Overview
SIST EN ISO 2064:2000, titled Metallic and other inorganic coatings - Definitions and conventions concerning the measurement of thickness (ISO 2064:1996), is an international standard developed by CEN in alignment with ISO Technical Committee 107, Subcommittee SC 2. This standard provides clear definitions, terms, and rules related to measuring the thickness of metallic and other inorganic coatings applied to various substrates. It replaces the earlier EN ISO 2064:1994 and ISO 2064:1980 editions, offering a technically revised and harmonized approach crucial for consistency in coating thickness measurements.
Key Topics
-
Scope and Purpose
The document sets out precise definitions for terms such as minimum local thickness, average thickness, reference area, and local thickness in the context of metallic and inorganic coatings. It ensures that thickness measurements across different test methods yield comparable and reliable results.
-
Definitions
- Significant surface: The coated part essential for functionality or appearance.
- Reference area: A specified area where multiple thickness measurements are aggregated.
- Local thickness: The mean thickness within a reference area.
- Minimum local thickness: The lowest local thickness found on the significant surface.
- Average thickness: Mean thickness over a number of local thickness measurements evenly distributed on the surface.
-
Measurement Techniques
The standard recognizes different methods for thickness measurement:
- Microscopical method (ISO 1463) - allows high-resolution measurement over small fields of view.
- Anodic dissolution (coulometric) method (ISO 2177) - useful for precise mass-loss analysis to infer thickness.
- Non-destructive methods - typically with defined probe areas and less spatial resolution.
-
Determining Local and Average Thickness
Rules for selecting and sizing reference areas and the number of measurements are specified to ensure accuracy, especially for articles with surfaces smaller or larger than 1 cm².
- For small significant surfaces, the entire area may be used as a reference area.
- For larger surfaces, multiple replicate determinations are distributed across the significant surface.
- The measurement results should be reported as mean values within the reference area to provide consistent minimum thickness values.
Applications
SIST EN ISO 2064:2000 applies broadly in industries where metallic and inorganic coatings are critical for protection, appearance, and performance, including:
-
Automotive and Aerospace
Ensures corrosion protection coatings meet minimum thickness standards for durability and safety.
-
Electronics and Electrical Components
Guarantees the conductive coatings have precise thicknesses for functionality and longevity.
-
Construction and Architectural Metals
Confirms that protective coatings comply with specified minimum thickness requirements for environmental resistance.
-
Manufacturing and Quality Control
Provides uniform guidelines for quality assurance testing labs and manufacturers to assess coating thickness accurately using different measurement methods.
By following this standard, organizations can harmonize coating thickness measurements, reducing discrepancies between testing methods and ensuring compliance with product specifications.
Related Standards
- ISO 1463:1982 - Metallic and oxide coatings - Measurement of coating thickness - Microscopical method
- ISO 2177:1985 - Metallic coatings - Measurement of coating thickness - Coulometric method by anodic dissolution
- Other method standards addressing non-destructive thickness measurement techniques
These referenced normative standards complement EN ISO 2064 by providing detailed procedures for specific test methods, enabling users to apply consistent measurement practices across coating inspection processes.
Keywords: metallic coatings standard, coating thickness measurement, inorganic coatings, minimum thickness definition, microscopical method, anodic dissolution, coating quality control, EN ISO 2064, international coating standards, non-destructive coating testing