NZA-1 to NZA-7: Zinc-Aluminum Foundry Alloys
Certificate of Analysis
First Issued : March 1989
Version: May 1996
Seven zinc-aluminum (ZA) alloys were cast as reference materials for chemical composition by the Noranda Research Centre, Noranda Inc. and donated to the Canadian Certified Reference Materials Project. These were sectioned into discs suitable for use in calibration and quality assurance applications, particularly for emission spectrometry methods.
The trimmed discs are 50 mm diameter by 12 mm thickness (2" x 1/2 "). Concentrations were established for a pre-defined measurement annulus exterior to the 6.4 mm (1/4 inch) radius.
The measurement annulus from a representative fraction of the discs was machined into chips, blended and bottled in 80-gram units to provide reference samples suitable for use in wet-chemical methods.
In a fourteen-laboratory measurement program, recommended values were established for the concentrations of three alloy constituents (aluminum, copper and magnesium) and four impurity constituents (iron, tin, lead and cadmium). The recommended values and their precision estimates at the 95% confidence level are summarized in Table 1.
Homogeneity of the disc samples was assessed from statistical analysis of measurements obtained by point-to-plane spark source emission spectrometry. Significant variance between discs was not detected except for iron in the alloys NZA-5, NZA-6 and NZA-7. For information purposes, statistical tolerance intervals were established to delimit the range of possible iron concentrations in disc samples of these alloys.
CANMET-MMSL has prepared this reference material and statistically evaluated the analytical data of the interlaboratory certification program to the best of its ability. The purchaser, by receipt hereof, releases and indemnifies the CANMET-MMSL from and against all liability and costs arising out of the use of this material and information.
The report "ZINC-ALUMINUM FOUNDRY ALLOYS NZA-1 To NZA-7: REFERENCE MATERIALS FOR CHEMICAL COMPOSITION" describes the preparation, analytical measurement program, and the assessments used to establish recommended values and confirm acceptable homogeneity. It is available on request to:
CCRMP, CANMET-MMSL (NRCan)
555 Booth Street, Ottawa
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