Stainless steel (SS) have been widely used in marine structures and food industry due to its high corrosion resistance and excellent mechanical strength. Marine structures such as ships, ocean engineering and offshore rigs, are easily attacked by crude oil generated by oil spills and SS vessels applied in food industry are fouled by the organic matters in the fluid. Here, fish-scale-like SS surfaces with superhydrophilic and underwater superoleophobic property, including 316 L SS mesh and 304 SS plate, are designed by a facile chemical-based oxidation method. The obtained SS surfaces show excellent underwater anti-crude-oil-fouling property and thermal stability. Furthermore, the obtained 316 L SS mesh can effectively separate crude oil/water mixture solely driven by gravity. Significantly, the as-prepared SS surfaces possess robust antifouling and self-cleaning property during multiple cycles with the aid of Fenton-like catalytic reaction between Fe (III) and H₂O₂ or calcination at high temperature. Therefore, the fish-scale-like SS surfaces show great potential in a wide range of fields, such as marine antifouling, oil-water separation and food industry.

不锈钢（SS）由于其高耐腐蚀性和出色的机械强度而被广泛用于海洋结构和食品工业。诸如船舶，海洋工程和海上钻井平台之类的海洋结构很容易受到溢油产生的原油的攻击，而食品工业中使用的SS船则受到流体中有机物的污染。在这里，通过一种容易的基于化学的氧化方法来设计具有超亲水性和水下超疏油性的鱼鳞状SS表面，包括316 L SS网眼和304 SS板。所得的SS表面显示出优异的水下抗原油污垢性质和热稳定性。此外，所获得的316 L SS筛网可以有效地分离出仅由重力驱动的原油/水混合物。显着地，₂ O ₂或在高温下煅烧。因此，鱼鳞状的不锈钢表面在海洋防污，油水分离和食品工业等广泛领域中显示出巨大潜力。