SU1057800A1 - Reagent for revealing alluminium alloy macro structure - Google Patents

Abstract

REACTIVE FOR DETERMINING THE MACHINE STRUCTURE OF ALUMINUM ALLOYS, containing nitric, hydrochloric acid, copper nitrate and water, characterized in that, for the purpose of simultaneous etching of riftra-ypbij, it additionally contains hydrofluoric acid at the following corresponding and KOI ingredient , kitty Acid acid (1.5-1.6 g / cm) 4.0-4.2 Sol hydrochloric acid (1.15-1.20 g / cm) 2.8-3.0 Plavic acid (V O, 96, -: O, 98 g / cm) 1.8-2.0 Nitrate medio, 1-OD5 g Water 1OO-IO

Description

cl

(X) The seizure of flame retardancy to the metallography of aluminum alloys, in particular, reagents for the detection of the macrostructure of low alloyed aluminum alloys of the type Avial. To reveal the macrostructure of aluminum alloys, the reagent U is known (|: obese: Caustic soda 11 g Water 1OO ml. However, the known reagent is not sufficiently accurate for aluminum avia-type aluminum alloys. The closest to the proposed technical essence and the achieved effect is VAMI 2 reagent containing: 22 O ml Nitric acid 40 O ml Sol per cathode acid copper (chips) 50 g Water 300 ml The preparation of the reagent is carried out in the following sequence: copper chips are placed in a porcelain cup in a non-porous 5 { and nitric acid is poured in. After the copper solution is completely dissolved, hydrochloric acid is added in small portions to the solution, water is added at the very last while being constantly mixed with nitric acid (250 g / l) and hydrofluoric acid (50 g / l) and then wash the sample in water using a brush for 4-6 minutes To qualitatively extract the macrostructure from lavas of the type Avial, the etching process must be repeated 3 times with washing, and the total detection time of micro-C ,. The structure of the sample is 20–25 min. The purpose of the invention is to reduce the etching time during the qualitative detection of the macrostructure of aluminum alloys. To achieve this goal, a reagent containing nitrogen, hydrochloric acid, HSfrpaT copper and water was additionally introduced with hydrofluoric acid in the following ratio of components, ml: Nitric acid y. 1.5-1.6 g / cm) 4.0-4.2 Solic acid (Y 1.15-1.20 g / cm) 2.8-3.0 Hydrofluoric acid {X 0.96-0 , 98 g / cm) 1.8-2, O Copper nitrate 0.1-0D 5 Water100-110 An increase in the reagent concentration of hydrochloric acid leads to darkening of the surface: thin section, and nitric acid to clarification of thin section and odd detection of the macrostructure of the alloy. Increasing the concentration of hydrofluoric acid leads to the dissolution of the surface of thin section. The introduction of copper nitrate in geaKtiVa improves the clarity and contrast of grain boundaries. An increase in the content of copper nitrate leads to the precipitation of thin sediment of amorphous copper on the surface of the thin section. To test the proposed reagent, composites are applied with the content of components in the upper, middle and lower limits, the composition of which is given in Table. 1, Results were obtained in the macrostructure of the luminescent alloy containing%: Alzomishy O, 48; copper 0.48; silicon, 96} magnesium 0,2O; chromium 0.12; iron, using tested compositions proposed in comparison with the known reagent are given in table. 2. The etching conditions for the tested reagent formulations are as follows. The solution is heated to 40-5 O s, the surfaces are prepared: thin sections of the alloy with roughness Rg 1.00 - O, 80 μm (76) and etched in a heated reagent 2O30 seconds. After that, the clips are washed in cold water, clarified in 25% nitric acid solution at room temperature, washed again in cold water and dried in a stream of warm air. As in the case of the application of the proposed composition of the reagent for the detection of the macrostructure of alzominic cnnav WWII with the ratio of the components of the composition that is provided, it provides the necessary quality u; 1f1 of the macrostructure with a significant reduction in the time of their composition.

T ablitse

Composition Content of the reagent

Nitrogen

Hydrochloric acid acid

4.0

2.8

4.1

2.9

4.2

3.0

Nitrate

Water

copper,

g

1.8

0.1

10A

1.9

Oh 12

105

2.0

0,15NO components in the reagent, ml

Claims (1)

DPA REAGENT FOR IDENTIFICATION OF ALUMINUM MACROSTRUCTURE ALLOYS containing nitric, hydrochloric acid, copper nitrate and water, characterized by a tai: that, in order to reduce the etching time with the qualitative identification of the macrostructure, it additionally contains hydrofluoric acid in the following ratio of components, ml: Azbitic acid (Y · = 1.5-1.6 g / cm ¹ ) 4.0-4.2 Hydrochloric acid (y »1.15-1.20 g / cm ¹ ) 2.8-3.0 Hydrofluoric acid (Y = 0.96,;; 0.98 g / cm ¹ ) 1.8-2.0 Copper nitrate 0.1-0.15 τ ' _β Water 100-110 S SLT ,,,, 1057800 4 1057800