All our dolphin filters, manufactured in stainless steel, undergo two surface treatment processes: micro-shot peening and passivation.

Micro-shot peening

In stainless steel objects, such as our filters, micro-shot peening is used as a surface finishing treatment. 

• This process creates a homogeneous surface, while removing a thin layer of metal (around 1 µm) and creating a rough surface that will improve the adherence of following chemical deposition treatments.
• As a cold deformation process,  it is obtained by impacting the surface with spheres with the goal to leave residual compression forces in the superficial layer of the metal. The result is an increased fatigue resistance.

Pasivación

Passivation is a chemical process that aims to reduce the chemical reactivity of a surface by removing the free iron from the surface using an acid solution making the metal passive to the external environment, or less reactive.

 

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