Nickel plating equipment

Nickel plating equipment

Nickel plating common fault and analysis:

Nickel plating equipment

Nickel plating equipment

Pinholes, pitting and peeling:

Electro plating coating layer has pinholes, pitting and peeling is the most common failure which mainly caused by the following reasons:

(1) Improper heat treatment process:

In the machining process, anti-rust oil, cutting fluids, lubricating oil, grease, grinding fluid, release agents and dust, grinding dust adhesion on parts surface mixed stick together, forming a thick dirt. If the heating treatment does not remove the dirt, while it will sinter to obstinate solid oil rust after degreasing and very difficult to clean, when plating, the bubbles attached on the coating layer forming gas hold-type pinhole.

(2) Poor treatment before nickel plating equipment:

Workpieces surface after heating treatment will inevitably adhere a layer of grease, when the dust accumulated on the surface and mixed with grease stick together, as a long time, it is extremely difficult to clean, so that the workpiece surface will form unconspicuous tiny oil spots, when nickel plating bubbles formed on will cause pinhole. In addtion, when using mesh belt resistance furnace for quenching, parts surface grease dirt and dust particle mix to stick together, sintering refractory solid grease, when nitrate tempering, the above grease again mix with nitro base salt to form stubborn hot polymer, while it is difficult to complete remove above durt in nickel plating equipment, in addition, hydrogen bubbles easily adhered on it, so that make the nickel plating coating layer appears pinholes and pits, and as the bubble grew bigger, the nickel electroplating layer will be automatically burst, resulting in peeling phenomenon.

Nickel plating coating layer peeling off:

Such failures have two main possible reasons:

1, Poor adhesion of the coating with substrate;
2, Nickel electro plating brittleness, small ductility.
If the heating treatment is improper, it will appear difficult to remove dirt or pre electro plating cleaning is not complete, the dirt mixed in between substrate and coating, making very poor binding force coating layer and substrate, in subsequent assembly processing, easy peeling off.
If improper ratio or poor quality brightener, PH value too high, and if the cathode current density too large and bath temperature too low, all will result in the reduction of hydrogen ions in the cathode, then the state of atomic hydrogen to penetrate into base metal and coating, make the base metal and the coating toughness decreases and cause “hydrogen embrittlement” phenomenon. In addition, when too much impurities and decomposition in the nickel solution, will also have result in “hydrogen embrittlement” phenomenon.

Poor corrosion resistance:

Because of high porosity of nickel plating layer, only when the coating thickness exceeds 25 micron, there is non-porous. Therefore, a thin layer of nickel electro plating alone can not be used as a protective coating, preferably double-nickel electroplating and multi-layer.

Green corrosion:

After nickel plating, antirust cutting fluid will be used for sealing treatment, after rust-proof cutting fluid dry, the product will be formed green negative phenomena.

Inside hole exposed copper:

Because bright nickel plating deep capacity less than cyanide plating, after nickel plating, the bright nickel plating layer can not completely cover inside hole for copper, so it will cause products unhealthy expose copper inside hole negative phenomena.

Waste water system

Waste water treatment system

2

Waste water treatment system needed in plating machine industry:

In electro plating processes, there will be waste water generated and discharged. Therefore, to protect environment, and to ensure the harmonious development of construction projects and environmental protection, need to set up Waste water treatment system.

Waste water treatment system Design principle:

A, Based on customers’ waste water quality parameters, and discharge standards which meet local standard to design waste water treatment system.
B, Strive to save investment, equipment structure reasonable, low energy consumption, convenient operation and management, low operating cost.
C, Using scientific processing technology, to make the whole system run automatically under the control of microcomputer.
D, Adapt to the changeable feature of water quality and quantity, which can withstand impact load, and has the flexibility on operation.
Design requirements:
The water is clear and clean, no smell.

Waste water treatment system main structure and main devices:(Can be different according to requirements).

Waste water treatment system main structure:
Reaction pool:
Inclined plate precipitation pool;
Rapid filter;
Waste water lifting pump ( anti corrosion self-priming pump);
Reaction pool air agitation system;
Dissolve, dosing device;
Instrument  (PH monitor);
Electrical and control design.

Greening:

Around the waste water treatment facilities should also conduct greening work according to the needs, outside the structures exposed part to using the latex paint, for the purpose of the whole factory beautiful and uniform.

Environmental protection:

In order to prevent smell, piling of waste water must be cleared up;
In order to prevent the physical and mental health effects of noise environment, our design selection of low noise equipment, in order to meet the standards of environmental protection.

1

Constant current electrochemical reactivation in electroplating of gold

Constant current electrochemical reactivation in electroplating of gold:

In 1950 The United States Bureau of Mines, Zadra and other developed carbon-in-pulp process, which is put granular activated carbon directly into mixed slurry ore powder and cyanide pulp, to gernerate cyanide gold adsorb by activated carbon, through multiple reverse adsorption, concentration enrichment, then followed by desorption, to get gold, in this process, granular activated carbon can be repeated application of regeneration. 1973 US Homestake Mining Company built its first production CIP plant in extract gold. Then, South Africa has built a number of similar mines plant.

Gold electrochemical reactivation apparatus
Rectifier-Granular activated carbon electrochemical reactivation apparatus:

Rectifier is a apparatus to provide a consists of power supply of electrochemical reactivation in electroplating of gold from granular activated carbon. The electrical power was supplied by a potentiostatic controller and an accessory power supply. This unit was used as a transformer–rectifier to provide constant current.

Electroplating Exhause gas treatment systme 1

Fume exhaust device

Electroplating Exhause gas treatment systme 1

Our fume exhaust device tower are wildly used for hazardous gas purification treatment in chemical, electroplating, hardware, electric appliance, medicine, dyeing, telecommunications industries; as well as repugnant substance deodorization treatment for ammonia, sulfuretted hydrogen, phenol phosgene, formaldehyde, methylamine, etc..

The main action principle:

Send soup or water into spray nozzle through bump, then the sprayed fog liquid mixed with exhaust gas completely, to attain result by reaction, neutralization, absorption, washing, dissolution.