Why surface treatments?

As a key link in the production chain, surface treatment makes it possible to considerably increase the properties of a product, whether it concerns the aesthetic or technical aspects. This may include, for example, an improvement in hardness characteristics, wear resistance, corrosion resistance, or a change of color on the product.

As such, surface treatment operations are generally a finishing operation. The companies of this domain arrive at the end of the chain and are, for the most part, specialized subcontractors in one of the ways of the sector. Nevertheless, for practical reasons, there are also a large number of workshops directly integrated internally in the production chain.


An extensive covered area

The area covered by surface treatments is huge. Surface treatment can be defined as any operation that modifies the characteristics, by structural modification or by adding a material to the surface, of a product. This concept therefore covers the following types of treatments:

  • Coatings (contribution of material with the exception of paintings). This category is divided into two parts: wet coatings (electrolytic and chemical deposits, molten metal immersion) and dry coatings (thermal spraying, vacuum deposition, reloading, and plating).
  • Painting (classified in wet coatings)
  • Conversion treatments (wet) – Structural transformation treatments (melting, surface hardening, mechanical treatments)
  • Thermochemical diffusion treatments (diffusion of metals and metalloids)

Because of its equipment, CITRA is preferentially turned towards coatings, wet type (electrolytic and chemical deposits) and dry (thermal spraying and vacuum deposits) and conversion treatments. Nevertheless, it can also meet the needs in the field of thermochemical diffusion treatments with the support of the SPCTS laboratory.