SIST EN 14936-1:2006

Overview

SIST EN 14936-1:2006 is a European Standard published by CEN that specifies a titrimetric method for determining aluminium content in copper and copper alloys. This standard applies to unwrought, wrought, and cast products containing aluminium mass fractions between 0.5% and 12%. The method involves a chelatometric titration process with voltametric indication, ensuring precise and reproducible aluminium quantification within copper-based materials.

Developed by the Technical Committee CEN/TC 133 on Copper and Copper Alloys, this standard aims to provide a reliable analytical procedure adaptable to various alloy types, including those with the presence of titanium and zirconium. It is harmonized for use across European countries to maintain consistency in aluminium content measurements.

Key Topics

• Scope and Applicability: Suitable for copper and copper alloys in different physical forms, specifically unwrought, wrought, and cast alloys.
• Sample Preparation: Sampling follows ISO 1811-1 and ISO 1811-2 standards, focusing on fine drillings, chips, or millings with a maximum thickness of 0.5 mm.
• Chemical Reagents: Utilizes analytical grade reagents such as hexamethylenetetramine, chloroform, perchloric acid, nitric acid, hydrochloric acid, and EDTA, alongside specific solutions prepared for manganese, copper, cupferron, and sodium fluoride.
• Analytical Principle: Determination of aluminium via titration at pH ~6, after sodium fluoride demasking to liberate aluminium ions, monitored by voltametric endpoint detection using a polarised double platinum electrode.
• Procedure Variants: Different preparation and titration protocols depending on:
  • Aluminium content range (0.5%–4.0% or 4.0%–12%)
  • Presence or absence of titanium and zirconium in the alloy.
• Result Calculation: Aluminium content is calculated based on volume differences in titrant used before and after sodium fluoride demasking, expressed in percent mass fraction.
• Precision and Validation: Tested across seven laboratories confirming repeatability and reproducibility consistent with ISO 5725 standards for measurement accuracy.

Applications

• Quality Control: Ensures accurate aluminium content analysis in copper alloys for manufacturers and metallurgical laboratories, critical for maintaining alloy specifications.
• Materials Testing: Supports compliance testing in production and research environments to verify aluminium levels in various copper-based materials.
• Industry Standards Compliance: Assists industries such as electrical, plumbing, and automotive sectors in verifying material composition according to EU regulations and international norms.
• Metallurgical Analysis: Enables precise differentiation of alloy compositions necessary for understanding material properties and performance characteristics.

By adhering to SIST EN 14936-1:2006, laboratories can achieve reliable aluminium content determination using a standardized titrimetric method, enabling harmonization of test results across European industries.

Related Standards

• EN 14936-2: Copper and copper alloys - Determination of aluminium content - Part 2: FAAS method, an alternative atomic absorption spectrometry technique.
• ISO 1811-1 and ISO 1811-2: Guidelines for sampling various forms of copper and copper alloys for chemical analysis.
• ISO 3110: Copper alloys - Determination of aluminium as an alloying element using a volumetric method.
• ISO 5725 Series: Standards defining accuracy, repeatability, and reproducibility of measurement methods relevant for validating analytical test procedures.

Following SIST EN 14936-1:2006 helps ensure compliance with European and international standards, enabling consistent aluminium content determination critical for alloy certification and quality assurance.