Preparation method of chromium-free dacromet coating

A technology of mixing solution and acetone, which is applied in coatings, anti-corrosion coatings, etc., can solve the problems of strict restrictions on the use of chromium, and achieve the effects of small corrosion current, strong corrosion resistance, and reduced production costs

Inactive Publication Date: 2016-02-24
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, Dacromet coating contains a large amount of highly toxic and highly carcinogenic hexavalent chromium, and there is still hexavalent chromium in the coating after sintering and curing. The restrictions on the use of chromium are becoming more and more strict worldwide.

Method used

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  • Preparation method of chromium-free dacromet coating
  • Preparation method of chromium-free dacromet coating
  • Preparation method of chromium-free dacromet coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Dissolve 3.5g of thickener hydroxyethyl cellulose in a mixed solution of 30mL of acetone and 30mL of isopropanol, then add 4.77g of polyethylene glycol, 1.0g of ethylene glycol, and 3.0g of polytetrafluoroethylene in sequence , 4.6mL surfactant OP-10 and 2-3 drops of polyether modified silicone defoamer (different stirring or adding process may produce foam, depending on whether foam is generated, selectively add polyether modified silicone Defoamer, the amount of polyether modified silicone defoamer to be added dropwise depends on the amount of foam produced, the following is the same as above), after stirring and mixing evenly, add 80g of scaly zinc powder and 13g of scaly aluminum powder to obtain component A;

[0025] (2) Dissolve 8g of sodium oxalate, 10g of citric acid and 1.3g of boric acid in 30mL of distilled water, then dropwise add 0.5mL of oxidant hydrogen peroxide, stir and mix evenly to obtain component B;

[0026] (3) Add component B to component A un...

Embodiment 2

[0028] (1) Dissolve 3.5g of thickener hydroxyethyl cellulose in a mixed solution of 30mL of acetone and 30mL of isopropanol, then add 4.77g of polyethylene glycol, 1.0g of ethylene glycol, and 3.0g of polytetrafluoroethylene in sequence , 4.6mL of surfactant OP-10 and 2-3 drops of polyether modified silicone defoamer, stir and mix evenly, add 78g of flaky zinc powder and 13g of flaky aluminum powder to obtain component A;

[0029] (2) Dissolve 8g of sodium oxalate, 10g of citric acid and 1.3g of boric acid in 30mL of distilled water, then dropwise add 0.5mL of oxidant hydrogen peroxide, stir and mix evenly to obtain component B;

[0030] (3) Add component B to component A under stirring conditions, then add 1mL polyurethane modified epoxy resin and 1mL KH-570 silane coupling agent, stir and mix evenly to obtain chrome-free dacromet coating solution.

Embodiment 3

[0032] (1) Dissolve 3.5g of thickener hydroxyethyl cellulose in a mixed solution of 30mL of acetone and 30mL of isopropanol, then add 4.77g of polyethylene glycol, 1.0g of ethylene glycol, and 3.0g of polytetrafluoroethylene in sequence , 4.6mL of surfactant OP-10 and 2-3 drops of polyether modified silicone defoamer, stir and mix evenly, add 80g of flaky zinc powder and 13g of flaky aluminum powder to obtain component A;

[0033] (2) Dissolve 8.5g of sodium oxalate, 10g of citric acid and 1.3g of boric acid in 30mL of distilled water, then dropwise add 0.5mL of oxidant hydrogen peroxide, stir and mix evenly to obtain component B;

[0034] (3) Add component B to component A under stirring conditions, then add 1mL polyurethane modified epoxy resin and 1mL KH-570 silane coupling agent, stir and mix evenly to obtain chrome-free dacromet coating solution.

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Abstract

The invention discloses a preparation method of a chromium-free dacromet coating. The method comprises the following steps: (1) dissolving 3.5g of a thickening agent hydroxyethyl cellulose in a mixed solution of acetone and isopropanol, sequentially adding 4.77g of polyethylene glycol, 1.0g of ethylene glycol, 3.0g of polytetrafluoroethylene and 4.6mL of a surface active agent OP-10, mixing evenly by stirring, and adding 72-80g of flaky zinc powder and 12-13g of flaky aluminum powder to obtain a component A; (2) dissolving 7.5-8.5g of sodium oxalate, 10g of citric acid and 1.3g of boric acid in distilled water, then dropwise adding 0.5mL of an oxidant hydrogen peroxide, and mixing evenly by stirring to obtain a component B; and (3) under stirring condition, adding the component B into the component A, then adding polyurethane modified epoxy resin and KH-570 silane coupling agent, and mixing evenly by stirring to obtain the chromium-free dacromet coating. The method adopts multi-salt mixture as a passivating agent to completely replace chromic anhydride, is more friendly to the environment, and has good environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of metal anticorrosion, and in particular relates to a preparation method of a chromium-free dacromet coating solution. Background technique [0002] Dacromet technology is a new type of metal surface anti-corrosion technology developed in recent years, also known as zinc-chromium film. It was originally a surface anti-corrosion coating for automotive parts. Because Dacromet coating has strong corrosion resistance (7-10 times that of electro-galvanized), high heat resistance (it can still be used at about 300°C), strong permeability, no hydrogen embrittlement, good deep coating ability, and combination The advantages of good strength and no pollution to the environment have attracted great attention from people, and they have been gradually used in many fields, such as aerospace, automobile, railway and petrochemical industries. On August 1, 2002, the General Administration of Quality Supervision, Inspectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/10C09D7/12
CPCC09D1/00C09D5/103C09D5/106C09D7/61C09D7/63C09D7/65
Inventor 张圣麟乔静飞张明明张克冰
Owner HENAN NORMAL UNIV
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