Year: 2017

Nickel plating in precision mechanics processing

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In precision mechanics processing, nickel plating is a treatment in which certain materials are subjected to modify the surface characteristics such as hardness and resistance to external agents. It is very useful in precision mechanics or precision mechanics for ensuring the corrosion resistance of manufactured pieces.
The process is distinguished chemical nickel plating and electrolytic nickel.

The first can be performed on various materials, from metal, glass and plastic. The procedure is also called electroless plating nickel and consist in a deposition of nickel without the use of electric current, but through the presence in the treatment of a chemical reducing agent, generally sodium hypophosphite solution. The main advantage is that the distribution of the thickness of nickel on the objects processed in the framework precsion mechanics is extremely uniform, even in the case of complex geometric shapes.

The electrolytic nickel plating in precision mechanics processing can only be performed on metal material. The pieces are immersed in specific baths and, through a passage of electric current, there atoms are deposited by a pure material bars, arranged according to some geometric principles. The nickel plating provides corrosion resistance that depends, in addition to the layer thickness, from its porosity, brittleness and adhesion

The galvanizing in CNC machines

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In CNC machines, the galvanizing is the process by which it is applied a zinc coating on a metal object, to protect it from galvanic corrosion. Generally coats the steel: being electronegative, and then that is less noble than steel, carries a cap for electrochemical action also called cathodic protection. Furthermore, forms a barrier that isolates the steel from atmospheric agents.

Not used CNC machining CNC machines for this process, but it is treated in the traditional way. One can distinguish various forms of galvanizing:
• Hot
• continuous hot.
• Electrolytic;
• cold;
• spray.

In the first case, we proceed by immersing the sheets or the products to be treated in tanks containing molten zinc at a temperature of about 450 ° C. That is continuous hot as the previous one, but is performed on tapes or steel wires that allow to manage many pieces.
The electrolytic galvanizing is achieved by immersing the material in an electrolytic solution that contains salts of zinc. Finally it creates a current flow that makes deposit the zinc metal on the workpiece surface.
That cold is not a galvanizing in the strict sense of the term, but it is more comparable to a painting of the bottom, while the spray provides that the molten zinc, finely pulverized, is sprayed on the steel surface, previously sandblasted to white metal