Introduction to Surface Engineering

Surface engineering has emerged as a transformative field in materials science, enabling the development of components with tailored surface properties for enhanced performance, durability, and functionality. This chapter explores the motivations behind surface modification and key techniques, ranging from conventional coatings and diffusion processes to methods like physical/chemical vapour deposition, laser surface treatments, and electrical discharge coating. The chapter also highlights the wide-ranging applications of surface engineering across diverse sectors such as aerospace, automotive, biomedical, electronics, and food packaging industries. Recent trends are explored, including their growing role in energy systems and environmental sustainability. Specific advancements include the use of nanostructured adsorbents in wastewater treatment, surface-modified cathode materials for lithium-ion batteries, electromagnetic wave-absorbing MXenes, and surface-engineered gas sensors for hydrogen detection. These case studies illustrate how modern surface engineering strategies are enabling precision control at the micro-and nanoscale to achieve high-performance, multifunctional surfaces.