This test method outlines the analysis of aluminum and its alloys using spark-atomic emission spectrometry (Spark-AES). The aluminum specimen analyzed may take various forms, including chill-cast disks, castings, foils, sheets, plates, extrusions, or other wrought forms or shapes. The metallurgical properties of aluminum and its alloys are greatly influenced by chemical composition, making precise and accurate analyses crucial for achieving desired properties, meeting customer specifications, and minimizing scrap due to off-grade material. This method is specifically applicable to chill-cast specimens but can also be adapted for other sample types.
ASTM E1251 Test Method
| Qualitative Analysis | In ASTM E1251, specimens are subjected to controlled burning conditions, followed by qualitative analysis. The discharge energy is sufficiently high to ablate material from the sample’s surface, disrupt chemical or physical bonds, and induce atoms or ions to emit radiant radiation. |
| Averaging the Results | Unless a burn produces a highly abnormal internal standard count or exhibits severe visual defects, the results from all burns are averaged. If a burn is rejected, it must be replaced to maintain the same average number of burns. |
