ISO 4193:1981 PDF

Overview

ISO 4193:1981 - Aluminium and Aluminium Alloys – Determination of Chromium Content – Flame Atomic Absorption Spectrometric Method establishes a standardized analytical procedure for determining chromium content in aluminium and aluminium alloy products. Developed by the International Organization for Standardization (ISO), this standard ensures accurate testing for chromium concentrations ranging from 0.003% to 0.6% by mass (with applicability up to 1.5% by mass for certain cases). It offers guidance on essential topics such as principles, required reagents, sampling techniques, apparatus, step-by-step analysis, result calculation, and test reporting. By following ISO 4193:1981, laboratories and manufacturers can achieve consistent quality control and compliance within the aluminium industry.

Key Topics

• Analytical Principle: Describes the use of flame atomic absorption spectrometry (FAAS) for measuring chromium after dissolving the test sample in acids, with detection typically set at a wavelength near 357.9 nm.
• Scope of Applicability: Specifies chromium content determination for a wide range of aluminium products, effective for concentrations from 0.003% up to 0.6% by mass, with potential extension up to 1.5%.
• Reagents and Apparatus: Lists requirements for high-purity reagents, such as hydrochloric, nitric, sulphuric, and hydrofluoric acids, as well as hydrogen peroxide and lanthanum chloride. Also includes necessary laboratory equipment like atomic absorption spectrometers, burners, and precise burettes.
• Sampling and Test Procedure: Details methods for laboratory sampling (preferably using milled or drilled chips not more than 1 mm thick), solution preparation, calibration curve development, spectrometric measurements, and data correction for blank tests.
• Result Calculation and Reporting: Outlines formulas for calculating chromium percentage by mass and essential elements for an ISO-compliant test report, including sample identification and any deviations or unusual observations.

Applications

ISO 4193:1981 plays a crucial role in the aluminium and aluminium alloys industry, supporting:

• Quality assurance and process control by ensuring chromium levels are within required specifications for different alloy compositions.
• Materials research and development, providing reliable analytical data for new aluminium alloy formulations where chromium is a critical element.
• Regulatory compliance with international and regional standards mandating the maximum allowable chromium content in aluminium products.
• Trade and certification of aluminium materials, facilitating mutual recognition of test results between manufacturers, clients, and regulatory bodies.
• Academic and industrial laboratories, offering a benchmark method for routine or reference analysis of chromium in aluminium matrices.

Related Standards

Professionals using ISO 4193:1981 may also benefit from referencing additional international standards relating to chemical analysis and quality control in aluminium metallurgy, such as:

• ISO 2107 - Aluminium and aluminium alloys – Determination of manganese content – Flame atomic absorption spectrometric method
• ISO 15599 - Aluminium and aluminium alloys – Determination of metal content using inductively coupled plasma optical emission spectrometric method
• ISO 8070 - Aluminium and aluminium alloys – Determination of copper content – Atomic absorption spectrometric method
• ISO 5721 - Aluminium and aluminium alloys – Sampling for chemical analysis

By adhering to ISO 4193:1981 and its related standards, laboratories and industry stakeholders can improve analytical precision, product reliability, and global competitiveness in the production and evaluation of aluminium and its alloys.