The process of applying metallic coating using metal-containing gels is characterized by high deposition rate and serves to obtain durable protective and decorative metallic coatings with increased hardness and wear resistance. Obtained metallic coating represents nonporous understressed layer with improved surface structure. Distinctive feature of given technology is the possibility to apply metallic coating on any limited portion of the area without necessity to remove or dismantle the part, especially when utilization of conventional tank deposition method is impossible or economically inadvisable.
Inclusion of special component – 8 nm — nanodiamond particles into gold-bearing gel provides non-porosity, corrosion resistance and high level wear resistance of resulting metallic coating. Due to this fact, thickness of surfaces obtained using gold-bearing gel may be significantly reduced if compared to conventional gold-plating technologies, whereas addition of nanodiamond particles, do not affect product appearance and service life, therefore allowing considerable expansion of coated product range and providing wide opportunities for commercial application of given technology.
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Nano-dispersed deep cleaning diamond , water concentrate, type М1 Nano-dispersed deep cleaning diamond , water concentrate, type М2 |
Method: high temperature treatment of nana-diamond in gas atmosphere; |
Oxidized forms of carbon: 0,8% |
Galvanic technologies (Au, Ag, Pt, Ro, Cr), superpolish composition |
TECHNICAL AND ECONOMIC CHARACTERISTICS:
| Main indicators | Units | Gold-plating electrolyte 24kt | Gold plating gel 24Kt | Gold-plating gel 24Kt (with nano diamonds) | |
|---|---|---|---|---|---|
| 1 | Addictive amount (by weight) | % | 0,11 | 0,13 | 0,42 |
| 2 | Coating destiny | g/cm2 | 18,51 | 18,57 | 18,58 |
| 3 | Resistivity at 20°С temperature | Ommm2/m | 0,024 | 0,024 | 0,025 |
| 4 | Abrasion at 0,1-n. (10 gr.), abrasion longitude is 1000 m | mg | 39 | 37 | 12 |
| 5 | Vickers hardness (HV 0-5) | MPa/m2 (kg/mm2) |
425-615 (51-75) |
565-750 (63-82) |
1530-1750 (151-178) |
- Micro-hardness of composite coating - 160-180 kg/mm
- Effective thickness of gold coating: 0.2-0.8 mcm
- The comparative durability of composite gold coating with 0.2-0.3 mcm nano-diamond particles is equivalent to standard 1-1.1 mcm gold coating
- Content of nano-diamond particles in the coating – 0.3-0.6%
- Specific consumption of nano-diamond particles:
-0.8 % of deposited metal by weight - 0.6-1.2 g per 100 m2 of coating (d=0.1 mcm)
Considering that thin (0.3-0.4 micron) coatings have high durability and low costs, it is possible to use thin-layer composite gold-plating with the addition of nano-diamond particles for the coating of various items and pieces, including numerous accessories, costume jewellery, souvenirs, badges, insignias, buttons, various household goods, etc.
In addition to increased hardness and durability, deposited gold coating has the high electro-physical properties of fine metal. This is the main advantage of composite gold-plating, with the addition of nano-diamond particles, over gold-based coatings or other types of composite additives, obtained using different technologies. It has been established through experiments that deposited gold coatings, with the addition of nano-diamond particles, are characterized by the following indicators: specific resistance, transient resistance, solder flowing coefficient etc, at the level of fine electrical gold. This enables the utilization of gold plating gel with the addition of nano-diamond particles for electric purposes as well; for example, when gold-plating various contact elements of electric, radio and electronic devices, which enhances the reliability and service life of the units and allows for a reduction of 3-4 times in gold consumption, as a result of the decrease in coating thickness.
- Possibility to apply gold to steel and alloys, which requires multistep preliminary surface preparation in the case of the conventional tank coating method
- Possibility to apply metallic coating to parts or items, which are oversized for coating in available electroplating bath or tank
- Possibility to perform the deposition process when the utilization of the tank deposition method is impossible or economically unviable
- Possibility to perform the deposition process up to a dozen times faster than when using the conventional tank electroplating method
- Possibility to apply or build-up a metal layer on any organic section of a metal surface area
- Possibility to apply coating directly “on-site” without any necessity to remove or dismantle the part
- Possibility to choose from 8 base metals and numerous alloys
- High level of hardness and durability of the resultant metallic coating
- Improved surface structure of the metallic coating
- Minimization of problems related to waste disposal
- Excellent adhesion to numerous metals and alloys
