DIN 65079

DIN 65079 is a German standard that specifies the requirements for hard chromium plating on aluminum and aluminum alloys. The standard outlines the process, quality, and testing criteria for applying hard chromium coatings to aluminum substrates.

Key Aspects of DIN 65079:

Scope:

• The standard covers the technical requirements for hard chromium plating on aluminum and its alloys, focusing on achieving a high-quality, durable coating.

Application Areas:

• Hard chromium plating is typically used to improve wear resistance, reduce friction, enhance corrosion resistance, and increase the hardness of aluminum components.

Coating Requirements:

• Thickness: The standard specifies the required thickness of the chromium layer, depending on the intended application of the coated component.
• Adhesion: It sets criteria for the adhesion of the chromium layer to the aluminum substrate, ensuring the coating remains intact under stress.
• Surface Finish: Requirements for the surface finish of the coated part, including roughness and appearance, are also provided.

Substrate Preparation:

• The standard details the necessary steps for preparing the aluminum substrate before plating, such as cleaning, degreasing, and activating the surface to ensure good adhesion of the chromium layer.

Plating Process:

• Electrolyte Composition: Specifies the composition of the electrolyte used for hard chromium plating.
• Operating Conditions: Guidelines for the plating process, including temperature, current density, and plating time, are provided to achieve consistent results.

Testing and Quality Control:

• Hardness Testing: The standard defines methods for measuring the hardness of the chromium layer to ensure it meets the specified requirements.
• Thickness Measurement: It provides methods for accurately measuring the thickness of the chromium coating.
• Adhesion Testing: Procedures for testing the adhesion of the coating to the substrate, such as bend tests or thermal cycling, are specified.
• Corrosion Resistance: The standard may also include testing methods for evaluating the corrosion resistance of the plated component.

Marking and Documentation:

• Requirements for marking the coated parts and the necessary documentation to ensure traceability and compliance with the standard are included.

DIN 65079 is important in industries where high-performance aluminum components are required to have enhanced surface properties through hard chromium plating. It ensures that the coatings are applied consistently and meet the rigorous demands of various engineering applications.