SU876773A1 - Composition for electrolyzed boronizing of steel articles - Google Patents

Description

(54) COMPOSITION FOR ELECTROLYSIS BORING OF STEEL The invention relates to chemical-thermal treatment, in particular to single-phase boronization of steels, and allows to obtain diffusion layers consisting of only one phase. The composition for boring can be used in machine-building metallurgical, instrument-making and other industries of the industry to improve the WEAR, heat and acid resistance of the working surfaces of tools, machine parts and tooling, working under conditions of abrasion, as without shock loads, and when available. A composition for liquid non-electrolytic boronization is known, which provides for the preparation of single-phase (F eg B) layers, containing, in May.%: I, sodium traborate 65 Silicon carbide. 35 The process of diffusion saturation is carried out at 950 ° С | .l. However, the known composition is characterized by a low saturating capacity, which is associated with the use of an electrolytic liquid-free saturation method (the thickness of the armco-heles layer is P-40 µm) with a duration of 2 hours; low

 EFFICIENCY of manufacturability, which consists in high laboriousness of cleaning the hardened surface of parts from adhered melt, as well as low fluidity at saturation temperature. The closest to the present invention is a boron composition containing, in wt%: fluoride 3-1e; manganese oxide 5-15; rub the tetraborate else. The saturation process is carried out by the electrolysis method at a cathode current density of 0.08-0.3 A / cmHV, in particular, when Armco is saturated. iron for 2 h at 900s a single phase (Fe2B) boride layer 95-110 µm thick is formed 1.2. The disadvantages of the known composition include the aggressiveness of the composition used for the material of the metal crucible, as well as the relatively high cost. The purpose of the invention is to reduce the aggressiveness of the composition and its cost. The goal is achieved by the fact that the composition for boronation, including manganese-containing substance, tetraborate and sodium fluoride, is used as a manganese-containing substance silicomanganese in the following ratio of components, wt.%: Silicone-manganese 6-8 Sodium fluoride 3-5

Sodium tetraborate 87-91 Silica manganese is used in the form of a powder with a particle size of 0.5-3, O mm. Diffusion saturation is carried out by immersing the processed products in the melt, which are included in the DC circuit as a cathode. The cathode current density is 0.050.2 A / cm.

Silica-manganese particles settle to the bottom of the bath, in contact with the material of the crucibles. As a result of the electrochemical difference between silicomanganese and the material of the crucible, short-circuited microgalvanic elements like silicomanganese (melted salts) and the material of the crucible begin to work.

The operation of the short-circuited myagalvanic elements is associated with the anodic and cathodic stages of the interaction process. The cathode stage proceeds on the surface of the crucible material, providing cathodic protection to the surface and, in some cases, the formation of diffusion Huk layers. All this protects the crucible material from dissolving. The anodic stage is accompanied by the transition of manganese and silicon from the surface of silicomanganese particles into the melt in the form of ions. Silicon and manganese ions participate in the formation of the boride layer on the hardened part, ensuring the formation of a single-phase structure (Fe2B) or (Fe, Mn2) V. The resulting boride layers are characterized by the absence of cracks and fragments, good adhesion with the substrate material, have high wear resistance and hardness.

Example. Technical processing of Armco iron in the proposed composition is carried out. The boron saturation is carried out at for 2 hours.

Comparative characteristics are given in the table.

The proposed composition of silica manganese sodium fluoride 3 sodium tetraborate -91

Silikomanganese7

sodium fluoride 4

Tetraborate sodium 89

Silikomanganese8

Sodium fluoride 5

Sodium tetraborate 87 mild composition

Manganese oxide 7

100-105 sodium fluoride 4 sodium tetraborate 39

Claims (1)

Composition for electrolytic boring of steel products, comprising 1084 0,0020 1080 0,0010 1077 0,000 0.115 1170 manganese-containing substance, sodium tetraborate, sodium fluoride, o tl and 65 by the fact that, in order to 5 reduce the aggressiveness of the composition and reduce its cost, silico-manganese is used as a manganese-containing substance in the following ratio, wt.%: Silicone manganese 6-8 Sodium fluoride . 3-5 Sodium tetraborate 87-91 876773 6 Sources of information taken into account in the examination b. Thermophysics in foundry. Minsk, 1967, p. 76. 2. USSR author's certificate 581817, cl. C 23 C 9/10, 1975.