Technology of electrochemical sedimentation of nickel-boron alloy on various products instead of gold, silver, palladium, chrome, nickel
Purpose
Drawing of protective, functional Ni-B coating on various metal surfaces: copper, brass, beryllium
bronze, kovar, steel, tungsten, aluminum and its alloys, etc. The technology of drawing Ni-B coating is
based on use of process of electrochemical sedimentation of the two-componential alloy characterized
by low transitive resistance, increased hardness, wear resistance, corrosion stability, good weldability
by ultrasound and soldering-ability.
bronze, kovar, steel, tungsten, aluminum and its alloys, etc. The technology of drawing Ni-B coating is
based on use of process of electrochemical sedimentation of the two-componential alloy characterized
by low transitive resistance, increased hardness, wear resistance, corrosion stability, good weldability
by ultrasound and soldering-ability.
Ni-B polycrystalline coating (from 1 up to 6 at. % of boron) is used in manufacturing printed-circuit-
boards (instead of gold and palladium coatings) or as a sublayer under gold, in manufacturing various
sorts of contacts and contacting devices (instead of gold and silver coatings).
boards (instead of gold and palladium coatings) or as a sublayer under gold, in manufacturing various
sorts of contacts and contacting devices (instead of gold and silver coatings).
Ni-B amorphous coating (from 16 up to 25 at. % of boron) is used in manufacturing tools, products of electronic mechanical engineering (instead of chromic coatings); refrigerators used in the process of manufacturing glass fiber; cutting disks for processing diamond raw material (to produce brilliants).
Characteristics
| Speed of coating sedimentation for baths: | |
| Stationary type, micron / hour | 25-50 |
| Drum-type and bell type, micron / hour | 5-10 |
| Temperature of sedimentation, degrees centigrade | 20-50 |
| Used boron-containing compound possesses high chemical stability and efficiency6-8 | |
| Micro hardness of a coating, GPa | 6-8 |
| After heat treatment (300 degrees centigrade), GPa | |
Wear resistance:
| Nickel - boron (under dry friction), cubic mm | 2х10 exp. - 10 |
| Nickel, cubic mm | 8х10 an item - 5 |
| Durability of adhesion Ni-B coating with aluminum conductor, g | 10-16 |
- Corrosion-resistant against influence of hydrochloric (sea) fog, atmosphere, condensed precipitation, change of temperature of environment (thermocycling);
- Technology of nickel - boron alloy sedimentation is characterized by significant money and material resource saving.
- Simplicity of operation of electrolyte and its long use in the process of correcting;
- Reduction of the production cost;
- An opportunity of carrying out coating amorthization (borating) at low temperature.
Application
Instrument making, microelectronics, radio engineering, exact electronic mechanical engineering
Foreign analogues
There are no known foreign analogues
Key words
Nickel; boron; electrochemical sedimentation; metal coating
Condition of production
Small-scale manufacture
Maintenance documents
Technological documentation
