Electrochemical Polishing Surface Finishing 2026
Electrochemical Polishing Surface Finishing 2026
Electrochemical polishing is gaining strategic urgency as additive manufacturing proliferates and sustainability regulations tighten around hazardous acid baths. This dataset snapshot maps five principal sub-domains from plasma electrolytic polishing to dry and green electrolyte approaches.
Five Sub-Domains Driving ECP Innovation in This Dataset
Electrochemical polishing (ECP) encompasses anodic dissolution processes that selectively remove surface asperities from metallic workpieces, achieving sub-micron to nanometric surface finishes without mechanical contact. The field subdivides into conventional liquid-bath ECP, plasma electrolytic polishing (PEP), dry electropolishing (DryLyte®), hybrid electrochemical-mechanical processes, and green electrolytes using deep eutectic solvents or ionic liquids.
A universal governing mechanism — the viscous diffusion layer forming over the workpiece surface — creates differential dissolution rates between surface peaks and valleys. This viscous layer thickness is confirmed as the key parameter governing roughness evolution regardless of voltage or electrolyte concentration, as established in a study on universal factors determining surface roughness evolution during electrochemical polishing.
Among retrieved results, publications and filings span approximately 1998 to 2026, revealing three distinct innovation eras: a foundational semiconductor planarization phase (1998–2013), a development and diversification phase (2017–2021) broadening into additive manufacturing and green electrolytes, and an acceleration and green transition phase (2022–2026) concentrating on sustainability, SiC wafer finishing, and complex-geometry processing.
In retrieved records, China is the most active jurisdiction with filings from Zhejiang University of Technology, ACM Research (Shanghai), Dalian University of Technology, Hunan University of Science and Technology, and others. US activity in this dataset is concentrated in the 2003–2013 semiconductor era. Europe is represented primarily by Drylyte S.L.’s active 2024 EP pending filing.
Patent Activity by Jurisdiction and Innovation Era in Retrieved Records
Among retrieved patent records, China is the most active jurisdiction with multiple active filings spanning semiconductor, biomedical, and precision finishing. US activity in this dataset concentrates in the 2003–2013 era, while Europe and emerging jurisdictions show more recent activity.
Patent Filings by Jurisdiction — ECP Technology (Dataset Snapshot)
China accounts for the highest number of active patent filings in this dataset, with at least 8 named Chinese assignees compared to 5 US assignees (mostly inactive post-2013) and 1 active EP filer (Drylyte S.L., 2024).
↗ Click bars to exploreECP Patent Filings by Innovation Era (Dataset Snapshot)
Filing activity in this dataset accelerated from the 2003–2013 semiconductor foundational era through a 2017–2021 diversification phase, with the 2022–2026 acceleration phase showing the highest proportion of active (non-lapsed) patents.
↗ Click bars to exploreKey Application Domains for ECP Technology in Retrieved Records
Electrochemical polishing technology is applied across four major domains in this dataset: additive manufacturing post-processing, biomedical implants, aerospace and gas turbines, and semiconductor and advanced electronics finishing.
Additive Manufacturing Post-Processing
ECP applied to L-PBF and EBM parts in Inconel 718, IN625, Ti6Al4V, and 316L stainless steel is the single most prominent application domain in this dataset. Overpotential electropolishing of 316L and AlSi10Mg reduces Ra to 0.18 µm with ~70 µm thickness removal and nearly doubles compressive plateau stress in micro-lattices. Electropolishing of L-PBF IN625 in ionic electrolytes achieves Ra ≤ 6.3 µm (ISO N9) across all build orientations after 4 hours.
Additive ManufacturingBiomedical Implants Surface Treatment
Ti6Al4V EBM implant electropolishing reduces Ra from >24 µm to ~4.5 µm, yielding a 53% tensile plasticity improvement and enhanced bio-corrosion resistance. A 2024 Korean patent by Inter-Medi Co., Ltd. covers stepwise voltage electrochemical etching in chloride electrolyte for titanium orthopedic implants to enhance bone adhesion. Co-Cr cardiovascular stent electropolishing using ethylene glycol–sulfuric acid formulations is patented in China (2020, CN, active).
