The structure for receiving anti-friction coatings on the surface of steel products

 

(57) Abstract:

The invention can be used in machine-building and Metalworking industry to improve the service life of the friction pairs. The inventive composition to obtain a lubricating coating on the steel surface contains, wt%: tetrafluoroborate copper 0,3 - 0,7; glycerin 1.0 to 4.0; trehzameshchenny sodium citrate 0.1 to 1.0; Dubrovskiy potassium 0,05 - 0,1; phosphoric acid 0.1 to 0.1, and water the rest. table 1.

The invention relates to the application of anti-friction coatings by rubbing, in particular to compositions for coating in the form of a thin film of copper on the surface of the friction in the machine-building, Metalworking and other industries.

Known composition contains glycerin, hydrochloric acid, water, Trilon B (disodium salt of ethylenediaminetetraacetic acid). All components are taken in the ratio of the weight.

Trilon B 50 30

Hydrochloric acid (35% solution) 5 7

Water 5 20

Glycerin Rest (1)

This composition allows to obtain a copper protective coating on the treated parts, because it is a preparatory composition for further processing.

The closest technical sumaway organic acid (50 to 100 g/l) (trichloroacetic or lemon) and water (rest) (2).

The lack of structure of the prototype are insufficient anti-corrosion properties due to the lack of anti-corrosion additives. The disadvantage is the greater deposition rate of the copper coating.

The purpose of this part is to improve the quality of the copper coating through the use of tetrafluoroborate copper active reductant copper from solution. The aim is also improved anti-friction properties of the coating.

This objective is achieved in that the composition for the final anti-friction, non-abrasive processing includes the following components, wt.

Glycerin 1,0 4,0

Tetrafluoroborate copper 0,3 0,7

Trehzameshchenny sodium citrate 0,1 1,0

Dubrovskiy potassium 0,05 0,1

Phosphoric acid 0,1 0,2

Water the Rest

The proposed formulations with different ratios of components were prepared as follows. A measured amount of each component in accordance with the specific composition was dissolved at room temperature in normal service water.

In the process of mechanical friction (friction processing) of the treated surface with a small unit loads due to the recovery of stereoselectivity copper is an active reducing agent copper from the solution on the metal surface.

To increase the solubility of tetrafluoroborate copper in the solution is introduced trehzameshchenny sodium citrate, which simultaneously reduces the intensity of wear of parts. To activate or slow down is due to the introduction of dvuhromovokislyj potassium, being corrosion-resistant component. Surface-active agent is glycerol, a product of chemical reactions in the zone of friction processing when receiving metalloproteases coating reduces the coefficient of friction. Added component is orthophosphoric acid accelerates the formation metalloprotease film on high-alloy steels, also increases corrosion properties serwowany film. The following are specific examples of the implementation of the proposal.

Example 1.

Prepared a composition with the following composition, wt. glycerin 1.0, tetrafluoroborate copper of 0.5, trehzameshchenny sodium citrate and 0.6, Dubrovskiy potassium 0,07, phosphoric acid and 0.15, water the rest. After complete dissolution of the resulting composition is applied on a steel-fat cylindrical surface friction on the felt at sliding velocity of 5 m/s, and specific pressure ih divorces, the film thickness of 0.5 μm (see table).

Example 2.

Prepared a composition with the following composition, wt. glycerin 4,0, tetrafluoroborate copper of 0.5, trehzameshchenny sodium citrate and 0.6, Dubrovskiy potassium 0,07, phosphoric acid and 0.15, water the rest. After complete dissolution of the resulting composition is applied on a steel-fat surface friction on the felt when the sliding speed of 5 m/s and a specific pressure of 1.5 MPa for 40 sec.

The coating obtained from the composition, smooth, Golden color, without the oxide stains, film thickness 0.5 µm.

Example 3.

Prepared a composition with the following composition, wt. glycerin 2,5, tetrafluoroborate copper of 0.5, trehzameshchenny sodium citrate and 0.6, Dubrovskiy potassium 0,07, phosphoric acid and 0.15, water the rest.

