Surface engineering is evolving beyond its conventional paradigm toward a multidisciplinary and integrative context, aimed at the simultaneous optimization of surface characteristics such as corrosion resistance, wear performance, and biological responsiveness. It is increasingly recognized that advanced engineering surfaces should be regarded as dynamic and functional systems in which multiple physicochemical, mechanical, and biological interactions occur simultaneously.1,2 Such surfaces should not be interpreted merely as passive materials, but rather as active systems operating within complex environments.3,4 Despite this conceptual shift, the development of surface engineering remains relatively slow, with individual functionalities often optimized independently, without sufficient consideration of their interdependence and practical implications.
From this broad perspective, the present issue would contribute to the ongoing transition toward a more sophisticated understanding of surface innovations. Instead of presenting a scattered feature of advances, the selected contributions collectively illustrate how surface design can rely on a multidimensional framework, where structure, chemistry, functionality, and application are closely interconnected characteristics of interest. It should be noted that such an approach is particularly important in advanced materials science, where performance requirements are no longer defined by a single variable, but instead arise from the simultaneous agreement of multiple, and sometimes competing, characteristics.
The featured article examines the aforementioned promising direction by addressing corrosion resistance and antibacterial functionality within a tailored surface architecture.5 By integrating ZnO nanorods with layered double hydroxide nanosheets on a magnesium alloy, the study demonstrates that surface engineering strategies can be extended beyond traditional barrier concepts toward multifunctional systems capable of interacting with biological environments. In this regard, the work highlights an important transition in the field, where surface modification is not limited to delaying degradation, but is also designed to actively influence biological responses and long-term performance in biomedical characteristics.
The second article provides a complementary perspective by focusing on the relationship between surface structure and mechanical performance.6 The introduction of bionic textures combined with boronizing treatment illustrates how bioinspired design principles can be translated into practical engineering solutions. It should be noted that the significance of this work is not confined to improved wear resistance alone, but extends to demonstrating that surface functionality can be achieved through design strategies that remain compatible with scalable and cost-effective processing routes. This aspect is particularly relevant in bridging the gap between laboratory-scale innovation and industrial implementation.
In a different yet related context, the third article emphasizes the importance of interfacial chemistry and process control in coating performance analysis.7 The investigation of surfactant-assisted electroless nickel coatings on magnesium alloys shows that subtle modifications in bath composition can significantly influence coating compactness, conductivity, and corrosion resistance. From this perspective, the study suggests that surface performance is often governed by finely tuned interactions at the interface, which may not be fully captured when considering bulk properties alone. Therefore, the precise control of interfacial phenomena is crucial, as minor chemical adjustments may lead to large functional improvements.
The fourth article extends the discussion toward sustainability by exploring the use of plant-derived extracts as corrosion inhibitors.8 The use of Pomelo peel extract highlights an alternative pathway in surface engineering, where environmentally benign and biologically derived materials are integrated into corrosion protection strategies. It should be noted that such approaches require careful consideration of both performance and practical complications, as the adoption of green materials does not inherently guarantee functional reliability. Therefore, this work contributes to the broader effort of aligning surface engineering practices with sustainability principles while maintaining technical effectiveness.
Overall, the articles collected in this issue suggest that future surface innovations will increasingly be viewed in terms of the ability to integrate multiple functionalities within coherent and well-designed surface systems. In this sense, surface engineering is progressively transitioning toward a paradigm in which materials are not merely protected or modified, but are systematically engineered to perform targeted functions within complex environments. Accordingly, it becomes necessary to move beyond simplified or single-parameter interpretations and to adopt more comprehensive frameworks that account for the interrelationships among structure, processing, functionality, application, and sustainability. From this perspective, the studies presented in this issue may be regarded as representative examples of how surface engineering can evolve toward a more mature and globally relevant discipline. Collectively, they highlight that innovation in this field is not solely defined by quantitative improvements in performance, but also by the ability to conceptualize and design surfaces as integrated systems capable of addressing advanced technological and sustainability challenges.
