SU699394A1 - Electrolyte for etching low-carbon steel - Google Patents

Description

(54) ELECTROLYTE FOR THE PREPARATION OF LOW-CARBON STEEL

one

The invention relates to the field of metallography and can be used in detecting the grain boundaries of austenite low carbon steel.

An electrolyte is known for etching the initial austenite grain in medium carbon and alloyed steels containing 30 g of aluminum sulphate and. 200 ml of water l. However, the known electrolyte does not allow qualitative detection of the grain boundaries of austenite in mild steel.

The closest to the proposed electrolyte is an electrolyte, 2, which contains,%: Ammonium persulphate, 0.5 Ek) yes Else The purpose of the invention is to improve the detection of austenite grain boundaries. For this, hexyl alcohol is added to the electrolyte containing ammonium persulphate and water;

the following ratio of components, about. %:

Persulphate

ammonium, O, 5-1, O5 Hexyl

alcohol, 02-O, 5 Distilled water The rest,

The introduction of a surfactant substance, such as hexyl alcohol, which accelerates the oxidative process along the grain boundaries, into an aqueous solution of ammonium persulfate makes it possible to quickly and clearly reveal the grain boundaries in low carbon steel.

The choice of the boundary parameters O, 5-1, O5 vol%, ammonium sulfate and 0, O2-0.5 vol%, hexyl alcohol is due to the fact that the content in the reagent is less than 0.5 vol%, ammonium sulfate leads to underdevelopment, and more 1.05% by volume

to overheat the surface of the thin section. When additionally, the shea into the reagent is less than O, O2 vol,% hexyl alcohol, there is underheating, and more than 0.5 vol. % - peretrav surface thin sections.

0.5

0.01

0.02

0.5

0,6 O, O1

0.02

0.5

0.6 0.4

0.5

Electrolytic etching was carried out at a voltage of 12 V, current density of 0.7 A / cm for 30-s.

Claims (2)

As can be seen from the table, when etching in the proposed electrolyte of mild steel, graides of austeptic grains are detected quickly and clearly, while etching in a known electrolyte does not achieve positive results in etching. Claims of the invention Electrolyte for pickling mild steel. Contained nassernokis The table presents solutions with boundary and optimal ratios of 1 × 1 × for testing the proposed electrolyte, as well as some experimental solutions. about 100 start peretrava about the same Nedotrav nedotrav nedotrav Surface is good Surface is good Peretrav Start retrav Surface is good Start retrav Peretrav Surface is good The surface is very good ammonium and water, characterized in that, in order to improve the detection of grain boundaries of austenite, it contains hexyl alcohol in the following ratio of components, vol.%: O, 5-1, O5 O, 02-O, 5 Rest. 56993946 Information sources, 2. Popilov L., J., et al. Efect replicable into account during the examination and etching of metallographic, Factory Laboratory, 1954, knkh shlif, M., Metallurgi, 1964, N98, p. 932. Application, Electrolyte number 464.