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Chrome-free passivant for hot-dip galvanized steel sheet and preparation method thereof

A chrome-free passivating agent, hot-dip galvanized steel sheet technology, applied in the field of steel sheet surface treatment, can solve the problems of easy corrosion of catalpa-plated steel sheet, easy formation of gray and dark color on the surface of galvanized layer, and easy occurrence of rotten candles on galvanized steel sheet, etc. Achieve high corrosion resistance and oxidation resistance, environmentally friendly results

Inactive Publication Date: 2015-09-16
CHANGSHU FENGFAN POWER EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, higher requirements are put forward for the corrosion resistance of the hot-dip galvanized steel sheet, but the galvanized steel sheet is prone to corrosion, which makes the surface of the galvanized layer easy to form a dark gray color, and forms white or black changes during storage. Passivation treatment to improve corrosion resistance
[0004] Although the galvanized steel sheet already has a strong anti-corrosion ability, the galvanized steel sheet is still prone to corrosion in a humid environment, forming white corrosion products or turning gray on the surface, which affects the appearance quality of the galvanized steel sheet and plating corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A chromium-free passivator for hot-dip galvanized steel sheets, comprising: 3 parts of acrylic resin, 1 part of phytic acid, 2 parts of sodium silicate, 1 part of aminotrimethylene phosphonic acid, 2 parts of thiourea, trichloride 1 part of titanium hydrochloric acid solution, 2 parts of tannic acid, 1 part of succinic acid, 2 parts of sodium octane sulfonate, 1 part of benzothiazole, 3 parts of silica sol, 2 parts of phenyltriethoxysilane, hydroxyethylidene 1 part of diphosphonic acid, 2 parts of vanadyl acetylacetonate, 3 parts of polyethyleneimine, and 10 parts of deionized water.

[0020] The preparation method of above-mentioned chromium-free passivating agent for hot-dip galvanized sheet comprises the following steps:

[0021] Step 1, add acrylic resin, phytic acid, sodium silicate, aminotrimethylene phosphonic acid and thiourea into deionized water, heat up to 70°C, stir evenly at 100 rpm, and let cool to obtain mixture I;

[0022] Step 2, adding titanium trichl...

Embodiment 2

[0026] A chromium-free passivator for hot-dip galvanized steel sheets, comprising in parts by weight: 4 parts of acrylic resin, 3 parts of phytic acid, 5 parts of sodium silicate, 2 parts of aminotrimethylene phosphonic acid, 6 parts of thiourea, trichloride 5 parts of titanium hydrochloric acid solution, 4 parts of tannic acid, 3 parts of succinic acid, 3 parts of sodium octane sulfonate, 2 parts of benzothiazole, 5 parts of silica sol, 4 parts of phenyltriethoxysilane, hydroxyethylidene 3 parts of diphosphonic acid, 4 parts of vanadyl acetylacetonate, 6 parts of polyethyleneimine, and 17 parts of deionized water.

[0027] The preparation method of above-mentioned chromium-free passivating agent for hot-dip galvanized sheet comprises the following steps:

[0028] Step 1, add acrylic resin, phytic acid, sodium silicate, aminotrimethylene phosphonic acid and thiourea into deionized water, heat up to 80°C, stir at 200rpm, let cool, and obtain mixture I;

[0029] Step 2, adding ...

Embodiment 3

[0033] A chromium-free passivator for hot-dip galvanized steel sheets, comprising: 7 parts by weight of acrylic resin, 2 parts of phytic acid, 5 parts of sodium silicate, 4 parts of aminotrimethylene phosphonic acid, 6 parts of thiourea, trichloride 5 parts of titanium hydrochloric acid solution, 3 parts of tannic acid, 4 parts of succinic acid, 4 parts of sodium octane sulfonate, 2 parts of benzothiazole, 6 parts of silica sol, 5 parts of phenyltriethoxysilane, hydroxyethylidene 3 parts of diphosphonic acid, 4 parts of vanadyl acetylacetonate, 6 parts of polyethyleneimine, and 14 parts of deionized water.

[0034] The preparation method of above-mentioned chromium-free passivating agent for hot-dip galvanized sheet comprises the following steps:

[0035] Step 1, add acrylic resin, phytic acid, sodium silicate, aminotrimethylene phosphonic acid and thiourea into deionized water, heat up to 70°C, stir evenly at 100 rpm, and let cool to obtain mixture I;

[0036] Step 2, adding...

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PUM

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Abstract

The invention discloses a chrome-free passivant for a hot-dip galvanized steel sheet and a preparation method thereof. The passivant comprises acrylic resin, phytic acid, sodium silicate, ATMP, thiourea, titanium trichloride hydrochloric acid solution, tannin, succinic acid, 1-octanesulfonic acid sodium salt, benzothiazole, silica sol, triethoxyphenylsilane, HEDP, vanadyl acetylacetonate, polyethyleneimine and deionized water. The preparation method of the chrome-free passivant comprises the steps of firstly adding the acrylic resin, the phytic acid, the sodium silicate, the ATMP and the thiourea into the deionized water, heating and stirring, cooling down the mixture, then adding the titanium trichloride hydrochloric acid solution, the tannin, the succinic acid, the 1-octanesulfonic acid sodium salt and the benzothiazole, preserving the heat and stirring, cooling down the mixture and then adding the silica sol, the triethoxyphenylsilane and the HEDP, preserving the heat and stirring, cooling down the mixture, then adding the vanadyl acetylacetonate and the polyethyleneimine, stirring and obtaining the passivant. The passivant disclosed by the invention does not contain chrome and is environmentally friendly, and the galvanized steel sheet passivated by the passivant has higher corrosion resistance and oxidation resistance.

Description

technical field [0001] The invention belongs to the technical field of steel plate surface treatment, and in particular relates to a chromium-free passivator for hot-dip galvanized steel plates and a preparation method thereof. Background technique [0002] Metal purification treatment refers to the method of converting the metal surface into a state that is not easy to be oxidized due to the action of the medium, and delaying the corrosion rate of the metal. The passivation of metals may also be a spontaneous process (such as the formation of a layer of insoluble compounds on the surface of the metal, that is, an oxide film). In industry, passivating agents (mainly oxidizing agents) are used to passivate metals to form a protective film. [0003] Galvanized steel sheet is one of the important protective means of cold-rolled steel sheet, which is widely used in aviation, electric power, transportation, construction, machinery and other industries. The galvanizing process i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/53
Inventor 赵月华顾小蕾尤为
Owner CHANGSHU FENGFAN POWER EQUIP
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