After complete dissolution of the resulting composition is applied on a steel-fat cylindrical surface friction on the felt when the sliding speed of 5 m/s and a specific pressure of 1.5 MPA for 50 sec.

The coating obtained from this solution, smooth, Golden color, without the oxide stains, film thickness 0.5 µm.

When the concentration of glycerol in the composition of especial further reduce the coefficient of friction and time running and leads to over-consumption component.

Thus, the range of concentration of 1.0 to 4.0 wt. glycerin is optimal for the given part.

Example 4.

Prepared a composition with the following composition, wt. tetrafluoroborate copper 0,3, glycerin 2,5, trehzameshchenny sodium citrate and 0.6, Dubrovskiy potassium 0,07, phosphoric acid and 0.15, water - the rest.

After complete dissolution of the resulting composition is applied on a steel cylindrical surface friction on the felt when the sliding speed of 5 m/s and a specific pressure of 1.5 MPa for 50 sec.

The coating obtained from this solution, smooth, Golden color, without the oxide divorces, the film thickness of 0.6 μm.

Example 5.

Prepared a composition with the following composition, wt. tetrafluoroborate copper 0,7, glycerin 2,5, trehzameshchenny sodium citrate and 0.6, Dubrovskiy potassium 0,07, phosphoric acid and 0.15, water the rest.

After complete dissolution of the resulting composition is applied on a steel-fat cylindrical surface friction on the felt when the sliding speed of 5 m/s and a specific pressure of 1.5 MPa for 35 seconds.

The coating obtained from the composition, even without the oxide divorces, gold is aceveda technological application time of the film, that is impractical, and the concentration of more than 0.7 wt. promotes spontaneous precipitation of copper, which is unacceptable for tribological properties metalloprotease film.

Thus, the range of concentration from 0.3oC 0.7 wt. tetrafluoroborate copper is optimal for the given part.

Example 6.

Prepared a composition with the following composition, wt. glycerin 2,5, tetrafluoroborate copper of 0.5, trehzameshchenny sodium citrate 0,1, Dubrovskiy potassium 0,07, phosphoric acid, 1,15, water the rest.

After complete dissolution of the resulting composition is applied on a steel-fat cylindrical surface friction on the felt when the sliding speed of 5 m/s and a specific pressure of 1.5 MPa for 55 seconds.

The coating obtained from the composition, even without the oxide divorces, Golden color, film thickness 0.5 µm.

Example 7.

Prepared a composition with the following composition, wt. trehzameshchenny sodium citrate 1.0, glycerol and 2.5, tetrafluoroborate copper of 0.5, Dubrovskiy potassium 0,07, phosphoric acid and 0.15.

After complete dissolution of the resulting composition is applied on a steel-fat Qili the EC.

When the content in the composition translesanas sodium citrate is less than 0.1 wt. his actions do not increase the solubility of the salt of copper, and the film is poorly resists wear, by increasing the concentration of this component is more than 1.0 wt. the solubility of salts of copper remains at the same level and there is a significant increase in the coefficient of friction.

Thus the interval of concentration of 0.1 to 1.0 wt. translesanas sodium citrate is optimal for the given part.

Example 8.

Prepared a composition with the following composition, wt. Dubrovskiy potassium 0,05, glycerin 2,5, tetrafluoroborate copper of 0.5, trehzameshchenny sodium citrate and 0.6, phosphoric acid and 0.15, water the rest.

After complete dissolution of the obtained composition was applied in the area of frictional contact on the steel fat cylindrical surface friction on the felt when the sliding speed of 5 m/s and a specific pressure of 1.5 MPa for 30 sec, was magisteriate floor.

The coating obtained from the composition, even without the oxide divorces, Golden color, film thickness 0.5 µm.

Example 9.

Prepared a composition of the following components, mesostoma acid of 0.15, water the rest.

