Study on the influencing factors of spontaneous wettability transition behaviour on metallic-based surfaces

Hydrophobic surfaces and coatings have attracted more interest in recent years due to their broad applications diverse areas. In many cases, a metallic surface would demonstrate reversible wettability from hydrophilic state hydrophobic spontaneously. However, the wetting behavior mechanism of are far clear. this work, 304 stainless steel (SS) Ni–Cu–P been chosen investigate intrinsic transition with help X-ray photoelectron spectroscopy (XPS) ambient air/vacuum storage treatment. The topographies, behaviors chemistry were studied systemically. results showed that water contact angle (WCA) variation as-prepared changing is largely associated specific area. recovery repellency related time constant which mainly depends on micro-scale convolution or roughness. Rougher tends accelerate adsorption airborne hydrocarbon species atmosphere, leading intensive WCA increase. study provides generic theoretical justification for relevant time-dependent studies.