Cromatura Moderna
Via Albert Einstein, 1
20010 San Giorgio su Legnano (MI)
Tel. 0331.401449
Fax. 0331.407941
Fill the form
Products catalogue
We operate in the fields of anodic
oxidation and related colouring, electrolytic galvanisation, tin plating,
chromate conversion of aluminium and zamak (zinc-aluminium-magnesium-copper)
alloys, using recognised products such as ALODINE; these treatments are carried
out in automated processing lines and their purpose is to provide high
protection standard against atmospheric elements; they also give a uniform
aesthetic appearance to the surfaces of the parts treated.
In addition, today, the chromate conversion
of aluminium and zinc-aluminium-magnesium alloys is carried out in accordance
with the latest regulations in effect (RoHS), avoiding the presence of
hexavalent chromium both in the processing baths and on the surface of the
parts treated.
Chromate conversion
Chromate and phosphate-chromate passivation
are protections that prevent attack of the metal surface by atmospheric
elements for a variable period of time, which is determined by the quality of
the metal treated and of the treatment carried out. The treatment does not change the material's
surface electrical conductivity.
Today, both chromate and phosphate-chromate
treatment can guarantee high levels of protection for the treated products.
Chromate or phosphate-chromate passivation
forms a film on the surface of the part treated, without altering the metal's
characteristics; in addition, it maintains the part's electrical conductivity
unchanged over time and increases paint adhesion.
Our company performs these treatments in
accordance with standards UNI 9921 and standards MIL C-5541E.
For additional information, please visit
the Chromate conversion page or contact us if you have any questions.
Anodic oxidation
The treatment consists of forming an oxide
layer on the surface of the part treated, through an electrolytic process.
This treatment generates a number of
characteristics:
- Aesthetic appearance: an excellent effect
of uniform colouration results when the treatment is performed on plates or
drawn wires
- Electrical insulation: the treatment
creates an electrical insulating barrier
- Hardness: the material's surface hardens;
a hard oxidation treatment creates an oxide film even harder than that provided
by traditional oxidation
- Colouring: this treatment can provide
colouring by immersion in suitable colouring baths or by printing with
absorption of inks. A further fixing stage ensures that the ink absorbed by the
material is not released
- Atmospheric elements: excellent resistance to salt fog; note that
the beach loungers used on the beach undergo this treatment and remain in
excellent condition for years.
For additional information, please visit
the Anodic oxidation page or contact us if you have any questions.
Galvanisation
Electrolytic galvanisation consists of
placing the objects to be galvanised (carefully cleaned by mechanical brushing
or by washing with alkaline solutions for degreasing and then with acidic
solutions for pickling) as the cathode in an electrolytic bath. The items to be
galvanised are placed on suitable frames and then immersed in the galvanising
bath. Bars of the metal to be deposited, connected to the anode, and soluble
salts of the metal to be deposited are placed in the bath (following some
geometrical criteria). When electrical
power is applied, the positive ions of the metal to be deposited migrate to the
cathode, where they lose their charge and are deposited in the form of a
continuous metal layer. On the other hand, the metal dissolves at the anode, to
generate dissolved ions, which replace those discharged at the cathode. The
overall reaction is an oxidation-reduction reaction, resulting from the anodic
oxidation of the metal which dissolves losing electrons and from the cathodic
reduction of the ions that deposit in the form of metal, acquiring electrons.
We can distinguish two important types of galvanisation, depending on the
chemical composition of the galvanising baths.
For additional information, please visit
the Galvanisation page or contact us if you have any questions.
Electrolytic tin plating
Tin plating can be used for products of
various kinds and sectors, from food processing to the general mechanical
industry.
The characteristics of this treatment are:
the possibility to solder using tin solder, for which it is an excellent base;
the ability to conduct electrical current, which makes it an excellent
treatment for electrical contacts; its compatibility with food products and the
fact that it can be used on products that come into contact with food and beverages.
The thickness of the treatment layer can
vary between 2 and 30 microns, always guaranteeing excellent flexibility of the
metal deposited on the part.
In some cases, the treatment is performed
first and then followed by bending or shearing mechanical operations. This
electrolytic treatment yields a polished
silver-coloured appearance.
For additional information, please visit
the Electrolytic tin plating page or contact us if you have any questions.
Sandblasting
This treatment is carried out with
stainless steel grit; its purpose is to increase the roughness of the part
treated, in order to improve paint adhesion.
To render uniform a surface that has an
unpleasant appearance in order to improve the subsequent treatment; to render
the surface matte in order to obtain a matte finish during the subsequent
treatment.
Simply eliminate rust, paint, or grease
residues form the part's surface.
For additional information, please visit
the Sandblasting page or contact us if you have any questions.
CM01
It is a surface deposition for copper and
bronze that provides a high degree of protection against corrosion; suitable
for food contact use.
- Very high corrosion resistance
- Suitable for food contact according to
NSF
- Surface hardness between that of nickel
and that of chromium
- Homogeneous deposition on the part's
surface
- Complies with Ministerial Decree of
21.03.1973 and subsequent amendments (determination of migration)
CM01 is an electrolytic deposition of
polished metal appearance with pink reflections; it resists browning.
It can be alternated with Chromium for some
decorative indoor and outdoor applications or for applications on electrical
contacts.
It resists well to wear and retains an oil
film that enhances this property. Due to the penetrating power of the baths and
to the deposition's good conductivity, it is used in the metallisation of holes
of printed circuits to partially replace gold.
The hardness of the deposit is between that
of nickel and that of chromium.
For additional information, please visit
the CM01 page or contact us if you have any questions.
You will find the details of all treatments
and their characteristics in the menu on the side.