Passivation and Heat Treatments

Chemical Passivation

It is a chemical process that enhances a metal’s resistance to corrosive agents and can be used as a pre-treatment before starting the galvanic cycle, if required.

This process involves forming a dense and uniform film designed to keep the metal immune from chemical, atmospheric, and corrosive agents over time.

Passivation treatments are carried out by immersing the material in acidic solutions (usually nitric acid HNO3 or citric acid C6H8O7) and can be performed at room temperature or at a maximum temperature of 60°C to eliminate oily or greasy molecules present on small metal parts, in specialized baths or with the help of ultrasonic waves.

Heat Treatment

This process is intended to modify and/or alter the mechanical and technological properties of materials.

Heat Treatment: Processing Stages

Heat treatment involves several stages:

Heating Phase

The part is placed in a dedicated furnace to ensure uniform heating across the entire surface of the material. The heating is done slowly to avoid thermal variations between the internal and external parts of the component. The temperature varies depending on the type of treatment required.

Soaking Phase

This is the most important phase. The soaking phase is when the material is kept at a constant temperature, ensuring that the part inside the furnace reaches the same temperature across all points of its surface. The duration of this phase varies based on the customer’s request.

Cooling Phase

In this final phase of the heat treatment, the part inside the furnace is gradually brought back to room temperature to avoid thermal shock.

Chemical Passivation

Heat Treatment

Heat Treatment: Processing Stages

Heating Phase

Soaking Phase

Cooling Phase

Processing

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