscopy, and potentiodynamic polarization curve. The OIS exhibits a high corrosion inhibition efficiency of 99.99%, far exceeding that of the superhydrophobic surface. Furthermore, the OIS demonstrates self-healing capability, with waxy components undergoing phase transition to repair surface damage caused by scratching. This environmentally sustainable biomimetic coating affords versatility and long-term corrosion protection for Mg-Li alloy, paving a new way for their extensive utilization in various fields.
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