SU1678901A1 - Solution vibration-chemical treatment of aluminum alloy-based parts - Google Patents

Abstract

The invention relates to chemical-mechanical treatment of a metal surface. The goal is to reduce roughness, increase surface reflectivity and increase metal removal. The solution for the vibrochemical treatment of parts made of aluminum alloys contains, wt%: sulfuric acid 0.2 - 0.5; carbamide 0.06 - 0.15; polyacrylamide 0.008 - 0.2; sodium alkyl polyoxyethylene sulfate is 0.04-0.1 and water is up to 100, and the ratio of urea, sodium alkylpolyoxyethylene sulfate and polyacrylamide is 1.5: 1: 0.2. The goal is achieved by using sulfuric acid as a mineral acid, urea and polyacrylamide as an organic additive, and polyalkyl polyoxyethylene sulfate as a surfactant, as well as using these components in a 1.5: 1 ratio. : 0.2 2 tab. cl

Description

The invention relates to chemical-chemical machining of parts and is used, in particular, in the vibration treatment of machine parts from silumins.

The aim of the invention is to reduce the roughness, increase the reflectivity of the surface and increase the metal removal rate.

The solution for the vibrochemical treatment of parts made of aluminum alloys contains, wt%:

Sulfuric acid0,2 - 0.5

Polyacrylamide 0.008 - 0.02

Urea0.06-0.15

Natrialkylpolyoxyethyl e N. sulfat0.04-0.1

WaterUnder 100

moreover, the ratio of carbamide, sodium alkyl polyoxyethylene sulfate and polyacrylamide is 1.5; 1: 0.2.

PRI me R 1. To prepare a solution, it is necessary first to dissolve polyacrylamide in hot water while stirring, first holding it in warm water to swell for 3-4 hours, and then add the remaining components in the indicated ratios.

Details from silumin brand AK7 weighing 50 g are subjected to vibration treatment in 2 stages.

At stage 1, vibro-abrasive grinding is carried out in a vibrating machine with a capacity of 3 liters in an environment of abrasive Baikalite granules BZ 15-20. Metal removal is fixed for 1 hour of processing.

h

00

yoo o

ki, the achieved surface roughness and the visual degree of clarification.

After completing the vibroabrasive grinding, the parts are washed by dipping to remove abrasive residues and polished in the same machine in an environment of 05-6 mm steel balls, while the reflectivity of the surface and the degree of clarification are fixed.

The compositions of the tested solutions are presented in table. one; the results of the experiments are in table 2.

Analysis of the experimental data shows that the proposed solution is effective only in the proposed concentration range and with a ratio of urea, sodium alkyl polyoxyethylene sulfate and polyacrylamide 1.5: 1: 0.2.

By reducing the concentration of polyacrylamide (less than 0.2 wt.%) With respect to the sodium alkyl polyoxyethylene sulfate, the structure of the adsorption layer and the strength of soil retention in the solution are disturbed, which leads to a decrease in the quality of processing — a decrease in clarification and brilliance.

With an increase in the concentration of polyacrylamide above the upper limit, the viscosity of the solution increases, which limits the removal of metal during vibroabrasive grinding and impairs gloss and clarification.

With a decrease in the carbamide content, the effectiveness of the solution drops sharply, overestimation of the carbamide content above the upper limit or more than 1.5 times in relation to sodium alkyl polyoxyethylene sulfate does not give an additional effect.

When the concentration of sodium alkyl polyoxyethylene sulfate is below the lower limit or its ratio to polyacrylamide and urea is disturbed, the adsorption decreases, the structure strength decreases, which leads to a decrease in surface quality and a removal rate during vibration grinding, and a decrease in the inhibiting properties of the solution and the absence of polishing.

When the concentration of sodium alkyl polyoxyethylene sulfate is above the upper limit, excessive foaming is observed, which impairs the technological properties of the solution.

Polyacrylamide (- CH2-CH-) P

CCNH2

It is used to increase the adsorbability of the components of the solution, helps to increase the strength of soil retention in the solution, and produces luster.

Urea prevents fading

the surface of the steel balls and parts during processing and after processing. Sodium alkyl polyoxyethylene sulfate CnH2n + lO (C2H40) mS03Na, where n is 10 - 13.

m 3, provides clarification and gloss formation, together with polyacrylamide, improves roughness and prevents sedimentation of contaminants from solution onto the surface.

Sulfuric acid brightens the surface of parts and steel balls, increases the removal of metal and prevents clogging of the abrasive during grinding.

The use of the proposed solution provides high efficiency of both vibroabrasive grinding and vibration polishing in the medium of steel balls, reduces roughness, increases the reflectivity of the treated surface and increases the removal of metal.

Claims (1)

The solution for vibrochemical treatment of aluminum alloy parts, mainly silumin, containing mineral acid, organic additive, surfactant and water, characterized in that, in order to reduce roughness, increase surface reflectivity and increase metal removal, it contains sulfuric acid as a mineral acid, carbamide and polyacrylamide as an organic additive, and sodium alkyl polyoxyethylene as a surfactant Ulfat in the following ratio, wt.%: Sulfuric acid0,2 - 0,5 Urea0.06-0.15 Polyacrylamide 0.008 - 0.2 Sodium alkyl polyoxy ethylene sulfate 0.04 - 0.1 - WaterUp to 100 moreover, the ratio of urea, sodium alkyl polyoxyethylene sulfate and polyacrylamide is 1.5: 1: 0.2. Table 1 table 2