Method for measuring trace element content in aluminium alloy by ICP method

Abstract

The invention discloses a method for measuring trace element content in aluminium alloy by an ICP method. A mixture of concentrated hydrochloric acid, concentrated nitric acid and water with a proportion of 1:1:2 is employed for dissolving samples. In the method, an aluminium alloy sample containing higher element silicon content can be entirely dissolved; the contents of a plurality of elements dissolved in the same solution are measured simultaneously and separately in one determination; and the analysis efficiency is high. The matrix is matched and matrix effect is reduced. An aluminium alloy national standard sample is measured and the measurement result meets the requirements; the analysis result is accurate and reliable. The dissolution method is simple and rapid; the method needs little reagent and saves test cost. The correction curve has a wide linear range, can meet test requirements of samples with contents from low to high. In the method, the contents of a plurality of elements are determined simultaneously in one solution; the analysis efficiency is high; and the analysis result is accurate and reliable.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, in particular to an ICP method for determining the content of trace elements in aluminum alloys. Background technique [0002] Aluminum alloy materials are widely used in industry, and the content of trace elements has a significant impact on its performance. For example, manganese and magnesium can improve the corrosion resistance and welding performance of aluminum alloys; improper addition of iron and silicon can cause cracks and cause brittleness; chromium can improve alloy toughness and reduce stress corrosion cracking susceptibility, etc. At present, wet chemical analysis is mostly used for the detection of various elements, which is cumbersome to operate and has a long detection cycle, and most of them are aimed at the detection of single elements. Inductively coupled plasma emission (ICP) spectroscopy has the characteristics of high analysis precision, fast analysis speed,...

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Problems solved by technology

Patent CN102331418A discloses a method for measuring the content of elements in aluminum alloys. The method uses sodium hydroxide to dissolve aluminum alloys, then adds dilute nitric acid solution, heats and boils, then cools, and transfers to a 50ml volumetric flask. According to the established standard curve to determine the content of the sample solution; however, when this method is tested by ICP, a large amount of sodium element will be introduced, and the salt content will increase, which will cause high matrix and high background during the detection process, and the detection limit will be reduced. At the same time, the atomization efficiency will be reduced, and the sample unit time Disadvantages such as reduced lift

"Simultaneous Determination of Cobalt and Nickel in Aluminum Alloys by Inductively Coupled Plasma-Atomic Emission Spectrometry" (Wu Tao, Wang Ping, Spectroscopy Laboratory, 27, 2010: 2405-2408) uses concentrated hydrochloric acid and hydrogen peroxide to dissolve the sample, and after cooling to room temperature , the solution is transferred to a 50ml volumetric flask, and the content of the sample solution is determined according to the established standard curve; the disadvantage of this method is that it is difficult to completely dissolve the sample with a high silicon content by this method, and there are few types of elements that can be measured at one time. Low

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