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Surface
treatments
of metals

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TRIVALENT
CHROMIUM
CONVERSION COATING

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Chromate passivation is a pretreatment that protects metals from corrosion and the substances in the atmosphere, thereby maintaining their high electrical conductivity unchanged. This process protects non-ferrous metals from the formation of a thin passivation film on their surface, that allows organic finishing layers, such as enamel or paint, to bond to the metal.

Metals treated: zinc, cadmium, aluminium, copper, brass, bronze, silver, and magnesium

TITANIUM
ELECTROPOLISHING

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The electropolishing makes titanium more resistant to corrosion and high temperatures and increases its tensile strength and biocompatibility. This process removes a controlled amount of material from the external layer, thereby eliminating surface imperfections, embedded contaminants, sharp edges and burrs, cracks and micro-holes, which could lead to corrosion.

Advantages:
  • Elimination of burrs on medical devices
  • Microfinishing
  • Ultra-cleaning
  • Increased
    corrosion resistance

ALUMINIUM
ELECTROPOLISHING

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Anodised aluminium ensures more abrasion resistance, easier maintenance, hygiene, and is more aesthetically pleasing, thanks to its shiny colours. We at Alticolor always recommend an electropolishing treatment, which further improves performance in terms of the artefact’s cleanliness, corrosion-resistance, and shiny colours.

Advantages:
  • Corrosion resistance
  • Abrasion resistance
  • Clean, bright,
    and decorative surface
  • Improved aesthetics
    of the material

STEEL
ELECTROPOLISHING

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Electropolishing is used also to improve the functionality of series 200, 300, and 400 stainless steel. Without electropolishing, stainless steel parts would have burrs and other surface defects that could compromise performance. In fact, this process provides components with a polished, smooth, and extra clean finish that reduces chances for corrosion significantly.

Advantages:
  • Corrosion resistance
  • Increased fatigue strength
  • No burrs
  • Maintenance of the
    detail’s dimensions
  • Improved roughness value
  • Clean, bright,
    and decorative surface

steel
and titanium
passivation

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Passivation improves the stainless steel and titanium surface’s corrosion resistance by dissolving the iron inserted in the surface during forming and other processes. In fact, passivation consists in immersing stainless steel or titanium components into a nitric acid or citric acid solution. This treatment dissolves the iron and restores the original corrosion-resistant surface, forming a thin layer of transparent oxide.

Advantages:
  • Corrosion protection
  • Clean surface
  • Removal of iron and other metal contamination
  • No rust
  • Surface ready for
    subsequent finishes

Sandblating
of metals

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Sandblating of metals is used to remove old paint, slag, rust, and imperfections from surface of small size objects through a pressurized fluid with compressed air and sand, giving back to the objects their original appearance. The process is used as a way to prepare a surface prior to possible painting or protective treatments.

Advantages:
  • More even finish
  • Improvement of aesthetic qualities of surfaces
  • Sharp edges smoothing
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