ISO 7530-1:2015

Overview - ISO 7530-1:2015 (Nickel alloys, FAAS analysis)

ISO 7530-1:2015 specifies flame atomic absorption spectrometric (FAAS) methods for the determination of cobalt, chromium, copper, iron and manganese in nickel alloys that can be dissolved in the specified nitric–hydrochloric acid mixture. For each element the method is applicable in the content range 0.01 % to 4 %. The standard describes sample dissolution, reagent preparation, instrument adjustment, calibration and calculation of results for reliable quantitative analysis.

Key topics and technical requirements

• Scope and applicability: Methods apply only to nickel alloys soluble in the specified nitric–hydrochloric acids mixture; concentration range 0.01–4.00 % for each element.
• Principle (FAAS): Nebulization of dissolved sample into an air/acetylene or nitrous oxide/acetylene flame; measurement of atomic absorption at each element’s resonance line and comparison with calibration standards.
• Reagents and standards: Detailed preparation of nitric and hydrochloric acid solutions, the nitric–hydrochloric mixture (prepared fresh; unstable and liberates chlorine - use in a fume hood), strontium chloride, hydrogen peroxide and element-specific stock and working standard solutions.
• Sample preparation: Dissolution of a test portion in the acid mixture, evaporation of excess acids, oxidation or treatment where required, and dilution to known volume. Procedures for preparing test solutions for each element are given separately.
• Calibration and instrument control: Preparation of calibration solutions for each element, adjustment of spectrometer, creation of calibration curves, blank tests and checks of instrumental criteria (Annex A).
• Quality and expression of results: Instructions on spectrometric measurement, calculation, precision data and required information in the test report.

Practical applications

• Routine chemical analysis of nickel alloys in metallurgy and materials laboratories.
• Quality control for manufacturers of nickel-based components and alloys used in aerospace, power generation, chemical processing and corrosion-resistant applications.
• Certification testing for materials specifications and acceptance of alloy shipments.
• Research and development where accurate trace and minor element quantification (Co, Cr, Cu, Fe, Mn) in nickel matrices is required.

Who should use this standard

• Analytical and metallurgical chemists, QA/QC laboratories, materials testing services, alloy producers, and regulatory or inspection bodies involved in nickel-alloy characterization.

Related standards and references

• ISO 7530 series (other parts cover Al, Si, V - Parts 7, 8, 9).
• Normative references cited in the standard include laboratory glassware standards such as ISO 385, ISO 648, and ISO 1042.