Metal passivation solution and preparation method thereof and hot-dip plated metal material

A technology of metal passivation and alkali metal salt, which is applied in the field of hot-dip metal materials and metal passivation solution, can solve the problem of low corrosion resistance of the protective film, and achieve the effect of excellent storage resistance and excellent corrosion resistance

Inactive Publication Date: 2014-09-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the defect that the corrosion resistance of the protective film formed by the existing metal passivation solution is still low, the invention provides a metal passivation solution, a method for preparing the metal passivation solution, and the metal Passivation solution and a hot-dip metal material

Method used

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  • Metal passivation solution and preparation method thereof and hot-dip plated metal material

Examples

Experimental program
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preparation Embodiment 1

[0050] This preparation example is used to illustrate the method in the reference document CN101608073B to obtain a trivalent chromium source by reducing a hexavalent chromium compound with a reducing agent.

[0051] Add 300 kg of deionized water to a 3000 liter enamel reactor, then add 50 kg of chromic anhydride (CrO 3 ), start the stirrer of the reactor and stir for 10 minutes to dissolve the chromic anhydride. After the chromic anhydride is completely dissolved, add 100 kg of citric acid at room temperature, and start the stirrer quickly to dissolve the citric acid quickly. When the solution does not bubble, it is judged that the reaction is complete, and the required trivalent chromium source is obtained.

Embodiment 1

[0053] Add 10g of phosphonic acid complexing agent (ethylenediaminetetramethylenephosphonic acid, purchased from Shandong Taihe Water Treatment Co., Ltd., No. CAS No.1429-50-1) and 20g of aluminum dihydrogen phosphate to 20g of water, in Mix until uniform at a stirring speed of 1500 rpm to obtain a first solution.

[0054] 7g of trivalent chromium source (the trivalent chromium source prepared in Preparation Example 1, the amount added is calculated by the amount of chromium element), 56g of silica filler (nano silica sol, purchased from Shandong Baite New Material Co., Ltd. company, the brand name is SS-30, and the amount added is based on silica), 65g of water-soluble film-forming resin (made from an equal amount of styrene-acrylic emulsion (purchased from Guangzhou Chaolong Chemical Technology Co., Ltd., the brand name is xy-108b benzene Acrylic emulsion, the solid content is 48% by weight, and the viscosity is 500-1000mPa·s) and fluorocarbon emulsion (purchased from Beijin...

Embodiment 2

[0057] Add 10 g of phosphonic acid complexing agent (pentasodium ethylenediamine tetramethylene phosphonate, purchased from Shandong Taihe Water Treatment Co., Ltd., No. CAS No. 7651-99-2) and 10 g of aluminum dihydrogen phosphate into 30 g of water , and mix until uniform at a stirring speed of 1500 rpm to obtain a first solution.

[0058] 5g of trivalent chromium source (the trivalent chromium source prepared in Preparation Example 1, the amount added is calculated as the amount of chromium element), 65g of silica filler (nano-silica sol, purchased from Shandong Baite New Material Co., Ltd. company, the brand is SS-30, and the amount added is based on silica), 75g of water-soluble film-forming resin (fluorocarbon emulsion (purchased from Beijing Capital Nano Technology Co., Ltd., water-based fluorocarbon emulsion with the brand of SKFT-I, solid The content is 45% by weight, the viscosity is 500-1000mPa·s)) and 10g of sodium phosphate are added to 570g of water, and mixed unt...

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Abstract

The invention provides a metal passivation solution. The metal passivation solution contains water, a phosphonic acid complexing agent, aluminum dihydrogen phosphate, a trivalent chromium source, a silica filler and water-soluble film-forming resin; the phosphonic acid complexing agent is at least one of ethylenediamine tetra(methylenephosphonic acid), an alkali metal salt of ethylenediamine tetra(methylenephosphonic acid), hexamethylenediamine tetra(methylenephosphonic acid) and an alkali metal salt of hexamethylenediamine tetra(methylenephosphonic acid). The invention also provides a method for preparing the metal passivation solution. The invention further provides the metal passivation solution prepared according to the method. The invention also provides a hot-dip plated metal material which comprises a hot-dip plated metal substrate and a coating layer adhering onto the hot-dip plated metal substrate, wherein the coating layer is a cured product of the metal passivation solution. The coating layer obtained by curing has more excellent corrosion resistance at high temperatures or after high temperatures, moreover, trivalent chromium in the coating layer cannot be converted into hexavalent chromium at the high temperatures, and the requirements of environmental protection are completely met.

Description

technical field [0001] The invention relates to the field of metal protection, in particular to a metal passivation solution, a method for preparing the metal passivation solution, the metal passivation solution obtained by the method and a hot-dip metal material. Background technique [0002] Hot-dip metal materials, including hot-dip galvanized metal materials and hot-dip galvanized metal materials, in order to prevent corrosion, a layer of metal protective paint will be coated on the surface of the hot-dip metal materials to form a protective film. Therefore, the performance of metal protective coatings is very important for the anti-corrosion of hot-dip metal materials. [0003] It is an important choice to use chromium-containing paint to form a protective film on the surface of hot-dip metal materials, and has a large market share. However, on February 13, 2003, the European Parliament and the Council passed the Directive on the Restriction of the Use of Certain Hazar...

Claims

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Application Information

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IPC IPC(8): C09D167/00C09D125/14C09D163/00C09D175/04C09D133/04C09D133/00C09D127/12C09D7/12C09D5/08B32B15/08
Inventor 许哲峰陈永徐权汤佩林周一林
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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