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Method for simultaneously measuring Cr, Ni and Ti in stainless steel 1Cr18Ni9Ti

A technology of stainless steel and standard samples, which is applied in the field of aviation materials, can solve the problems of high results when insufficient, low results when excessive, and high test costs, so as to save time and cost, reduce steps, and improve test efficiency.

Inactive Publication Date: 2014-03-19
SHAANXI AIRCRAFT CORPORATION
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Problems solved by technology

However, in the determination of the three elements, chromium adopts the chromic acid colorimetric method, and the amount of EDTA should be strictly controlled. If it is insufficient, the result will be high, and if it is excessive, the result will be low, which is difficult to grasp. It is not as stable as the ammonium persulfate oxidation capacity method; Dimethoxime colorimetric method; Titanium hydrogen peroxide colorimetric method
[0007] The disadvantage of the separate measurement method is that the samples need to be weighed and dissolved for measurement, the steps are cumbersome, the test period is long, and the test cost is high
The disadvantage of the existing continuous rapid analysis method is that the stability of the method used is not as stable as that of the method for separate determination

Method used

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Embodiment Construction

[0039] The present invention is described in further detail below.

[0040] The basic idea of ​​the invention is: after the sample is dissolved in dilute sulfuric acid at low temperature, nitric acid is added dropwise to oxidize, and the sample is moved into a volumetric flask. Then take 50ml in sulfuric acid and phosphoric acid medium, use silver nitrate as catalyst, oxidize chromium to hexavalent with ammonium persulfate, and titrate chromium element with ferrous ammonium sulfate titration solution; take 10ml test solution, add ammonium citrate Complex iron, cobalt and other elements, in the presence of oxidizing agents in alkaline medium, nickel and succinyldioxime form a wine-red complex, which is used to colorimetrically determine nickel elements; take 20ml of the test solution and use ascorbic acid to eliminate ferric iron In 10%-20% hydrochloric acid medium, diantipyrine methane reacts with titanium ions to form a yellow complex, which is used for the colorimetric deter...

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Abstract

The invention belongs to the technical field of aeronautical materials, and particularly relates to a method for simultaneously measuring Cr, Ni and Ti in stainless steel 1Cr18Ni9Ti. The method comprises the steps of measuring the Cr by a hydrochloric acid method, measuring Ni by a high-Cr steel Ni reagent colorimetric method, and measuring Ti by an antipyrine methane colorimetric method. According to the method, the measurement of the Cr, the Ni and the Ti in the stainless steel can be integrated, the samples are weighed and dissolved in a unified way, and then the samples are respectively tested after being separated, so that the original complicated steps are reduced, the time and the cost are saved, and the testing efficiency is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of aviation materials, in particular to a method for joint determination of chromium, nickel and titanium in stainless steel 1Cr18Ni9Ti. Background technique [0002] Among the existing chemical test methods for the composition of stainless steel 1Cr18Ni9Ti, there are separate test methods for chromium, nickel, and titanium. The commonly used analysis methods are: [0003] 1. Determination of chromium content by ammonium persulfate oxidation volumetric method. After the sample was dissolved in sulfuric acid, it was oxidized by adding nitric acid dropwise. In sulfuric acid and phosphoric acid medium, silver nitrate is used as catalyst, chromium is oxidized to hexavalent with ammonium persulfate, and titrated with ferrous ammonium sulfate titration solution. [0004] 2. Determination of nickel content by butyldioxime colorimetric method. After the sample was dissolved in sulfuric acid, it was oxidized by ad...

Claims

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Application Information

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IPC IPC(8): G01N21/79G01N21/31
Inventor 屈伟欧文商鹿鸣张敬彤王培凌毛森鑫
Owner SHAANXI AIRCRAFT CORPORATION
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