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Trivalent chromium coating and preparation method thereof and hot-dip plated metal material

A trivalent chromium and coating technology, applied in anti-corrosion coatings, polyester coatings, metal layered products, etc., can solve the problem of low corrosion resistance of protective films, 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

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Problems solved by technology

[0007] In order to overcome the defect that the corrosion resistance of the protective film formed by the existing trivalent chromium coating is still low, the invention provides a trivalent chromium coating, a method for preparing the trivalent chromium coating, and the trivalent chromium coating obtained by the method. Valence chrome paint and a hot-dip metal material

Method used

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  • Trivalent chromium coating and preparation method thereof and hot-dip plated metal material

Examples

Experimental program
Comparison scheme
Effect test

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] 10g of phosphonic acid complexing agent (2-phosphonobutane-1,2,4-tricarboxylic acid, purchased from Shandong Taihe Water Treatment Co., Ltd., number CAS No.37971-36-1) and 20g of phosphoric acid Aluminum dihydrogen was added to 20 g of water, and mixed 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 (pur...

Embodiment 2

[0057] Add 10 g of phosphonic acid complexing agent (2-hydroxyphosphonoacetic acid, purchased from Shandong Taihe Water Treatment Co., Ltd., No. CAS No. 23783-26-8) and 10 g of aluminum dihydrogen phosphate into 30 g of water, at 1500 rpm Mix at a stirring speed of 1 / min until uniform to obtain the 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 until uniform at a st...

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Abstract

The invention provides a trivalent chromium coating, wherein the trivalent chromium coating contains water, a phosphonic acid complexing agent, aluminum dihydrogen phosphate, a trivalent chromium source, a silica filler and water-soluble film-forming resin. The invention also provides a method for preparing the trivalent chromium coating. The invention further provides the trivalent chromium coating 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 hot-dip plated metal substrate is at least one of a hot-dip zinc-plated metal substrate, a hot-dip aluminum-zinc plated metal substrate and a hot-dip aluminum-zinc-magnesium plated metal substrate; and the hot-dip plated metal material is characterized in that the coating layer is a cured product of the trivalent chromium coating. 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 trivalent chromium coating, a method for preparing the trivalent chromium coating, the trivalent chromium coating 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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Patent Type & Authority Applications(China)
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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