After complete dissolution of the obtained composition was applied in the area of frictional contact on the steel fat cylindrical surface and friction on the felt when the sliding speed of 5 m/s and a specific pressure of 1.5 MPa for 55 sec was magisteriate floor.

The coating obtained from this composition, even without the oxide divorces, Golden color, film thickness 0.5 µm.

The use of compounds with the contents dvuhromovokislyj potassium less than 0.05 wt. impractical because its regulatory and corrosion-resistant properties ineffective, and at concentrations of more than 0.1 wt. dramatically increases processing time of application metalloprotease film.

Thus, the range of concentration from 0.05 to 0.1 wt. dvuhromovokislyj potassium is optimal for the given part.

Example 10.

Prepared a composition of the following components, wt. phosphoric acid of 0.1, glycerin 2,5, tetrafluoroborate copper of 0.5, trehzameshchenny sodium citrate and 0.6, Dubrovskiy potassium 0,07, water the rest.

After complete dissolution of the obtained composition was applied in the area of frictional contact on the steel fat cylindrical PoC magisteriate floor.

The coating obtained from this composition, even without the oxide divorces, Golden color, film thickness 0.5 µm.

Example 11.

Preparing a composition of the following components, wt. phosphoric acid 0,2, glycerin 2,5, tetrafluoroborate copper of 0.5, trehzameshchenny sodium citrate and 0.6, Dubrovskiy potassium 0,07, water the rest.

After complete dissolution of the obtained composition was applied in the area of frictional contact on the steel fat cylindrical surface and friction on the felt at sliding velocity of 5 m/sec, the specific pressure of 1.5 MPa for 30 sec was magisteriate floor.

The coating obtained from this composition, even without the oxide divorces, Golden color, film thickness 0.5 µm.

The use of compositions with a content of phosphoric acid is less than 0.1 wt. ineffective, because its regulatory properties do not appear, and the concentration of more than 0.2 wt. causes sudden loss of copper, which is unacceptable from a tribological point of view.

Thus, the range of concentration of 0.1 to 0.2 wt. orthophosphoric acid is optimal for the given part.

Example 12.

Prepared a composition of the following components is also in the area of frictional contact on the steel fat cylindrical surface and the friction on the felt when the sliding speed of 5 m/s and a specific pressure of 1.5 MPa is observed spontaneous precipitation of copper, the floor of a dark brown colour, which indicates the presence of copper oxide, the film is erased, which is unacceptable from a tribological point of view.

Example 13.

Prepared a composition of the following components, wt. tetrafluoroborate copper of 0.5, trehzameshchenny sodium citrate, 0.5 to water the rest.

After dilution and mixing of sediment components not obtained solution was applied in the area of frictional contact on the steel fat cylindrical surface and the friction on the felt at sliding velocity of 5 m/sec, the specific pressure of 1.5 MPa is observed spontaneous deposition of copper, the coating is dark brown with oxide stains, the film is erased, which is unacceptable from a tribological point of view.

Example 14.

Prepared a composition of the following components, wt. glycerin 2,5, tetrafluoroborate copper of 0.5, trehzameshchenny sodium citrate, 0.5 to water the rest.

After dissolving the precipitate no, the obtained composition was applied in the area of frictional contact on the steel fat cylindrical surface and the friction on the felt at sliding velocity of 5 m/sec, the specific pressure of 1.5 MPa is observed accelerated loss of copper and the formation of copper plait is acceptable from a tribological point of view.

The structure for receiving anti-friction coatings on the surface of steel products, including salt, copper, glycerine, nitratsoderzhaschie connection and water, characterized in that it further comprises Dubrovskiy potassium and phosphoric acid, as a salt of copper and nitratsoderzhaschie connections respectively tetrafluoroborate copper and trehzameshchenny sodium citrate in the following ratio, wt.

Tetrafluoroborate copper 0,3 0,7

Glycerin 1,0 4,0

Trehzameshchenny sodium citrate 0,1 1,0

Dubrovskiy potassium 0,05 0,1

Phosphoric acid 0,1 0,2

Water The Rest

 

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