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A kind of low-temperature passivator for galvanized steel sheet and preparation method thereof

A technology of galvanized steel sheet and passivating agent, which is applied in the coating process of metal materials, etc., to achieve the effects of lower drying temperature, easy availability of raw materials, and broad application prospects

Inactive Publication Date: 2016-11-23
XIANGSHUI YIXIN WEIYE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although its composition does not contain chromium, the performance of the galvanized steel sheet after passivation treatment needs to be further improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A low-temperature passivation agent for galvanized steel sheets consists of the following components in parts by mass: nano-SiO 2 5 parts, 2 parts of ethylenediamine tetramethylene phosphonic acid, 5 parts of potassium fluorosilicate, 3 parts of zinc phosphate, 5 parts of manganese dihydrogen phosphate, 10 parts of styrene, 2 parts of sodium metaaluminate, 3 parts of ethylene glycol parts, phosphoric acid 2 parts, deionized water 95 parts.

[0025] A preparation method for a low-temperature passivating agent for galvanized steel sheets, comprising the following steps:

[0026] a. Weigh the constituents respectively, first mix ethylene glycol, phosphoric acid and deionized water, then add zinc phosphate, and then add manganese dihydrogen phosphate and sodium metaaluminate after dissolving, and obtain solution 1 after dissolving;

[0027] b. Mix styrene, potassium fluorosilicate and ethylenediaminetetramethylenephosphonic acid evenly under stirring conditions to obtain s...

Embodiment 2

[0030] A low-temperature passivation agent for galvanized steel sheets consists of the following components in parts by mass: nano-SiO 2 8 parts, 4 parts of ethylenediamine tetramethylene phosphonic acid, 7 parts of potassium fluorosilicate, 8 parts of zinc phosphate, 10 parts of manganese dihydrogen phosphate, 15 parts of styrene, 8 parts of sodium metaaluminate, 5 parts of ethylene glycol parts, phosphoric acid 4 parts, deionized water 105 parts.

[0031] A preparation method for a low-temperature passivating agent for galvanized steel sheets, comprising the following steps:

[0032] a. Weigh the constituents respectively, first mix ethylene glycol, phosphoric acid and deionized water, then add zinc phosphate, and then add manganese dihydrogen phosphate and sodium metaaluminate after dissolving, and obtain solution 1 after dissolving;

[0033] b. Mix styrene, potassium fluorosilicate and ethylenediaminetetramethylenephosphonic acid evenly under stirring conditions to obtain...

Embodiment 3

[0036] A low-temperature passivation agent for galvanized steel sheets consists of the following components in parts by mass: nano-SiO 2 6 parts, 3 parts of ethylenediamine tetramethylene phosphonic acid, 6 parts of potassium fluorosilicate, 4 parts of zinc phosphate, 6 parts of manganese dihydrogen phosphate, 11 parts of styrene, 3 parts of sodium metaaluminate, 4 parts of ethylene glycol parts, phosphoric acid 3 parts, deionized water 98 parts.

[0037] A preparation method for a low-temperature passivating agent for galvanized steel sheets, comprising the following steps:

[0038] a. Weigh the constituents respectively, first mix ethylene glycol, phosphoric acid and deionized water, then add zinc phosphate, and then add manganese dihydrogen phosphate and sodium metaaluminate after dissolving, and obtain solution 1 after dissolving;

[0039] b. Mix styrene, potassium fluorosilicate and ethylenediaminetetramethylenephosphonic acid evenly under stirring conditions to obtain s...

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Abstract

The invention discloses a low-temperature passivating agent for a galvanized steel sheet and a preparation method of the low-temperature passivating agent. The passivating agent comprises the following components in parts by mass: 5-8 parts of nano SiO2, 2-4 parts of ethylenediamine tetramethylenephosphonic acid, 5-7 parts of potassium fluosilicate, 3-8 parts of zinc phosphate, 5-10 parts of manganous dihydrogen phosphate, 10-15 parts of styrene, 2-8 parts of sodium metaaluminate, 3-5 parts of ethylene glycol, 2-4 parts of phosphoric acid and 95-105 parts of deionized water. The preparation method comprises the following steps: a, respectively weighing the components; b, preparing a solution 2; and c, adjusting the pH value of the solution to 3-5. The low-temperature passivating agent prepared by adopting the method does not contain chromium; and the processed galvanized steel sheet is excellent in performance, simple in formula, available in raw materials, convenient to use, and relatively good in passivation effect.

Description

technical field [0001] The invention relates to the technical field of surface treatment of steel plates, in particular to a low-temperature passivator for galvanized steel plates and a preparation method thereof. Background technique [0002] Hot-dip galvanizing is the most commonly used protective cathodic protection method, but the galvanized layer is easily corroded in the air. In order to prevent the corrosion of the galvanized layer, passivation treatment is required. The traditional passivation method is to coat the surface of the hot-dip galvanized steel sheet with a hexavalent chromium passivation agent, and form a passivation layer containing hexavalent chromium salt after drying. , but hexavalent chromium is toxic and carcinogenic, which not only affects human health, but also easily causes harm to the environment, and it will be gradually eliminated by the market. Directives issued by the European Union clearly restrict the use of hexavalent chromium. In the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/36
CPCC23C22/364
Inventor 席海军
Owner XIANGSHUI YIXIN WEIYE TECH CO LTD