Method for detecting content of aluminium and aluminium alloy oxide inclusions

Abstract

The invention discloses a method for detecting the content of aluminium and aluminium alloy oxide inclusions, comprising the following steps: (1) first, cutting a sample material of aluminum sheets, washing the sample material with absolute ethyl alcohol and absolute methanol, and drying; (2) weighing 1+ / - 0.0001 g sample material, putting the sample material in a beaker containing 60-100 ml of methanol, adding 2-5 ml bromine in the beaker to react for 30-60 min at a temperature of 20-50 DEG C; (3) then adding 1-3 ml of bromine to react for 15-50 min at a temperature of 20-50 DEG C, and then adding 1-3 ml of bromine again to react for 15-50 min at a temperature of 20-50 DEG C, then reacting at a temperature of 30-60 DEG C until the sample material dissolves completely; (4) filtering the solution with filter paper, removing the filtrate, cleaning the filter paper with methanol until no bromine remains; (5) putting the filter paper having precipitations in a crucible, ashing from a low temperature, heating up to 600-900 DEG C and keeping warm for 20-60 min and then taking out, cooling, adding 1-3 g of alkali, and fusing at a temperature of 550-800 DEG C, taking out and adding hot water in the beaker, adding hydrochloric acid while shaking the beaker, pouring the liquid of the beaker in a 100 ml volumetric flask, and bringing to volume by water; and (6) respectively taking 10 ml of the solution out from the 100 ml volumetric flask, bringing to volume by water, then comparing by using a standard curve obtained by atomic absorption, and then determining the content of the aluminium and aluminium alloy oxide inclusions.

Description

1. Technical field [0001] The invention belongs to the field of non-ferrous metal content detection, in particular to a detection and analysis method for measuring the content of oxidized inclusions in aluminum and aluminum alloys. 2. Background technology [0002] Traditional chemical analysis methods to detect and analyze the content of oxidized inclusions in aluminum or aluminum alloys are mainly determined by the bromine-methanol method. The method is: at a certain temperature, dissolve the sample in bromine-methanol solution, aluminum and other alloy elements will form bromide and dissolve in methanol, while oxides such as silicon and alumina are insoluble, filter and separate and fully wash Finally, the residue and filter paper are dried together, ashed and weighed, and the amount of silicon and the weight of filter paper are deducted to obtain the content of oxidized inclusions. In fact, even if the best quality crucible is selected, it is difficult to be accurate to...

AI Technical Summary

Problems solved by technology

In fact, even if the best quality crucible is selected, it is difficult to be accurate to one thousandth when the crucible is constant.

Obviously, if it is necessary to detect samples whose content of aluminum and aluminum alloy oxide inclusions is less than one thousandth, the gravimetric method cannot meet the requirements.

It has been reported that the bromine-methanol colorimetric method was used to measure aluminum and aluminum alloy oxide inclusions, but this method is cumbersome, requires a variety of reagents, the analysis cycle is very long, and the color development time is difficult to grasp