SU426375A3 - SOLUTION FOR PHOSPHATING METAL SURFACE - Google Patents

Description

The invention relates to the field of coating, in particular phosphate films.

A known solution for foofatirovni metal surface containing nickel ions and other divalent metal, such as dink, fasta-ions, an oxidizing agent, for example, measures, nitrate, fluoride in the form of a complex, such as fluorosilicate.

The film obtained from this solution consists of IB bases / nom from zinc phosphates.

The proposed solution differs from the known one in that the ratio of nickel ions to ions of another bivalent metal is chosen to be (1: 0.001) - (1: 0.7) with a certain content of the above components.

This contributes to an increase in the rate of formation of the phosphate film and the strength of its adhesion with subsequent lacquer coating.

The film obtained in this case consists mainly of nickel phosphates.

The proposed solution contains, g / l:

Ions nickel and other

0.5-15.0 divalent metal

but

In an amount sufficient to form monosubstituted phosphates with divalent metal ions

2.0-10.0 0.1-5.0

The ratio of ions tshel with n-opalt of another bivalent metal is (1: 0.0: 01) - (1: 0.7).

As cations of the divalent metal, in addition to zinc, calcium ions, manganese, iron, cobalt and cadmium can be used. The use of zinc, however, is preferred. Concentrates in the form of oxides, carbonates, sulfates, phosphates, nitrates or fluorides serve as the source of cations of two-lehvalent metals.

Nitrate, chlorate, their mixtures, a mixture of nitrite with nitrate or chlorate, as well as sodium nitrobenzene sulfonate can be used as an oxidizing agent.

Fluoride solution is introduced in the form of a complex, in particular in the form of a fluoroborate, fluorotitanate and fluorosilicate of alkali metals, or in the form of the corresponding fluoric acids.

It is advisable to prepare the phosphating solution by diluting the concentrates containing the components in the appropriate ratios.

In the Нр01Цвсс phosphatizing solution, as it is being produced, it is necessary to correct it by adding a concentrate in which the ratio of total free acidity is chosen to be (2.5; 1) - (6.0: 1).

The process of fsyufatir ani steel or iron surface. Of the proposed solution Is carried out by immersion, dousing or spraying at 55-75 ° C, the Schnof surface at 45-75 ° C.

The result is a dense, uniform coating thickness of 0.2-0.5 g / l.

Reception p. Solution containing ZJA:

Nickel phosphate monosubstituted 6.9

Phosphoric acid 0.14

Nitric acid 0,38

Ammonium Nitrate1,12

NaCl2,16 chloride sulphide

acid0,59

By pouring, the steel sheets are treated at 55 ° C for a second, at 60 ° C for 30-60 s, at 70 ° C for i20-30 s. The sheets are then washed with tap water, lascified for 10 seconds at 60 ° C in a solution containing 0.2 g / l of chromic anhydride, and dried in a stream of warm air.

The result is a solid phosphate film of dark color.

With the same solution, steel sheets subjected to hot-dip galvanizing are treated with drenching: at 50 ° C - for 15-60 seconds, at 60 ° C - for 8-30 seconds,

at 70 ° C - for 5-15 seconds. After intermediate lRO | MY1B KI with water, passivation, and sushi1K1, phosphate films are obtained from ocher to gray-black.

Dense and uniform coatings were obtained on all sheets. . When the temperature rises and the treatment time increases, thicker coatings are obtained.

Sheets treated in this way are subjected to bending and deep drawing. Damage -coating is not observed.

Subject and z o b Reteni

A solution for phosphating a metal surface containing nickel ions and another bivalent metal, e.g. zinc, phosphate ions, an oxidizing agent, e.g. nitrate, fluoride in the form of a complex, e.g. with the subsequent lacquer coating, the ratio of IONS to nickel with ions of another bivalent metal is chosen to be (1: 0.001) - (1: 0.7) with the following content of the above components, g1l:

Ions of nickel and other bivalent metal 0.5-15.0

In an amount sufficient to form monosubstituted phosphates with divalent metal ions

2.0-10.0 0.1-5.0