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Hexavalent chromium free environmentally friendly type paint for steel plates and preparation method thereof

A hexavalent chromium, environmentally friendly technology, applied in anti-corrosion coatings, coatings, etc., can solve the problems of moisture absorption, heat resistance, corrosion resistance and poor tension, and achieve industrialized production and use, low pollution, good quality Effects of stability and coatability

Pending Publication Date: 2019-06-07
NANJING BAOCHUN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] One of the purposes of the present invention is to provide a coating that does not contain hexavalent chromium for the production of directional electrical steel surface coatings, while solving environmental problems, it can solve the problem of phosphate-silicon dioxide that does not contain hexavalent chromium. Problems of poor moisture absorption resistance, heat resistance, corrosion resistance and tension when the system coating forms a coating

Method used

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  • Hexavalent chromium free environmentally friendly type paint for steel plates and preparation method thereof
  • Hexavalent chromium free environmentally friendly type paint for steel plates and preparation method thereof
  • Hexavalent chromium free environmentally friendly type paint for steel plates and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] Use a high magnetic induction oriented electrical steel sheet with a thickness of 0.23mm and a bottom layer of glass film, after shearing, in 3%H 2 SO 4 After light pickling in aqueous solution at 80-85°C for 10s, it is ready for use. Add at least one of boron oxide, boric acid and magnesium borate (referred to as additive A) to the silica sol, and then add Fe 3 o 4 , V 2 o 3 、 Cr 2 o 3 and Mo 2 o 3 At least one of the powders (referred to as additive B) is stirred and ultrasonically dispersed to form a stable suspension, and then mixed with phosphate and stirred to form a coating. Relative to 100g of phosphate in the phosphate, the content of the coating components is shown in the table 1. Apply the paint on the surface of the steel plate by roller coating, then dry it and perform a sintering heat treatment at 850°C×30s. The weight of one side of the coating after sintering is 5.0g / m 2 . The results of the performance investigation of the coatings are summar...

Embodiment 2

[0046] Use a high magnetic induction oriented electrical steel sheet with a thickness of 0.23mm and a bottom layer of glass film, after shearing, in 3%H 2 SO 4 After light pickling in aqueous solution at 80-85°C for 10s, it is ready for use. Add 5g of a boron compound of boron oxide, boric acid or magnesium borate (referred to as additive A) to 90g of silica sol with a particle size of 10nm, and then add 5g of Fe 3 o 4 , V 2 o 3 、Cr 2 o 3 and Mo 2 o 3 An additive in the powder, stirred and ultrasonically dispersed to form a stable suspension, then mixed with magnesium dihydrogen phosphate and stirred to form a coating, the coating contains 100g of phosphate, and the coating components are shown in Table 2. Apply the paint on the surface of the steel plate by roller coating, then dry it and perform a sintering heat treatment at 850°C×30s. The weight of one side of the coating after sintering is 5.0g / m 2 . The results of the performance investigation of the coatings ar...

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Abstract

The invention discloses an environmentally friendly type paint for steel plates and a preparation method thereof. The paint is composed of following components: phosphate; colloidal silicon dioxide; at least one of Fe3O4, V2O3, Cr2O3, and Mo2O3; and at least one of boron oxide, boric acid, and magnesium borate. The preparation method comprises following steps: dispersing one or more of boron oxide, boric acid, and magnesium boride into silica sol; then adding one or more of Fe3O4, V2O3, Cr2O3, and Mo2O3 powder; carrying out mechanical dispersion or ultrasonic dispersion to form a stable mixedsolution; mixing the mixed solution with phosphate, and stirring to form the paint. The invention aims to provide a hexavalent chromium free paint, which can form a coating on the surface of directional electromagnetic steel; the environment pollution is prevented; and at the same time, shortages of a coating formed by a hexavalent chromium free phosphate-silica paint such as bad moisture-proof property, poor heatproof property, bad corrosion resistant property, weak tension force, and the like, can be overcome. The paint has good stability and an excellent coating property and can meet the requirements of massive production.

Description

technical field [0001] The invention relates to a coating and a manufacturing method thereof, in particular to an environment-friendly coating for steel plates and a manufacturing method thereof. Background technique [0002] Phosphate inorganic coatings have good film-forming properties, high temperature resistance, low price, excellent corrosion resistance and electrical insulation, and are widely used in the manufacture of insulating coatings on the surface of steel plates. Phosphate inorganic coatings are mainly composed of phosphate, filler and curing agent. Phosphate is a film-forming substance by forming a network structure during heating. Fillers mainly include silica, alumina, titanium dioxide, etc., which can improve the heat resistance of the coating and improve cracks. Curing agents can lower the film-forming temperature of phosphate coatings and improve the water resistance of the coating. Commonly used curing agents include metal oxides, silicates, boric aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/25C09D5/08C09D7/61
Inventor 杨莲龙吴世旺杨纲
Owner NANJING BAOCHUN NEW MATERIAL TECH CO LTD
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