SIST EN 3665:2001

Aerospace series - Test methods for paints and varnishes - Filiform corrosion resistance test on aluminium alloys

This standard specifies a test method for the determination of the protective action of coatings of paints or varnishes against filiform corrosion on aluminium alloys.

Luft- und Raumfahrt - Prüfverfahren für Anstrichstoffe - Prüfung der Beständigkeit gegen Filiformkorrosion von Aluminiumlegierungen

Diese Norm legt ein Prüfverfahren zur Bestimmung der Schutzwirkung von Anstrichstoff-Beschichtungen gegen Filiformkorrosion auf Aluminiumlegierungen fest.

Série aérospatiale - Méthodes d'essai pour peintures et vernis - Essai de résistance a la corrosion filiforme sur alliage d'aluminium

La présente norme spécifie une méthode d'essai pour la détermination de l'action protectrice de couches de peintures ou de vernis contre la corrosion f filiforme sur alliages d'aluminium.

Aerospace series - Test methods for paints and varnishes - Filiform corrosion resistance test on aluminium alloys

General Information

• Status: Published
• Publication Date: 31-Dec-2000
• ICS: 49.025.20 - Aluminium
• ICS: 49.040 - Coatings and related processes used in aerospace industry
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2001
• Due Date: 01-Jan-2001
• Completion Date: 01-Jan-2001
• Ref Project: EN 3665:1997 - Aerospace series - Test methods for paints and varnishes - Filiform corrosion resistance test on aluminium alloys

Overview

EN 3665:1997 (CEN) - "Aerospace series - Test methods for paints and varnishes - Filiform corrosion resistance test on aluminium alloys" specifies a standardized test method to determine the protective action of paint and varnish coatings against filiform corrosion on aluminium alloys. The standard is intended for coatings and related processes used in the aerospace industry and provides a repeatable way to evaluate how well a coating resists filamentary corrosion initiated at coating defects or along scribed paths.

Key topics and requirements

The standard focuses on the following technical topics and requirements (as summarized from the scope and title):

• Scope: Measurement of filiform (filamentary) corrosion resistance specifically for coatings applied to aluminium alloys in aerospace applications.
• Specimen preparation: Requirements for substrate selection, surface preparation and coating application to ensure consistent, comparable test samples.
• Test initiation: Controlled initiation of filiform corrosion (e.g., by scribing or creating defects) to assess coating performance under realistic failure modes.
• Exposure conditions: Use of specified environmental or humidity exposure protocols to promote filamentary corrosion propagation in a reproducible way.
• Assessment and evaluation: Criteria and methods for visual inspection, measurement of filament length/density, and ranking or classification of coating protective action.
• Reporting: Standardized test reporting to ensure traceability and comparability between laboratories and suppliers.

Note: EN 3665:1997 defines the test method and evaluation approach rather than prescribing specific coating formulations.

Applications

EN 3665 is practically valuable for professionals involved in aerospace materials and coatings, including:

• Coating manufacturers validating filiform corrosion resistance of new paint and varnish systems for aluminium parts.
• Aerospace OEMs and suppliers performing quality control and acceptance testing of coated aluminium components.
• Materials and corrosion engineers conducting R&D on protective coatings and surface treatments.
• Accredited test laboratories providing certified corrosion testing services for aerospace contracts.
• Procurement and compliance teams demonstrating that coatings meet recognized aerospace test methods.

Using this CEN standard helps reduce in-service corrosion risks, improves durability of aluminium airframe components, and supports claims about coating longevity and protective performance.

Related standards

For comprehensive corrosion control programs, users typically refer to other aerospace and corrosion test standards (surface preparation, salt spray, adhesion tests). When applying EN 3665, coordinate with applicable aerospace specifications and materials standards relevant to aluminium alloys and coating systems.

Keywords: EN 3665:1997, filiform corrosion resistance, aluminium alloys, aerospace coatings, test methods for paints and varnishes, CEN standard.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Test methods for paints and varnishes - Filiform corrosion resistance test on aluminium alloysLuft- und Raumfahrt - Prüfverfahren für Anstrichstoffe - Prüfung der Beständigkeit gegen Filiformkorrosion von AluminiumlegierungenSérie aérospatiale - Méthodes d'essai pour peintures et vernis - Essai de résistance a la corrosion filiforme sur alliage d'aluminiumAerospace series - Test methods for paints and varnishes -
...