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The company Ramisa Sas deals in Zink ingots, scraps and semi finished products.
The commercial Zink has a purity 99,8 % with the following minimal impurity: Pb: 0,05 - 0,10 %; Fe max. 0,012 %; Cd: 0,05 - 0,10 %; Cu max. 0,005 %; Sn max. 0,001 %; al max. 0,001 %.

In the market you can find also GOB Zink ingots (Good ordinary brand) with analysis on request.

Chemical composition of the primary Zink

Material in Warehouse London Metal Exchange

The Zink ingot handled in Exchange are SHG (Special High Grade) with the following specifications:
  • Zink ingots with purity 99,995 %
  • In ingots, blocks or plates with the maximal weight of 55 kg each.
  • In the Exchange is possible to deliver only the approved brands according the list of the London Metal Exchange.
  • Minimum quantity of the lot: 25 TO (Each lot must to be only of one brand)

More used typologies of zink scraps

Zink plates new loose or briquetted
Zink plates old loose or briquetted

Zn-spheres and semi-spheres for galvanic and other machining

Ramisa can supply:
  • Zn-spheres
  • Semi-spheres cylindrical 30 x 12/15 mm
  • Semi-spheres cylindrical 33 x 20 mm
  • Semi-spheres cylindrical 33 x 33 mm icophoto

Zn – alloys and Zamak

The term Zamak shows a group of alloys with high content of Zn particularly right for the die casting
The alloys of Zamak more used are the following:

G-ZnAl 14
Zn 96 % ; Al 4 % ; Cu 0 ; Mg 0,03 - 0,06 %

G-ZnAl14Cu1
Zn 95 % ; Al 4 % ; Cu 1 % ; Mg 0,03 - 0,06 %

G - ZnAlCu3
Zn 93 % ; Al 4 % ; Cu 3 % ; Mg 0,03 - 0,06 %

Zn-anodes for cathodic protection

The company Ramisa supply Zn-anodes and Zn-Al-anodes for cathodic protection in various forms and dimensions (bars, ingots, armbands anodes), for industrial sector, naval sector and pleasure boating.

The cathodic protection

The cathodic protection is a technique of prevention for the electrochemical corrosion that is applied to the metallic structures in contact with environment with electric conductivity.
Consist in move on the direct current between an electrode (anode) and the surface of the structure to protect (cathode). This current reduce the electric potential of the metallic surface, until to cancel the corrosive phenomena. The technique of the cathodic protection was originated in United Kingdom in the 1824, affirms itself in U.S.A. in the following century, and in all the world between 1960 and 1970. In Italy the cathodic protection was applied initially protect the lead sheath of the telephone cables, around the 1930, and subsequently for the protection of oil pipeline, gas pipeline, aqueducts and structures exposed to the corrosion risk.

Application method of cathodic protection

For the correct application of a cathodic protection system and for the containment of the costs is important the coating or the painting of the structure to protect. For this reason, in operation of the dimension and of the outside environment, are applied 2 systems:
Sacrificial Anodes System: without electric energy and consist in to connect the surface to protect with a metal with a less noble electric potential. Considered the short difference of the value between the two metals, the essential condition to work is that the electrolyte has a very low resistance value. This condition is always present with marine water, where the sacrificial anodes are very used with success, less in the earthly, which value of resistivity is always too high and make the system unable. The usually metals utilised for to protect the steel are in marine water the Aluminium and the Zink. In the earthly normally is used the Magnesium for its best working out.
Impress current system: The supply of the protection current happen through a cathodic feeder which negative pole is connected the structure to protect and an the positive pole the anodic earth plate. This system needs the electric energy, but has a high result that permits the application in the earth and for the protection of structures with considerable dimension. The vantages caused are in function of the current that the plant can deliver. Decisive is the resistance of the circuit, that depend for the almost totally from the resistance of the anodic earth plate.