Method for measuring contents of nickel and copper serving as main elements in nickel-copper alloy

Abstract

The invention discloses a method for measuring contents of nickel and copper serving as main elements in a nickel-copper alloy. The method comprises the steps: (1) dissolving a sample by using nitricacid and hydrochloric acid to prepare a sample solution; (2) taking the sample solution, and measuring the content of copper in the sample by using a sodium thiosulfate iodometry; and (3) regulating the sample solution to form a slightly acidic solution, then, masking iron, aluminum and titanium by using a fluoride, masking manganese by using sodium hexametaphosphate, adding excessive EDTA, titrating excessive EDTA by using a copper standard titration solution by taking PAN as an indicator; and carrying out calculation according to the consumption of the copper standard titration solution to obtain the contents of nickel and copper in the sample, and deducting the content of copper to obtain the content of nickel in the sample. By using the method, the operation process of sample dissolution is simple, the main element detection works detected by using two chemical titration methods can be simultaneously finished by dissolving the sample once, and the distribution condition of nickel and copper serving as the main elements of the nickel-copper alloy can be more truly reflected; in addition, the precision and accuracy of analysis and measurement are improved, and the method is highin measurement speed and simple and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of metallurgical material analysis, in particular to a method for determining the contents of nickel and copper, the main elements in nickel-copper alloys. Background technique [0002] Nickel-copper alloy has good room temperature mechanical properties and high temperature strength, high corrosion resistance, good wear resistance, easy processing, non-magnetic, and is a good structural material for manufacturing traveling wave tubes and other electronic tubes. Nickel-copper alloys can also be used in as-cast and heat-treated states. It is suitable for aviation fuel installations and other precision friction parts that require stable operation. The content of nickel and copper, the main elements of nickel-copper alloy, has a great influence on its performance. Therefore, controlling the chemical composition within the required range is the basis for selecting materials, and the accuracy of testing the chemi...

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Problems solved by technology

[0003] Nickel content detection in the prior art mainly is to utilize GBT 21933.1-2008 " the determination dimethylglyoxime gravimetric method of nickel-iron-nickel content " and GBT 30072-2013 " the determination EDTA titration method of nickel-iron-nickel content ", but the above-mentioned method dissolves The sampling method is complicated and the operation requirements are high; more importantly, except for the main element of nickel, the matrix of other elements is different, resulting in a very large difference in the color change and precipitation formation during the whole experiment process, which seriously affects the detection of nickel content in nickel-copper alloy

The detection of copper content in the prior art mainly uses GBT 24585-2009 "Determination of nickel iron phosphorus, manganese, chromium, copper, cobalt and silicon content by inductively coupled plasma atomic emission spectrometry" (copper: 0.01% ~ 0.30%), GBT 24198-2009 "Determination of nickel-iron-nickel, silicon, phosphorus, manganese, cobalt, chromium and copper content by wavelength dispersive X-ray fluorescence spectrometry" (copper: 0.05% to 1.5%), however, in nickel-copper alloy samples The copper content in the above two standards far exceeds the copper content in the above two standards, and is not suitable for the detection of copper content in nickel-copper alloy samples.

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