SU1675389A1 - Compound for vibration-abrasive grinding of stainless steels - Google Patents

Abstract

This invention relates to the vibroabrasive grinding of stainless steels. The goal is to intensify the process and increase the reflectivity of the surface. The composition for vibroabrasive grinding of stainless steels, predominantly alloyed with vanadium, contains, wt.% - nitric acid (beats in. 1.4 g / cm3) 1.5-2.0; hydrochloric acid (beats at 1.2 g / cm) 0.5-0.7; oxalic acid 1,2-4,0; potassium fluoride 0.1 0.12; fine silica 1.0 1.2; M- (41-dimethylanilino) -3-methoxy-2-naphthohydroxamic acid 0.2-0 6; sulfonate 0.02-0.06; water the rest. The introduction of N (4-dimethylanilino) -3-methoxy-2-naphthohydroxamopic acid and sulfonate into the composition makes it possible to increase the surface cleanliness class from 6 to 9 during one hour.

Description

This invention relates to the vibroabrasive grinding of stainless steels.

The aim of the invention is to intensify the process and increase the reflectivity of the surface.

For all the examples presented in the table, the vibration treatment is carried out at room temperature in an installation with a U-shaped reservoir with a capacity of 20 liters at an oscillation frequency of 2030 col./min and an amplitude of 1.2-1.5 mm. As an abrasive filler, an A-2 roller grinding wheels are used. Parts from ZH5 steel (12H11V2NMFL) alloyed with vanadium are subjected to vibration treatment. The initial surface roughness of the samples corresponds to 2.25-2.40 microns (sixth

purity class) with an initial reflectivity of 10%.

As can be seen from the table, the efficiency of the treatment process in the proposed composition is increased four times as compared with the known one, with the class of surface cleanliness increasing within 6–9, and the reflectivity increasing fivefold.

After processing in the proposed composition, the surface retains its natural color and does not have corrosion damage, while during treatment in a known surface the surface is covered with a gray matte film and has traces of marks.

The composition is prepared by serially dissolving in water at room temperature and stirring nitric and hydrochloric acids, potassium fluoride,

ABOUT

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oxalic acid, fine silica, N- (4-dimethylanilino) -3-methoxy-2-naphthohydroxamic acid and sulfonate.

Introduced into N- (4-dimethylanilino) -3-methoxy-2-naphthohydroxamic acid, the chemical formula of which is

(CH3) 2 OH

allows you to intensify the process of dissolution of the surface layer of the metal, linking formed during vibrotreatment in an acidic environment vanadium ions in complex products like

N-ON (C1V) 2

ABOUT

Thus, the specified complexing agent (N- (4-dimethylanilino) -3-methoxy-2-naphthohydroxamic acid) in the composition serves as an activator that increases the productivity of the treatment process, as well as the brightness agent, which improves the quality of the surface being treated: reflectivity and the color of the metal.

Introduced into the composition of the surfactant - the proposed sulfonate is a mixture of sodium salts of alkyl sulfonic acids with alkyl residues containing 12-18 carbon atoms, and acts as a wetting agent, washing and emulsifying reagent, which promotes the process of polishing the components of the solution with the metal surface by lowering surface and interfacial tension.

When vibroprocessing samples in compositions with concentrations of chemical components above the upper limit (example 1) or below the lower limit (example 5), surface treatment performance deteriorates.

Thus, the introduction of N- (4-dimethylanilino-3) -3-methoxy-2-naphthohydroxamic acid into the complex, capable of forming strong complex compounds with ions of the metal being treated, makes it possible to increase

the efficiency and quality of processing due to the shift of the redox process towards the formation of reaction products, which increases the effect of the chemical factor, and the introduction of the sulfonate helps to remove the reaction products of steel with the composition from the surface of the metal being treated, prevents the sticking of abrasive particles on the metal during

interaction, prevents their mechanical inclusion due to the impact on the metal surface, which is inevitable when vibrations are applied. This is achieved by the formation of

the surface of the sulfonate adsorption layer, which, in addition to the specified effect, softens the impact of abrasive granules during vibro-processing and thus retains the cutting ability of abrasive grains,

those. improves the mechanical processing factor.

The proposed composition has wider technological capabilities, since it can be used for stainless steels alloyed not only with vanadium, but also with titanium.

Claims (1)

Invention Formula The composition for vibroabrasive grinding stainless steels, predominantly alloyed with vanadium, containing nitric, hydrochloric and oxalic acids, acid potassium fluoride, abrasive particles in the form of fine silica and water, characterized in that, in order to intensify the process and increase the reflectivity of the surface , it additionally contains N- (4 dimethylanilino) -3-methoxy-2-naphtho-hydroxamic acid and sulfonate in the following ratio of components, wt.%: Nitric acid (beats 1.4 g / cm3) 1.5-2.0. Sol Na Acid (beats. 1.2 g / cm3) 0.5-0.7 Oxalic acid 1,2-4,0 Potassium fluoride0,10-0,12. Finely dispersed silica 1.0-1.2 M- (4 dimethylanilino) - -Z-methoxy-2-naphthohydroxamic acid 0.2-0.6 Sulfonate 0.02-0.06 WaterEverything Composition for treatment, wt.% Nitric acid Salt acid Acid oxalic acid Potassium fluoride Silicon dioxide N- (4-dimethylanilino) sy 2- -to tohydroxamic acid sulfonate Water Processing conditions Time, h Quality of processing: Roughness, micron Reflectance,% 1.75 0.6 2.6 0.11 1.1 0.4 0.04 Else one 0.30 50 0.6 0.8 0.06 0.08 Ostal-Ostal one 0.31 50 one 0.43 45 Rest one 1.87 10 Rest of the rest 1.31 10 0.73 10 Rest 0.32 10 stj U1 co oo y 05