SIST EN 3475-508:2007

Aerospace series - Cables, electrical, aircraft use - Test methods - Part 508: Plating thickness

This standard specifies the procedures for measuring the plating thickness and centricity of metallic coatings on single conductors.
It shall be used together with EN 3475-100.

Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 508: Schichtdicke des Uberzugs

Diese Norm legt die Verfahren zum Messen der Schichtdicke und Zentrizität von metallischen Überzügen auf
Einzeldrähten fest.
Sie ist in Verbindung mit EN 3475-100 anzuwenden.

Série aérospatiale - Câbles électriques a usage aéronautique - Méthodes d'essais - Partie 508 : Epaisseur du revetement

Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode - 508. del: Debelina prevleke

General Information

• Status: Published
• Publication Date: 03-Oct-2007
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 21-Sep-2007
• Due Date: 26-Nov-2007
• Completion Date: 04-Oct-2007
• Ref Project: EN 3475-508:2007 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 508: Plating thickness

Relations

• Replaces: SIST EN 3475-508:2004 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 508: Plating thickness
• Effective Date: 01-Nov-2007

Overview

EN 3475-508:2007 specifies accepted test procedures to measure the plating thickness and, where applicable, the centricity (distribution) of metallic coatings on single conductors used in aerospace cable assemblies. The standard is intended for use together with EN 3475-100 and references analytical vocabulary in ISO 6955. In case of dispute, the galvanic removal (coulometric) technique (method 4) is the reference method.

This document supports quality control, material verification and compliance activities for aerospace electrical wiring and harness suppliers, manufacturers and test laboratories.

Key Topics

• Scope and normative references: use EN 3475-508 with EN 3475-100 and ISO 6955.

• Five permitted test methods (one is the reference in dispute):

  • Method 1 - Atomic Absorption Spectrometry (AAS): determines elemental concentration (Ag, Ni, Sn, etc.) by AAS and converts concentration to average plating thickness. Typical flame AAS detection limits from the standard include Ag 0.002 mg/l, Ni 0.01 mg/l, Sn 0.001 mg/l. Centricity cannot be determined by this method.
  • Method 2 - Scanning Electron Microscope (SEM): cross-section imaging enables direct measurement of coating thickness and centricity, with high resolution and optional X‑ray elemental analysis. Detailed metallographic preparation (casting in epoxy, cutting, polishing, etching and gold coating) is required.
  • Method 3 - Optical Microscopy: suitable for coatings > 2 µm. Uses similar metallographic preparation to SEM; thickness and centricity are measured on polished cross-sections.
  • Method 4 - Galvanic Removal (Coulometric): reference method in dispute; removes the coating electrochemically and measures removal time/current to infer average thickness. Centricity cannot be assessed.
  • Method 5 - Chemical Removal (Deplating): uses selective chemical attack to remove the coating, then computes average thickness from weight loss, strand length and diameter. Useful for irregular platings; centricity and local minimum thickness cannot be determined.

• Sample preparation requirements: strands must be free of grease/oxide; for microscopy methods samples are cast in epoxy, ground and polished; method 5 calls for 50 cm specimens and calibrated measurement equipment.

Applications

• Routine quality control of plated single conductors used in aerospace wiring
• Verification of supplier plating claims for nickel, silver, tin and similar coatings
• Failure investigation or materials verification where coating thickness or distribution affects electrical or mechanical performance
• Specification compliance for product standards and technical specifications that require minimum thickness or centricity

Related Standards

• EN 3475-100 - Aerospace series: Cables, electrical, aircraft use - Test methods - Part 100: General (to be used together with EN 3475-508)
• ISO 6955 - Analytical spectroscopic methods - Vocabulary

Note: Minimum plating thickness and any centricity requirements shall be stated in the applicable technical specifications or product standards. Follow equipment manufacturer instructions for instrument-specific setup and calibration.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Cables, electrical, aircraft use - Test methods - Part 508: Plating thicknessSérie aérospatiale - Câbles électriques a usage aéronautique - Méthodes d'essais - Partie 508 : Epaisseur du revetementLuft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 508: Schichtdicke des UberzugsTa slovenski standard je istoveten z:EN 3475-508:2007SIST EN 3475-508:2007en49.060Aerospace electric equipment and systemsICS:SIST EN 3475-508:20041DGRPHãþDSLOVENSKI
STANDARDSIST EN 3475-508:200701-november-2007

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3475-508August 2007ICS 49.060Supersedes EN 3475-508:2002
English VersionAerospace series - Cables, electrical, aircraft use - Testmethods - Part 508: Plating thicknessSérie aérospatiale - Câbles électriques à usageaéronautique - Méthodes d'essais - Partie 508 : Epaisseurdu revêtementLuft- und Raumfahrt - Elektrische Leitungen fürLuftfahrtverwendung - Prüfverfahren - Teil 508:Schichtdicke des UberzugsThis European Standard was approved by CEN on 21 June 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3475-508:2007: E
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