The solution for the simultaneous degreasing and phosphating

 

(57) Abstract:

The invention relates to chemical treatment of metal, in particular, compositions intended for the treatment of products with complex configuration. This invention can be used in various fields of national economy - mechanical engineering, plant engineering, etc before paint application. The metal surface is treated with a solution containing, g/l: ions of zinc (Zn)2+1.92-10.5, nitrate ions, NO3-0.76-5.85, phosphate ions in terms of P2ABOUT54.68-25.4, ethoxylated monoalkylphenols based trimers of propylene: neonol AF 9-12 0.014-0.07, neonol AF 9-6 0.014-0.07, ethanol 0.012-0.06, modifying additives: Ni2+0.06-0.7, F-0.04-0.3, water - the rest. The use of the proposed solution allows to obtain high corrosion resistance of phosphate coatings in combination with a paint coating, to obtain a high adhesion of the paint coating, to increase the surface density of the coating, to increase the life of the product. table 1.

The invention relates to chemical treatment of metal, in particular, compositions intended for the treatment of products with complex configuration is to be used in various fields of national economy (engineering, power, and so on) for the purpose of processing the metal surface before applying the paint coating (hereinafter LCP).

A known solution for the simultaneous degreasing and phosphating of metal surfaces (1) (RF patent 2063476) that contains, wt%:

Phosphate ions (in terms of P2ABOUT5) - 0,34-1,0

Nitrate ions (in terms of NO3) - 0,02-0,07

Ions of molybdenum (Mo6+) - 0.001-0.012

Polietilenglikolya ether synthetic fatty alcohols selected from the group DC-10, DT-7 alkylpolyoxyethylene - 0,00036-0,0016

Water - the Rest

The closest in technical essence and the achieved result is a solution to the simultaneous degreasing and phosphating (2) (RF patent 2090651) that contains, wt%:

Phosphate ions (in terms of P2ABOUT5) - 0,49-1,2

Nitrate ions - 0,02-0,08

Ethoxylated monoalkylphenols based trimers of propylene neonol AF 9-10, neonol AF 9-12, grade a - 0,004-0,015

Water - the Rest

The disadvantages of this solution are: low surface coverage density (zelenotsvitna-amorphous) from 0.2 to 1 g/m2due to this low corrosion resistance of phosphate coatings in combination with QTL.

is silvania and phosphating of metal, forming a coating with high corrosion resistance in combination with QTL and high surface coverage density.

This object is achieved in that the metal surface is treated with a solution containing, g/l:

Zinc ions Zn2+- 1,92-10,5

Nitrate ions NR3-- 0,76-5,85

Phosphate ions in terms of P2ABOUT5- 4,68-25,4

Ethoxylated monoalkylphenols based on the trimer of propylene neonol AF 9-12 - 0,014-0,07

Ethanol - 0,012-0,06

Modifying additives: Ni2+- 0,06-0,7

F-- 0,04-0,3

Ethoxylated monoalkylphenols based on the trimer of propylene neonol AF 9-6 - 0,014-0,07

Water - the Rest

The working solution for the simultaneous degreasing and phosphating prepared by the rate of dilution water 20-100 g of concentrated solution up to 1 litre.

The concentrated solution is prepared by mixing zinc oxide, nitrate-containing raw material in the form of nitric acid or nitrate zinc phosphate containing raw materials in the form of phosphoric acid or monophosphate zinc, kremneftoristogo acid, an aqueous solution of Nickel nitrate, as well as additional solution obtained by mixing ethanol, ethoxylated monoalkyl kilfenora based trimers of propylene neonol AF 9-6 and neonol AF 9-12 issued by TU 2483-077-05766801-98, WPI. 1.

Then, the solution adjusted with caustic soda or soda ash to a certain level of free acidity (0.2 to 1.5 points) depending on the concentration of the solution and method of coating.

The selected ratio of the components allows you to get from 2 to 10 minutes crystalline zincphosphate coating, ensuring high corrosion resistance and high adhesion phosphate coating in combination with QTL.

After dilution of the concentrated composition in water, adjusting it to a certain level of free acidity put it on the metal surface with the 1st degree of zagarenski different ways: immersion or spraying.