BiomedicalAerospace and Gas Turbine Blades
DryLyte® tape electropolishing was specifically developed for GTE compressor blade airfoil geometry maintenance, eliminating geometric defects caused by granule-media approaches. WC-Co cutting tool substrates for aerospace-grade machining are finished using dry electropolishing, retaining hardness and fracture toughness. PEP is applied as a pre-coating cleaning process for PVD-coated cutting tools, replacing ecologically harmful solvent baths per a 2019 publication.
AerospaceSemiconductor Wafer Planarization
Sony Corporation’s alternating ECP/CMP architecture (US, 2003–2007) and ACM Research (Shanghai)’s constant-voltage ECP mode (WO/SG active) address Cu damascene dishing in wafer planarization. Applied Materials Inc. patented endpoint detection for ECMP (US, 2003, inactive), with Shengmei Semiconductor Equipment (Shanghai) filing an active CN continuation (2015). A 2023 solid polymer electrolyte/CeO₂ ECMP study achieves ~15 µm/h material removal rate on 4H-SiC, approximately 10× that of conventional CMP.
SemiconductorsKey Patent Assignees in Electrochemical Polishing (Retrieved Records)
In retrieved records, Zhejiang University of Technology and ACM Research (Shanghai) Inc. / Shengmei Semiconductor Equipment (Shanghai) Co., Ltd. are among the most active assignees with multiple active filings. Chinese institutional and commercial entities account for the largest share of active patents in this dataset, spanning semiconductor, precision, and hybrid ECP applications.
Top ECP Patent Assignees by Filing Count — in Retrieved Records (Dataset Snapshot)
↗ Click bars to exploreZhejiang University of Technology
Zhejiang University of Technology holds two active CN patents in this dataset spanning 2020 and 2024. Their 2024 patent covers a three-electrode system controllable electrochemical-assisted magnetorheological ultra-precision polishing device for complex curved surface machining. Their earlier 2020 active CN filing established foundational hybrid electrochemical-mechanical processing approaches in their research program.
China — CNACM Research (Shanghai) / Shengmei
ACM Research (Shanghai) Inc. filed a WO application (2017) and an active SG patent (2019) for constant-voltage mode electrochemical polishing addressing Cu damascene planarization. Shengmei Semiconductor Equipment (Shanghai) Co., Ltd. holds an active CN patent (2015) for electrochemical polishing endpoint detection devices and methods. Both entities target wafer-level ECP for semiconductor interconnect processing.
China — CNSix Forward-Facing Directions Identified in 2022–2026 Records
Based on the most recent filings and publications (2022–2026) in this dataset, six forward-facing directions are identifiable: SiC wafer ECMP, dry electropolishing system maturation, complex-geometry hybrid processes, isotropic etching polishing, electrochemical thickening fluids, and eco-friendly electrode materials.
SiC Wafer ECMP for Power Electronics
A 2023 paper demonstrates environment-friendly ECMP using a solid polymer electrolyte/CeO₂ composite pad achieving ~15 µm/h material removal rate on 4H-SiC (0001), approximately 10× that of conventional CMP, without liquid harsh chemicals. As SiC demand for EV power modules surges, this represents a high-value emerging application. A 2026 IN pending application from Lovely Professional University further covers an ECMP system for polishing conductive materials.
Deep Eutectic Solvent Green Electrolytes
A 2:1 ethylene glycol–choline chloride DES outperforms 1 M H₃PO₄ for aluminum surface quality, while the same DES system achieves 91.1 ± 1.5% smoothing efficiency with a mirror finish for high-purity copper. For titanium, choline chloride–ethylene glycol (Ethaline) achieves Ra 5.7 nm at 20°C, and choline chloride–propylene glycol delivers Ra 37.92 nm from an initial 455.60 nm. A 2023 comprehensive review confirms green electrolytes are the primary frontier for AM part post-processing.
