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Galvanized layer chromium-free passivating agent and preparation method thereof

A technology of chromium-free passivation agent and galvanized layer, applied in the direction of metal material coating process, etc., can solve the problem that the performance of the passivation film cannot meet the needs, and achieve the effect of excellent corrosion resistance and enhanced passivation performance.

Active Publication Date: 2015-03-11
WUXI EPIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the chromium-free passivating agents disclosed above for the galvanized layer have all reached a certain protective effect, the performance of the passivation film still cannot meet the needs, and it is necessary to further improve the properties of the passivation film, so further research and development is required. A passivator with superior performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A chromium-free passivator for zinc plating, comprising: 5 parts of sodium bisulfate, 2 parts of sodium tripolyphosphate, 1 part of sodium alkylbenzene sulfonate, 8 parts of ammonium acetate, 0.5 part of aluminum oxide in terms of weight components, 1 part of starch, 2 parts of thiourea, 3 parts of dicyclohexylamine nitrite, 2 parts of methyl cellulose, 1 part of methylparaben, 0.8 part of ethylene glycol monostearate, 800 parts of deionized water.

[0022] The preparation method of the chromium-free passivating agent for the galvanized layer described above comprises the following preparation steps:

[0023] Step 1, taking each component according to parts by weight;

[0024] Step 2, adding sodium bisulfate, sodium tripolyphosphate, sodium alkylbenzenesulfonate, ammonium acetate and thiourea into deionized water, stirring and mixing at room temperature, the condition is that the stirring speed is 150 rpm, and the stirring time is 30 minutes. Obtain mixed solution one;...

Embodiment 2

[0028] A chromium-free passivator for zinc plating, comprising: 6 parts of sodium bisulfate, 3 parts of sodium tripolyphosphate, 3 parts of sodium alkylbenzene sulfonate, 10 parts of ammonium acetate, 0.8 part of aluminum oxide in terms of weight components, 2 parts of starch, 4 parts of thiourea, 5 parts of dicyclohexylamine nitrite, 5 parts of methyl cellulose, 3 parts of methylparaben, 1.3 parts of ethylene glycol monostearate, 880 parts of deionized water.

[0029] The preparation method of the chromium-free passivating agent for the galvanized layer described above comprises the following preparation steps:

[0030] Step 1, taking each component according to parts by weight;

[0031] Step 2, adding sodium bisulfate, sodium tripolyphosphate, sodium alkylbenzenesulfonate, ammonium acetate and thiourea into deionized water, stirring and mixing at room temperature, the condition is that the stirring speed is 160 rpm, and the stirring time is 32 minutes. Obtain mixed solution...

Embodiment 3

[0035] A chromium-free passivating agent for galvanized layer, comprising by weight components: 7 parts of sodium bisulfate, 4 parts of sodium tripolyphosphate, 4 parts of sodium alkylbenzene sulfonate, 12 parts of ammonium acetate, 1.3 parts of aluminum oxide, 3 parts of starch, 5 parts of thiourea, 6 parts of dicyclohexylamine nitrite, 6 parts of methyl cellulose, 4 parts of methylparaben, 1.6 parts of ethylene glycol monostearate, 930 parts of deionized water.

[0036] The preparation method of the chromium-free passivating agent for the galvanized layer described above comprises the following preparation steps:

[0037] Step 1, taking each component according to parts by weight;

[0038] Step 2: Add sodium bisulfate, sodium tripolyphosphate, sodium alkylbenzenesulfonate, ammonium acetate and thiourea into deionized water, stir and mix evenly at room temperature, the condition is that the stirring speed is 170 rpm, and the stirring time is 36 minutes. Obtain mixed solution...

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PUM

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Abstract

The invention discloses a galvanized layer chromium-free passivating agent and a preparation method thereof. The passivating agent comprises the following components: sodium hydrogen sulfate, sodium tripolyphosphate, sodium alkyl benzene sulfonate, ammonium acetate, alumina, starch, thiourea, dicyclohexylamine nitrite, methyl cellulose, methylparaben, ethylene glycol monostearate and deionized water. The preparation method includes: adding sodium hydrogen sulfate, sodium tripolyphosphate, sodium alkyl benzene sulfonate, ammonium acetate, and thiourea into the deionized water, stirring and mixing the materials evenly at room temperature to obtain a mixed solution 1; adding alumina, starch, dicyclohexylamine nitrite, methyl cellulose, methylparaben and ethylene glycol monostearate into ethanol absolute, subjecting ethanol to heating refluxing, and conducting filtering to obtain a solid mixture, and performing drying to obtain an intermediate 1; then adding the intermediate 1 into the mixed solution 1 obtained in step two, and conducting stirring mixing under a vacuum heating condition, thus obtaining the galvanized layer chromium-free passivating agent. The galvanized layer chromium-free passivating agent provided by the invention has excellent corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of preparation of passivating agents for metal coatings, and in particular relates to a chromium-free passivating agent for zinc coatings and a preparation method thereof. Background technique [0002] On the metal parts substrate, galvanized as a protective coating is one of the most widely used electroplating varieties in the electroplating industry. Since the standard electrode potential of zinc is negativer than that of iron, the coating on the substrate of metal parts usually needs passivation treatment to form a dense passivation film to be used as a protective coating. The traditional galvanized layer is mainly passivated by chromate solution. Since hexavalent chromium in chromate solution is a toxic substance and has carcinogenic effects, European and American countries have introduced a series of relevant laws to restrict the use of hexavalent chromium. [0003] Environmentally friendly passivation...

Claims

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Application Information

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IPC IPC(8): C23C22/23
CPCC23C22/07
Inventor 尤为
Owner WUXI EPIC TECH
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