The tests were carried out on samples of cold-rolled sheet steel 08 KP or 08 PS or 08 Yu (GOST 16523-70), thickness 0.8-0.9 mm in size 150-70 mm

Surface preparation of the samples before applying QTL was performed according to the schema (schema, see end of text).

The resulting samples to determine the surface density of the coating according to GOST 9.402-80 weight way.

Further samples of the applied paint film and carry out tests on the corrosion resistance of the coating and adhesion.

Corr is ararauna sprayed 5% solution of sodium chloride. The temperature is maintained automatically within 34-37oC. the Examination of samples carried out by the naked eye in natural diffused light. The tests were carried out before the first appearance of visible corrosion. The longer the time until corrosion, the higher the resistance of phosphate coatings.

Adhesion is defined points in accordance with GOST 15140-78 method of lattice cuts.

A score of 1 is assigned if the cut edges are completely smooth and there are no signs of exfoliation in any square of the grid.

A score of 2 is assigned if there is a slight peeling of the coating at the intersections of the grid lines, and violations are observed not more than 5% of the surface area of the grid.

A score of 3 is assigned if there is a partial or complete delamination of the coating along the lines of incisions grill or in their intersections, violations are observed less than 5% and more than 35% of the surface area of the grid.

A score of 4 is assigned if there is peeling of more than 35% of the square lattice.

The essence of the invention is illustrated by the following examples:

Example 1

Samples of steel 08 KP processed by SUB>3- 0,76

Neonol AF 9-12 - 0,014

Ethanol - 0,012

Modifying additives: Ni2+- 0,06

F-- 0,04

Neonol AF 9-6 - 0,014

Water - the Rest is up to 1 litre

After testing corrosion resistance, adhesion and surface coverage density were obtained the following results:

Corrosion resistance, h - 400

The adhesion score - 1

The surface coverage density, g/m2- 2,2

Example 2

Samples of steel 08 KP was processed by the above scheme the solution of the following composition, g/l:

Zn2+- 6,21

P2O5- 15,04

NO3-- 3,31

Neonol AF 9-12 - 0,042

Ethanol is being 0.036

Modifying additives: Ni2+- 0,38

F - 0,17

Neonol AF 9-6 - 0,042

Water - the Rest is up to 1 litre

After testing corrosion resistance, adhesion and surface coverage density were obtained the following results:

Corrosion resistance, h - 410

The adhesion score - 1

The surface coverage density, g/m - 2,4

Example 3

Samples of steel 08 KP was processed by the above scheme the solution of the following composition, g/l:

Zn2+- 10,5

P2O5- 25,4

NO3-- 5,85

Neo - on 07

Water - the Rest is up to 1 litre

After testing corrosion resistance, adhesion and surface coverage density were obtained the following results:

Corrosion resistance, h - 380

The adhesion score - 1

The surface coverage density, g/m2- 2,9

Example prototype

P2ABOUT5- 0,89

NO3-- 0,05

Ethoxylated monoalkylphenols based trimers of propylene - 0,0095

The surface coverage density, g/m2- 0,64

The adhesion score - 1

Elasticity, mm - 10

Impact strength N. cm - 500

The test results illustrate the effect of the concentration of the components of the solution on the quality of the phosphate layer, adhesion and its corrosion resistance in combination with QTL.

Using the proposed method provides the following technical and economic advantages:

- high adhesion;

- high corrosion resistance of phosphate coatings in combination with a paint coating;

- increase the life of the product;

- getting zincphosphate coverage.

Literature

1. RF patent 2063476.

2. RF patent 2090651 (prototype).

The solution for odnovremenno the hydrated monoalkylphenol based on the trimer of propylene neonol AF 9-12 and water, characterized in that it additionally contains zinc ions, ethanol, modifying additive is Nickel ions and fluorine, and ethoxylated monoalkylphenols based on the trimer of propylene neonol AF 9-6 at the following content of components, g/l:

Zinc ions Zn2+- 1,92 - 10,5

Nitrate ions NO3-- 0,76 - 5,85

Phosphate ions in terms of P2ABOUT5- 4,68 - 25,4

Ethoxylated monoalkylphenols based trimers of propylene:

Neonol AF 9-12 - 0,014 - 0,07

Neonol AF 9-6 - 0,014 - 0,07

Ethanol - 0,012 - 0,06

Modifying additives: Ni2+- 0,06 - 0,7

F-- 0,04 - 0,3

Water - The Rest

 

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