Significance and Use

The metallurgical properties of magnesium and its alloys are highly dependant on chemical composition. Precise and accurate analyses are essential to obtaining desired properties, meeting customer specifications and helping to reduce scrap due to off-grade material.

This test method is applicable to chill cast specimens as defined in Practice B 953 and can also be applied to other types of samples provided that suitable reference materials are available.

1. Scope

1.1 This test method describes the analysis of magnesium and its alloys by atomic emission spectrometry. The magnesium specimen to be analyzed may be in the form of a chill cast disk, casting, sheet, plate, extrusion or some other wrought form or shape. The elements covered in the scope of this method are listed in the table below.

The concentration ranges given in the above scope are estimates based on two manufacturers observations and data provided by a supplier of atomic emission spectrometers. The range shown for each element does not demonstrate the actual usable analytical range for that element. The usable analytical range may be extended higher or lower based on individual instrument capability, spectral characteristics of the specific element wavelength being used and the availability of appropriate reference materials.

1.2 This test method is suitable primarily for the analysis of chill cast disks as defined in Sampling Practice B 953. Other forms may be analyzed, provided that: (1) they are sufficiently massive to prevent undue heating, (2) they allow machining to provide a clean, flat surface which creates a seal between the specimen and the spark stand, and (3) reference materials of a similar metallurgical condition (spectrochemical response) and chemical composition are available.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific safety and health statements are given in Section 10.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

B953 Practice for Sampling Magnesium and Magnesium Alloys for Spectrochemical Analysis

E135 Terminology Relating to Analytical Chemistry for Metals, Ores, and Related Materials

E158 Practice for Fundamental Calculations to Convert Intensities into Concentrations in Optical Emission Spectrochemical Analysis

E172 Practice for Describing and Specifying the Excitation Source in Emission Spectrochemical Analysis

E305 Practice for Establishing and Controlling Atomic Emission Spectrochemical Analytical Curves

E406 Practice for Using Controlled Atmospheres in Spectrochemical Analysis

E826 Practice for Testing Homogeneity of a Metal Lot or Batch in Solid Form by Spark Atomic Emission Spectrometry

E876 Practice for Use of Statistics in the Evaluation of Spectrometric Data

E1257 Guide for Evaluating Grinding Materials Used for Surface Preparation in Spectrochemical Analysis

E1329 Practice for Verification and Use of Control Charts in Spectrochemical Analysis

E1507 Guide for Describing and Specifying the Spectrometer of an Optical Emission Direct-Reading Instrument

Keywords

atomic emission spectrometry; magnesium; magnesium alloys; optical emission spectrometry;

ICS Code

ICS Number Code 77.040.30 (Chemical analysis of metals); 77.120.20 (Magnesium and magnesium alloys)

DOI: 10.1520/B0954-07

ASTM International is a member of CrossRef.

ASTM B954