EN 2101:1991

Aerospace series - Chromic acid anodizing of aluminium and wrought aluminium alloys

This standard specifies the required characteristics for the performance of chromic acid anodizing with or without sealing as well as quality assurance of the coating obtained. It applies to parts in aluminium and wrought aluminium alloys of categroy 1 and 2 (see clause 4) used in aerospace construction when reference is made to this standard.

Luft- und Raumfahrt - Chromsäure-Anodisieren von Aluminium und Aluminium-Knetlegierungen

Diese Norm legt die Anforderungen an das Chromsäureanodisieren mit und ohne Nachverdichten sowie die Qualitätssicherung der erhaltenen Überzüge fest. Sie ist für Teile aus Aluminium und Aluminium-Knetlegierungen der Gruppen 1 und 2 (siehe Abschnitt 4) in der Luft- und Raumfahrt und immer dann anzuwenden, wenn auf diese Norm Bezug genommen wird.

Série aérospatiale - Anodisation chromique de l'aluminium et des alliages d'aluminium corroyés

La présente norme spécifie les caractéristiques requises pour l'exécution de l'anodisation chromique, colmatée ou non colmatée, ainsi que le contrôle de qualité des couches obtenues. Elle s'applique aux pièces en aluminium et alliages d'aluminium corroyés des catégories 1 et 2 (voir article 4), destinées aux constructions aérospatiales et à condition d'être mentionnée sur le document de définition.

Aerospace series - Chromic acid anodizing of aluminium and wrought aluminium alloys

General Information

• Status: Published
• Publication Date: 16-Jul-1991
• Withdrawal Date: 16-Jan-1992
• ICS: 49.040 - Coatings and related processes used in aerospace industry
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 4 - Metallic
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 01-Jun-2017
• Completion Date: 14-Apr-2025
• Ref Project: SIST EN 2101:2001 - Aerospace series - Chromic acid anodizing of aluminium and wrought aluminium alloys

Overview

EN 2101:1991 - Aerospace series: Chromic acid anodizing of aluminium and wrought aluminium alloys specifies the required characteristics for chromic acid anodizing treatments (with or without sealing) and the associated quality assurance of the resulting coating. The standard applies to parts made from aluminium and wrought aluminium alloys of category 1 and 2 (see clause 4 of the standard) when referenced in aerospace construction and procurement. It is published by CEN and mirrored in national editions (e.g., SIST EN 2101).

Key Topics and Technical Requirements

• Scope of treatment: Defines which aluminium and wrought alloys (categories 1 and 2) are covered for chromic acid anodizing in aerospace applications.
• Performance characteristics: Specifies required coating properties to meet aerospace performance expectations (corrosion resistance, adhesion, appearance) rather than prescribing specific bath recipes or process parameters.
• Sealing options: Covers chromic acid anodizing with or without subsequent sealing, and the quality expectations for each option.
• Quality assurance: Establishes inspection and acceptance criteria for coatings, including surface integrity and evidence of conformity to the standard.
• Documentation and traceability: Requires appropriate records and documentation to demonstrate compliance for aerospace parts and supply-chain control.

Note: EN 2101 focuses on performance and QA requirements; actual process control (bath composition, temperatures, times) is implemented by suppliers to meet those performance criteria.

Applications

• Aerospace structural parts: Fasteners, panels, fittings and other components manufactured from aluminium alloys used in airframes and related aerospace assemblies.
• Surface protection: Where chromic acid anodizing is specified to provide corrosion resistance, paint adhesion promotion, or controlled surface finish prior to assembly or coating.
• Supply-chain procurement: Used by prime contractors, OEMs and subcontractors to specify and verify anodic coatings on aluminium components for aerospace certification.

Who uses EN 2101

• Aerospace engineers and materials specialists writing procurement and design specifications.
• Surface-treatment processors and plating shops performing chromic acid anodizing for aerospace customers.
• Quality assurance, inspection and compliance teams within aerospace OEMs and suppliers.
• Procurement and regulatory teams ensuring parts meet recognized aerospace surface-treatment standards.

Related standards

• Complementary EN / ISO standards addressing surface preparation, surface characterization, nondestructive testing and coating performance are typically used alongside EN 2101.
• Users should also consider applicable environmental and occupational health regulations when specifying chromic acid anodizing processes.

Keywords: EN 2101, chromic acid anodizing, aluminium anodizing, aerospace coatings, SIST EN 2101, anodizing standard, quality assurance.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Chromic acid anodizing of aluminium and wrought aluminium alloysLuft- und Raumfahrt - Chromsäure-Anodisieren von Aluminium und Aluminium-KnetlegierungenSérie aérospatiale - Anodisation chromique de l'aluminium et des alliages d'aluminium corroyésAerospace series - Chromic acid anodizing of aluminium and wrought aluminium alloys49.040Prevleke in z njimi povezani postopki, ki se uporabljajo v letalski in vesoljski industrijiCoa
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