Electrospark Coating Techniques for Surface Engineering
Summary
Electrospark coating techniques harness pulsed electrical discharges to deposit or alloy material onto component surfaces, achieving metallurgical bonding with minimal heat input. These methods encompass electrospark deposition (ESD) and electrospark alloying (ESA), which facilitate rapid surface modification without compromising bulk properties. By selecting appropriate electrode materials—ranging from metals to ceramics—practitioners tailor coatings to enhance hardness, wear and corrosion resistance, and thermal stability. The microstructural features of deposited layers, including fine-grained phases and diffusion zones, are governed by process parameters such as discharge energy, frequency and pulse duration. Such control enables the repair of high-value parts and the creation of protective films on substrates that are sensitive to traditional welding or thermal treatments. Recent advances have broadened the technique’s scope to biomedical implants, aerospace components and energy-generation hardware, with emerging protocols that combine electrospark processes with laser or vacuum treatments to reduce porosity and improve adhesion. Global interest in sustainable surface engineering has driven the adaptation of electrospark methods for eco-efficient maintenance and functionalisation of machinery across diverse industries.
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Electrospark Coating Techniques for Surface Engineering publication trend
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Technical terms
Electrospark deposition (ESD): A pulsed micro-welding technique that deposits electrode material onto a substrate via controlled electrical discharges.
Electrospark alloying (ESA): A variant of ESD in which alloying elements are incorporated into the substrate surface to form a graded diffusion zone.
Diffusion zone: The subsurface region where atoms from the coating and substrate intermix, forming a gradated interface.
Metallurgical bond: A high-integrity junction created through partial melting and solidification, ensuring mechanical and chemical continuity.
Microhardness: A measure of a coating’s resistance to localised deformation, typically assessed by Vickers or Knoop indenters.
References
- Advancements in Electrospark Deposition (ESD) Technique: A Short Review. Coatings (2022).
- Research Progress in Electrospark Deposition Coatings on Titanium Alloy Surfaces: A Short Review. Coatings (2023).
- Preparation and Properties of Mo Coating on H13 Steel by Electro Spark Deposition Process. Materials (2021).
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