Conventional ECP vs. Plasma Electrolytic Polishing: Key Dimensions
Click any row to explore further.
| Dimension | Conventional Liquid-Bath ECP | Plasma Electrolytic Polishing (PEP) |
|---|---|---|
| Electrolyte | Phosphoric/sulfuric acid or salt baths | Dilute aqueous salt solutions (~200–400 V) |
| Operating Voltage | Low to moderate (typically <100 V) | High voltage ~200–400 V generating plasma-gas envelope |
| Environmental Profile | Hazardous acid waste; regulatory pressure increasing | No hazardous acid waste; described as ecological replacement in austenitic stainless steels |
| Polishing Rate | Standard bath rate; Jet-PEP delivers 6× increase vs. bath PEP | High processing speed; Jet-PEP configuration provides 6× rate vs. bath PEP |
| Surface Roughness (AM metals) | Ra 0.25 µm on SLM Inconel 718; Ra 0.18 µm on 316L/AlSi10Mg | Superior corrosion resistance on AISI 316L biomaterial vs. untreated surfaces |
| Geometry Suitability | Bath: flat/simple; ECFAP and jet variants for complex parts | Jet-PEP enables local polishing of complex geometries |
| Material Scope | Stainless steel, Ti alloys, Inconel, Cu, Al, WC-Co | Multi-material applicability confirmed; austenitic stainless steel well established |
| IP Landscape (Dataset) | Foundational Sony/Novellus/Applied Materials patents largely lapsed; ACM Research SG active | Primarily academic literature in dataset; limited dedicated PEP patent filings retrieved |
Frequently Asked Questions: Electrochemical Polishing Surface Finishing
A viscous diffusion layer that forms over the workpiece surface creates a differential dissolution rate between surface peaks and valleys. The specific thickness of this viscous layer is confirmed as the primary lever governing roughness evolution across all ECP sub-domains, regardless of voltage or electrolyte concentration.
PEP operates at ~200–400 V in dilute salt solutions, generating a plasma-gas envelope with no hazardous acid waste. It is described as an ecological replacement for conventional ECP in austenitic stainless steels and demonstrates superior corrosion resistance in simulated body fluid for AISI 316L biomaterial compared to untreated surfaces.
Overpotential ECP of 316L and AlSi10Mg 3D-printed parts reduces Ra to 0.18 µm with ~70 µm thickness removal. SLM Inconel 718 is reduced from Ra 17 µm to 0.25 µm under pulsed current. L-PBF IN625 achieves Ra ≤ 6.3 µm (ISO N9) across all build orientations after 4 hours in ionic electrolyte.
DES are acid-free electrolyte systems, such as 2:1 ethylene glycol–choline chloride, that replace phosphoric/sulfuric acid baths. For copper they achieve 91.1 ± 1.5% smoothing efficiency with a mirror finish. For titanium, choline chloride–ethylene glycol achieves Ra 5.7 nm at 20°C. A 2023 review confirms green electrolytes are now the primary frontier for AM part post-processing.
DryLyte® replaces liquid acid baths with solid polymer granules that absorb dissolved metal ions. Applied to WC-Co cemented carbides, it achieves sub-9 nm roughness with no corrosion damage to the metallic binder and retains 85% of core mechanical attributes. A dry tape electropolishing variant was developed for GTE blade finishing. Drylyte S.L.’s 2024 EP pending patent formalizes conductive surface regeneration methodology.
Sony Corporation’s multiple ECP/CMP alternation patents (US, 2003–2007), Novellus Systems’ controlled material removal patent (US, 2009), and Applied Materials’ endpoint detection patent (US, 2003) are all listed as inactive in this dataset. ACM Research (Shanghai)’s constant-voltage ECP mode (SG, 2019) and Shengmei Semiconductor Equipment’s endpoint detection (CN, 2015) remain active.
Data and insights on this page are based on a limited patent and literature dataset and are for reference only. Figures may not represent the complete technology landscape.