ASTM E1251 PDF

ASTM E1251 PDF

E – 07 Standard Test Method for Analysis of Aluminum and Aluminum Alloys by Atomic Emission Spectrometry, aluminum, aluminum alloys, atomic. Buy ASTM E TEST METHOD FOR ANALYSIS OF ALUMINUM AND ALUMINUM ALLOYS BY SPARK ATOMIC EMISSION. ASTM E Standard Test Method for Analysis of Aluminum and Aluminum Alloys by Spark Atomic Emission Spectrometry Scope

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A few benchmark Certied Reference Materials are available from the National Institute of Standards and Technology5 and many other reference materials are available commercially in both chill-cast and wrought forms. Active view current version of standard. See Appendix X1 for additional information concerning the acquisition of calibration data.

An Angstrom is dened as 0. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own adtm. Other forms may be analyzed, provided that: NOTE 9—For optimum precision and accuracy, the reference materials and specimens shall have been freshly machined no longer than 1 h before use, to avoid the formation of aluminum oxide.

F See footnote E. H Interference Factor, k—The e12551 increase in the concentration of the element being determined, expressed in percent, due to 1. In routine use, whenever a different alloy type has to be analyzed, a type r1251 material will be burned and the computer will apply lateral shifts qstm the standardized curves, appropriate to each element in that alloy. Each matrix is calibrated as in X1. The computer may have calculated a curve that weaves in and out between the points for the calibrants.

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Reject all bad burns.

ASTM E铝和铝合金分析_百度文库

The range shown for each element does not demonstrate the actual usable analytical range for that element. Burn f1251 standardants for the next ve or six calibrants.

Originally published as E — For optimum usefulness, several of the calibrants should have concentrations of the other elements that cover the ranges to be expected in the unknown specimens. They shall be used to NOTE 7—Fortunately with aluminum, there are relatively few interferences because the aluminum spectrum itself and the spectra of the major alloying elements silicon, copper, magnesium, zinc, and tin are simple.

Cylinders of either compressed argon gas or liquid argon may be employed. The computer applies the displacement appropriate to that alloy over the relatively short portion of the overall calibration curve that will be used. Each high-frequency wave train is fully rectied, so that the specimen is always the cathode, and only specimen material is introduced into the analytical gap. It can be applied to other types of specimens if there are appropriate reference materials, or if the specimens are remelted.

I The detection limit for iron is determined more by possible segregation in the specimen and by contamination during machining than by spectrochemical sensitivity. Alternatively, argon gas of the requisite purity can be produced from a welding grade supply by passing it through a titanium furnace which removes oxygen, nitrogen, water, and oil vapors, and other impurities.

Department of Commerce, Gaithersburg, MD The exact composition need not be known, since the standardants shall be used only to adjust the instrument to reproduce the intensity ratios which they produced at the time the analytical curves were established. The concentration ranges given in the above scope were established through cooperative testing ILS of selected reference materials. Two types of standardization are commonly used, as follows 3. The excitation chamber shall be designed so that it can be ushed automatically with argon gas.

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This shall be done initially and as often as necessary thereafter to maintain proper alignment. Accurate, high-speed analysis of aluminum, before it is poured from the furnace, can prevent scrapped heats and minimize the cost of expensive alloying metals.

A bad burn will have shallow pittings, surrounded by a whitish or silvery ring. Accordingly, to correct for drift, it is essential to select prospective standardants and determine their uniformity before starting the calibration process.

ASTM E1251 – 17a

Useful analytical lines with improved signal to background ratios due to the complete removal of C-N background by the argon atmosphere. Preparation of Reference Materials and Specimens Other asrm may be analyzed, provided that 1 they are sufficiently massive to prevent undue heating, 2 they permit machining at surfaces having a minimum diameter of approximately 15 mm, and 3 reference materials of similar metallurgical condition and chemical composition are available.

The ow gage need not be incorporated atsm the system permanently, but may be connected at the outlet temporarily while initiating adjusting the operating ow, and then can be removed. Precise and accurate aztm are essential to obtaining desired properties, meeting customer specifications, and helping to reduce scrap due to off-grade material. With a strip chart or X-Y recorder, concentration scales may be preprinted on the paper, as illustrated in Test Method E Suitable techniques include but are not limited to glow discharge mass spectrometry, XRF, and cold vapor AA.