RU2441896C1 - Protective compound for autodeposition on the surface of ferrous alloy items - Google Patents

Abstract

FIELD: metallurgy. ^ SUBSTANCE: invention relates to the anticorrosive protection of items made of ferrous alloys (steel, cast iron). The protective compound for autodeposition on the surface of ferrous alloy items comprises, weight %: primer ÆÜ -0207 on the basis of a solution in isopropyl solution and diacetone alcohol of partial ester maleinized 1.4- cis-polybutadiene mixed with esterified ethyl alcohol, resyl carbonic acids of bisphenol A, with an addition of the antioxidant being ionol 14-16, 25% of aqueous ammonia 0.45-0.55, isopropyl alcohol 32.93- 33.73, water 50.54-51.77. ^ EFFECT: obtaining of a protective compound not containing highly toxic components as well as thin film on the surface of ferrous alloy items with reduction of the varnish-containing Ü-0125 component. ^ 1 tbl, 1 dwg

Description

The invention relates to anticorrosive protection of products from alloys based on iron (steel, cast iron).

Known protective composition, including: varnish KCH-0125 270-300 g / l; xylene 4-5 g / l; 25% aqueous ammonia solution 12-15 ml / l; xylene 4-5 ml / l; a mixture of isopropyl alcohol and water (1: 1, 6: 4) up to 1 liter, at a pH of the composition 7.0-7.2 [1]. This composition provides for a large consumption of varnish KCh-0125 and the use of a toxic component - xylene.

The objective of the invention is to reduce the toxicity of the composition, reducing the proportion of varnish containing KCh-0125 component.

The technical result is achieved by the fact that the protective composition for auto-deposition on the surface of products made of iron-based alloys includes a primer VKCh-0207 based on a solution of maleated 1,4 cis-butadiene rubber mixed with isopropyl and diacetone alcohol mixed with ethyl esterified bisphenol resilcarboxylic acids And with the addition of the antioxidant ionol, 25% aqueous ammonia solution, isopropyl alcohol, water in the following ratio of components, wt.% .: primer VKCh-0207 14,0-16,0; 25% aqueous ammonia 0.45-0.55; isopropyl alcohol 32.93-33.73; water 50.54-51.77.

Primer VKCH-0207, manufactured by industry, is a suspension of pigments (titanium dioxide, strontium chromate, carbon black and lead silica chromate) and fillers (microtalc, aluminosilicate pigment) in 64% KCH-0125 varnish solution in isopropyl (32-34%) and diacetone (3 -5%) alcohols of the partial ester of maleated 1,4 cis-butadiene rubber mixed with ethyl esterified bisphenol A resilicarboxylic acids (70:30 by weight of rubber and phenolic components). Ionol is added as an antioxidant.

The compositions of the protective composition for auto-deposition on the surface of products from alloys based on iron are shown in the table.

Table Components: Composition, wt.%: one 2 3 four primer VKCh-0207 14.0 15.0 16,0 16,0 25% aqueous ammonia solution 0.5 0.45 0.55 0.53 isopropyl alcohol 33.73 33.35 32.93 32.93 water 51.77 51,2 50.52 50.54

Prepare steel products. Organic solvents, such as white spirit, are used to remove contaminants from the surface of products. Products are treated in organic solvents by immersion in a bath, washed and transferred to the etching operation, which is carried out in 3% HCl at a temperature of 20 ° C for 2-3 minutes. Next, the details are transferred to a phosphating bath of the following composition (g / l): Majef salt - 30-40; Zn (NO ₃ ) ₂ - 50-60 g / l; NaNO ₂ - 3-4 g / l; saccharin - 1-2 g / l; nitrilotriacetic acid - 5-7 g / l; OS-20 preparation - 5-10 g / l [2]. At a temperature of 20-60 ° C for 10-15 minutes, a phosphate film is formed on the surface of the steel product. After phosphating, the articles are washed with water and transferred to autoprecipitation in a bath prepared as follows.

The components (primer VKCh-0207, 25% aqueous ammonia solution, isopropyl alcohol, water) are dosed in the required quantities. Isopropyl alcohol is added to the water and mixed. Primer VKCh-0207 is neutralized with 25% aqueous ammonia solution and mixed. Then the resulting mass is diluted with a mixture of isopropyl alcohol-water. The pH value of 6.5-7.0 is adjusted by adding 25% aqueous ammonia or primer VKCh-0207.

Auto-deposition is carried out at a temperature of 20 ° C for 3-5 minutes. The curing of the obtained gel-like precipitates is carried out at a temperature of 130-150 ° C for 1-2 hours or at a temperature of 25 ° C during the day. The thickness of the polymer layer is 1.5-3 microns.

The proposed protective composition does not contain highly toxic components, provides thin protective films on the surface of products made of iron-based alloys while reducing the proportion of component containing varnish KCh-0125.

Information sources

1. RU 2142971, 1999.

2. RU 2370569, 2009.

Claims (1)

Protective composition for auto-deposition on the surface of products made of iron-based alloys, including a primer VKCh-0207 based on a solution in isopropyl and diacetone alcohol of a partial ester of maleated 1,4-cis-butadiene rubber mixed with ethyl esterified bisphenol A resilicarboxylic acids with an additive of antioxidant ionol, 25% aqueous ammonia, isopropyl alcohol, water in the following ratio of components, wt.%: primer VKCH 0207 14,0-16,0; 25% aqueous ammonia 0.45-0.55; isopropyl alcohol 32.93-33.73; water 50.54-51.77.