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Nuevo revestimiento de cromo galvánico modificado con diamantes resistente al desgaste


Oferta Tecnológica
Un instituto de investigación búlgaro con más de 50 años de experiencia en investigación y desarrollo de productos especiales ha desarrollado una nueva tecnología para aplicar un revestimiento de cromo galvánico modificado con nanodiamantes. La principal ventaja de este recubrimiento es que posee mejores propiedades físicas y químicas, pudiendo aplicarse en objetos expuestos a un fuerte desgaste abrasivo y/o entorno adverso. Se buscan centros de investigación interesados en establecer acuerdos de investigación para desarrollar proyectos conjuntamente y socios industriales con el fin de establecer acuerdos de cooperación técnica para adaptar el producto.


Innovative Hard and Wear Resistant Chromium Coating Modified With Nanodiamonds
A Bulgarian research institute with more than 50 years´ experience in R-Y-D of specialised products has developed a new technology for applying modified galvanic chromium coating. The main advantage is the improved physical -Y- chemical properties of the coating which can be applied on items exposed to strong abrasive wear and/or severe environment. They seek research cooperation agreements with research institutes for project development and technical cooperation with industry to adapt the product.
The Bulgarian research institute has broad experience in the development of innovative coating and metal related technologies and products. The unit also has long-term experience in international projects.

Chrome plating is a method that involves the application of a thin layer of chromium to another metal or material - for example, steel, aluminum, brass, copper, or even plastic - through electroplating. It is employed principally for two main things: for decorative uses and for engineering purposes. Additionally, it is done to provide a great degree of toughness on any kind of surface to augment wear resistance, lessen friction, offer anti-galling properties, and increase decay resistance. Chromium plating has wide application - in household and industrial conditions: automotive industry, in household appliances, decorations, electrical wires and related products, etc.

Chromium plating has many advantages. However, it comes with a few disadvantages, too. Though it is durable, it can become quite brittle especially when applied too thinly: it is prone to microcracks usually appear on it and which causes it to break. Another disadvantage is that it has a slow rate of deposition so when chrome is used to cover other surfaces; a lot of coats are often needed because of its slow rate of deposition.

Using the technology developed in the institute the chromium coating is produced by electrolytic process. Nanodiamonds are then added to the electrolyte. Nanodiamonds are the most suitable for this purpose, having the entire set of unique properties differing them from known fillers. The nanodiamonds have supersmall sizes (3 to 10 nm), almost spherical shape without outstanding cutting edges, they have large specific surface area (to 450 m2/g) and high surface energy. Thus, the coating adheres very strongly to the substrate surface. It is homogenous with controlled thickness usually within the range of 25 - 30 µm. There are no cracks and pores in it. The hardness of the surface is increased from 250 MPa for carbon steel C45 to 11500 MPa for the chromium coating modified with nanodiamonds. And also the wear resistance of this coating is 10 times bigger than that of carbon steel. This coating possesses high corrosion resistance in corrosive environment - 9 grade out of 10 according to EN ISO 9227/2006.

The ratio of the chromium anhydrate to the sulphuric acid is specified in a certain proportion as it produced the highest yield in relation to the current density. The nanodiamond particles are added to the electrolyte as a water suspension and their concentrations in the chromating solution is also specified in order to achieve best wear resistance.

The research unit seeks research cooperation agreements for joint project development with other research institutes (to test and model the technology further) and industrial partners; technical cooperation agreements - verification in industrial conditions.
Advantages and Innovations:
· The coating is homogenous; its thickness can be controlled and usually is within the range of 25 - 30 µm. There are no cracks and pores in comparison with the widely used method.
· The wear resistance of the coating is 6 times bigger than that of carbon steel. The wear resistance of the sintered ferrous products is increased also.
· The coatings possess high corrosion resistance in corrosive environment - 9 grade out of 10 according to EN ISO 9227/2006.
· The corrosion resistance of compacts made by PM process is normally poor, due to interconnected porosity. The modified with nanodiamonds chromium coating decreases significantly their corrosion rate.
Stage of Development:
Available for demonstration
Patent(s) applied for but not yet granted
CommeR Statunts Regarding IPR Status:
The patent applies for Bulgaria

Partner sought

Type and Role of Partner Sought:
- Type of partner sought: partners from the research sector and industrial partners;

- Specific area of activity of the partner: research and industrial partners working in the field of: coatings and nano-materials, production of steel items intended for corrosive environment;

- Task to be performed: research cooperation agreements joint project development with research institutes for testing and modelling of the technology and industrial partners for verification in industrial conditions; technical cooperation agreements with industrial partners for adaptation in industrial conditions as the Bulgarian research team will provide expertise and know-how in order to meet the new market needs.


Type and Size of Client:
R&D Institution
Already Engaged in Trans-National Cooperation:
Languages Spoken:


Technology Keywords:
02007010 Metals and Alloys
02007015 Properties of Materials, Corrosion/Degradation
02002002 Recubrimientos
02002015 Surface treatment (painting, galvano, polishing, CVD, ..)