Comparison between ECO (Electro Chemical Oxidation) and PEO (Plasma Electrolytic Oxidation) technologies published
Comparison between two advanced surface treatment processes for Aluminium has been presented in a recent paper “Phase transitions in alumina films during post-sparking anodising of Al alloys” downloadable at: https://bit.ly/3XrTR0Y.
Traditional Plasma Electrolytic Oxidation (PEO) treatment has been compared with a novel Electro-Chemical Oxidation (ECO) technology that aims to avoid sparking/arcing phenomena and provide surface layers with superior mechanical properties. Data on industrial applications of ECO technology can be found at www.nanolitic.com.
ECO (Electro Chemical Oxidation) for Additive Manufacturing presented
Additively Manufactured (AM) lightweight components require enhancement of their surface properties such as wear and corrosion resistance for most application. AM techniques provides aluminium with peculiar compositions and morphology which causes difficulties in using traditional surface treatments such as anodising or galvanic plating. ECO (Electro Chemical Oxidation) technology provided by Cambridge Nanolitic (www.nanolitic.com) enabled to significantly improve surface properties of AM aluminium.
Microstructural and tribological properties of ECO ceramic coating of additively manufactured Aluminium alloy A357 have been presented by a University of Bologna group headed by Prof Carla Martini in a recent publication Anodizing by Electrochemical Oxidation (ECO) of the Laser Powder Bed Fusion‑processed A357 aluminium alloy: microstructural characterization and dry sliding behaviour http://bit.ly/3Hl7Yzu.
Hydrogen embrittlement should be taken seriously
Hydrogen is believed to be a fuel of the future providing carbon neutral energy to industries, households and particularly transport vehicles. Major technical problem for its transportation, storage, and handling is hydrogen-induced cracking, embrittlement of a metal. That can cause catastrophic failures of metal components that are in contact with H2. Today the problem of Hydrogen Embrittlement (HE) is addressed by selection of metals that are less prone to HE such as several aluminium alloys and even coating of steel parts by aluminium. An alternative way of preventing HE can be a coating of metal with barrier layers that do not allow hydrogen to attack metal. Cambridge Nanolitic (www.nanolitic.com) plan to apply their original nanoceramic technology and 15 years of experience in metal surfacing to develop a coating for prevention of hydrogen embrittlement. Company is open for collaboration.
After years of comparative studies UNIBO researchers headed by Prof Carla Martini identified that Electrochemical Surface Oxidation (ECO) treatment of Cambridge Nanolitic (www.nanolitic.com) provides most compact oxide ceramic layer with wear resistance an order of magnitude higher than next best PEO surface layer (block-on-ring dry sliding tests against 100Cr6 bearing steel).
Friction Coefficient of the ECO surface was about 40% lower.
Remarkably, no decrease of fatigue strength was observed for ECO treated samples by comparison to the untreated alloy with the same surface roughness (4-point rotating bending fatigue, ISO1147). Detailed results of the study to be published in 2021.
Modern textile machinery is facing an ever-growing need for (1) increase of productivity and (2) dealing with new highly abrasive materials like synthetic fibres.
Increase of manufacturing speed requires use of much lighter materials such as Aluminium or even Magnesium instead of heavy steel and ceramic for moving parts of textile machinery. Light metal parts have lower inertia and enable to move components much faster, increasing productivity and reducing energy consumption. Use of light metals is limited by their low wear resistance, particularly in case of abrasive yearn, such as denim or synthetic fibres. Modern surface treatments for light metals used for textile components such as plasma sprayed ceramic, hard anodising, chrome and nickel coatings are known for decades and reached their performance limits.
A quantum leap in providing light metal components with record high wear resistance was secured by introduction of novel ECO-ceramic coating which was immediately appreciated by a number of leading European manufacturers. Within a short time, ECO-ceramic became a coating of choice for a range of critical components in textile machinery such as shuttles, grippers, rollers, fingers, disks, etc.
Fine nanoceramic coating surface appeared to be yarn friendly and exceptionally wear resistant, well above traditional surface treatments. Environmentally safe innovative electrolytic process enables to apply dense, highly adherent ceramic layer on components of practically any shape. Cambridge Nanolitic (www.nanolitic.com) the developer and supplier of ECO-ceramic coating is providing textile manufacturers with unique possibilities to design highly productive versatile machinery and light durable components.
Comparison of tribological properties of ECO-ceramic coating applied by Electro Chemical Oxidation (ECO) vs Hard Anodizing (HA) and Plasma Electrolytic Oxidation (PEO) was presented by Prof Carla Martini (https://www.unibo.it/sitoweb/carla.martini/en), University of Bologna at ECHT 2019 Surface Engineering Conference (http://www.aimnet.it/echt2019.htm).
ECO-ceramic coating produced by Cambridge Nanolitic Limited (http://www.nanolitic.com) on Aluminium Alloy 6082 demonstrated at least 50% higher scratch and wear resistance in progressive load scratch test and dry sliding wear test.
Wear resistant coating for special alloys.
Aluminium-Lithium Alloy 2099 is a material of choice for motorsport and aerospace industries due to its unique combination of strength and lightness. Surface treatment of this alloy such as anodising or PEO is complex due to presence of Cu, Li and Zn in it.
Cambridge Nanolitic scientists developed an innovative electro-chemical oxidation (ECO) treatment for Al-Li 2099.
ECO process enabled to build 5 - 60 micron thick oxide ceramic layers on that alloy to provide it best in class wear and corrosion resistance.
This study is focused on comparison of the microstructural features and dry sliding behaviour of the oxide layers grown on the same aluminium alloys under different surface treatment conditions, comparing nanoceramic coating with conventional anti-wear surface treatments such as hard anodizing with PEO.
In collaboration with University of Bologna Dept. of Civil, Chemical, Environmental and Materials Engineering (DICAM) and Department of Industrial Engineering (DIN), Alma Mater Studiorum, Bologna, Italy.
In collaboration with University of Sheffield. Supported by Innovate UK.
Plasma processing is widespread for synthesis of high performance materials. For most common types of plasma reactors the electrodes must be robust and also of high tolerance of the uniformity of thickness of ceramic coating, particularly for multiplexed microreactors. The project explores the application of coating developed by Cambridge Nanolitic to achieve the necessary level of tolerance and durability, and will test the plasma reactor fidelity and performance on an exemplar application to produce ozone-rich microbubbles for “green” laundry cleaning and water sterilisation.
In collaboration with University of Manchester. Supported by Innovate UK.
Project explores the technical feasibility of a novel nanoceramic surfacing for titanium implants developed by Cambridge Nanolitic to enhance their biocompatibility and osseointegration.
Cambridge Nanolitic provides Ti implants with nanoceramic surface to effectively combine the best features of metal implants such as high mechanical strength and formability with high biocompatibility, corrosion resistance and aesthetics of ceramics.
Electronic substrates with nanoceramic dielectric insulation have a unique combination of high dielectric strength and thermal conductivity.
LED industry leaders expressed interest to Nanotherm TM substrates for solid state lighting application.
Investment for a spin off company was secured from a London based VC fund. Manufacturing plant for producing novel electronic substrates is built in Haverhill, Suffolk, UK
Cambridge Nanolitic developed an original technology based on controlled processes of self-assembly and self-organization of colloidal nano-components during the formation of their complexes with polyfunctional ligands in a bulk liquid phase for functionalisation of nanoceramic surfaces.