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Metal surface treatments

Minifaber employs suppliers specialised in cold sheet metal forming and surface treatments for metal.

Minifaber employs suppliers who have extensive know-how in the metal surface treatment field.

The purpose of these metal treatments is to grant the product an excellent finish that, not only provides aesthetic value, but increases its durability, eliminating harmful oxidation processes.

Specifically, Minifaber can provide the surfaces treatments listed below on aluminium, stainless steel, copper, iron and special alloys:

Metal galvanising

In general, zinc plating is the process by which a metal artefact is coated with zinc ("galvanised") in order to preserve it from galvanic corrosion. There are several steps to follow to perform this metal surface treatment: the most common method is hot-dip galvanising, in which the object to be galvanised is immersed in a zinc bath at 450°C, from which it will come out coated in both the external and internal surfaces. Through the galvanic process an iron-zinc alloy is formed, much more resistant than a normal coating film and hardly corrupted by external agents. There are also other galvanising processes: cold and spray galvanising, methodologies that do not actually have the same features in terms of final quality and durability when compared with hot-dip galvanising. Potentially, any metal artefact can be protected by undergoing this process.

Metal nickel plating

Like galvanising, also nickel plating is a surface finish that involves the dipping of the metal artefact in a nickel bath, in order to make it much more durable and corrosion-resistant, typical features of nickel. Nickel plating distinguishes between electrolytic nickel plating and chemical nickel plating, the second one being more precise and better fitting to the geometry of the piece, which is why it is much more widespread.

Metal chrome plating

The coating of a metal object from a thin layer of chromium can have both decorative and functional functions. This metal surface treatment is obtained through galvanic deposition in an electrolytic bath. The chromium plating aims at preventing the passivation (corrosion) of the metal object, improving its resistance and durability. The chromium bath is usually performed in a chemical compound such as chrome acid or chromium trioxide.

Metal silver plating

Silver plating is carried out by galvanic or electrolytic process and, like other surface treatments for metal, is based on the same principles of galvanising or chromium plating. This process makes it possible to obtain an excellent result, due to the conductive and protective qualities of silver. In addition, it is also possible to operate a delimited and selective silvering of particular areas of interest on one piece. To block the process of sulphurization, typical of silver, it is necessary to make a further step with a process of passivation.

Metal burnishing

Normally used to improve the aesthetic appearance of already worked parts and to protect against corrosion of atmospheric agents, burnishing is that chemical treatment that darkens in the particular shiny black-blue colour iron and carbon steel artefacts. In the past, this process was obtained in a very coarse way, exposing the piece to be burnt directly on flame, moving it when it had reached the desired shade of blue. Today it is carried out through galvanic treatments and immersion in chemical baths.

Metal phosphatization

Phosphatization is a common metal surface treatment for iron and ferrous alloys, as well as universally used as a preparation treatment for the painting of steel sheet in the automotive industry. Phosphatization is a chemical process in which the surface of a metal material is altered by the phosphate crystals that bind chemically to the metal substrate, improving its properties in terms of resistance to corrosion and wear.

Metal painting: cataphoresis – powdering

Varnishing treatment that significantly increases the corrosion resistance of metal objects or current conductors through the coating of an epoxy or acrylic resin. This surface treatment ensures greater protection against rust of metal. It is a very widespread technique in the automotive industry.

Metal polishing

Surface finishing treatment of metals that gives a glossy and smooth final effect. It is usually done starting from an initial phase in which the artefact is processed by deep cleaning (grinding or passage with abrasive paste) to be descaled and polished on the entire surface.

Metal peening

Peening is used to increase the fatigue resistance of metal components. The blasting occurs through the violent cold jet of spherical balls on the artefact, causing a microscopic plastic deformation that helps to sustain residual tension.

Metal sanding

Metal surface treatment that, in some ways, is similar to metal peening, even if in the metal sanding the most superficial part of the metal object is hit violently by a jet of sand and air. The purpose is to completely remove a particularly ruined/corroded area of a metal surface. The same procedure is applied on a compact disc to avoid retrieving data that it contains.

Metal anodizing

In anodizing a protective oxide layer is formed on the metal surface. The process is induced by electroplating and is commonly used on aluminium, zinc, magnesium and other metals.

Stainless steel electro-polishing

The electro-polishing of stainless steel is a surface treatment that consists in removing the surface layer of stainless steel (between 10 and 40 microns) in order to make it more resistant to corrosion. As a treatment in which the material is removed instead of applied, it is also referred to as " reverse galvanic process of deposition".

Industries

Minifaber finishes metal surfaces for the following industries:

  • Electromechanics
  • Vending
  • Kitchen robots
  • Medical
  • Gas distribution
  • Professional lighting
  • Home appliances
Minifaber, 50 years of cold forming process know-how on small and large quantities of metal. Contact use for an estimate and feasibility study.
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