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Composition for magnesium alloy surface activation

A surface activation and composition technology, which is applied in the coating process of metal materials, can solve the problems of harmful substances to the human body and the environment and poor treatment effect, and achieve no pollution to the human body and the environment, long-lasting activation effect, and smooth surface Effect

Active Publication Date: 2008-06-25
南通江海港建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art that the surface treatment effect of magnesium alloy is poor or that it contains substances harmful to the human body and the environment, and to provide a magnesium alloy surface that does not contain substances harmful to the human body and the environment and has a good surface treatment effect on magnesium alloys. Activation composition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This example is used to illustrate the magnesium alloy surface activation composition and its preparation method provided by the present invention.

[0021] 0.1 g of pyrophosphoric acid, 1.9 g of lactic acid, 2 g of hydroxyethylene diphosphonic acid (Shandong Taihe Chemical Plant, HEDP), 0.1 g of water-soluble benzotriazole (Nanjing Xincheng Additive Factory, BTA), 5 g of alkyl Alcohol polyoxyethylene ether (Shanghai Capite Chemical Co., Ltd., AEO-9) was mixed with 0.9 g of ferric nitrate to obtain composition S1 for activating the surface of magnesium alloy provided by the present invention.

[0022] Based on the total amount of the composition, the content of pyrophosphoric acid is 1% by weight, the content of lactic acid is 19% by weight, the content of hydroxyethylene diphosphonic acid is 20% by weight, and the content of water-soluble benzotriazole is 1% by weight %, the content of alkyl alcohol polyoxyethylene ether is 50% by weight, and the content of iron nitrat...

Embodiment 2

[0026] This example is used to illustrate the magnesium alloy surface activation composition and its preparation method provided by the present invention.

[0027] 2 grams of pyrophosphoric acid, 0.5 grams of oxalic acid, 1.5 grams of diethylenetriaminepentamethylenephosphonic acid (Shandong Taihe Chemical Plant, DETPMP), 1 gram of hexamethylenetetramine (Shandong Ruixing Biochemical Co., Ltd., Uzbekistan Rothpin), 4 grams of alkylphenol polyoxyethylene ether (Jiangyin Huayuan Chemical Co., Ltd., OP-10) and 1 gram of ferric nitrate were mixed to obtain the magnesium alloy surface activation composition S2 provided by the invention.

[0028] Based on the total amount of the composition, the content of pyrophosphoric acid is 20% by weight, the content of oxalic acid is 5% by weight, the content of diethylenetriaminepentamethylenephosphonic acid is 15% by weight, hexamethylenetetra The amine content was 10% by weight, the alkylphenol ethoxylate content was 40% by weight, and the ...

Embodiment 3

[0030] This example is used to illustrate the magnesium alloy surface activation composition and its preparation method provided by the present invention.

[0031] 1.8 grams of nitric acid, 2 grams of citric acid, 0.1 gram of ethylenediaminetetramethylenephosphonic acid (Shandong Taihe Chemical Plant, EDTMP), 1 gram of thiourea, and 5 grams of fatty alcohol ether phosphate (Jiangsu Haian Petrochemical Plant, MOA -3P) and 0.1 gram of sodium metavanadate are mixed to obtain the composition S3 for activating the surface of magnesium alloy provided by the present invention.

[0032]Based on the total amount of the composition, the content of nitric acid is 18% by weight, the content of citric acid is 20% by weight, the content of ethylenediaminetetramethylenephosphonic acid is 1% by weight, and the content of thiourea is 10% by weight , the content of fatty alcohol ether phosphate is 50% by weight, and the content of iron nitrate is 1% by weight.

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PUM

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Abstract

The invention discloses a complex for magnesium alloy surface activation. The complex comprises inorganic acid, organic phosphonic acid, surfactant and oxidizer, and is characterized in that: the complex also comprises organic carboxylic acid and corrosion-inhibition agent. The complex for magnesium alloy surface activation provided by the invention can ensure that the residue on the surface of the magnesium alloy is completely cleaned; at the same time, the complex can not cause remarkable corrosion effect to the magnesium alloy, has more lasting activation effect; the activated magnesium alloy has smooth and luminant surface, and has no influence on the size accuracy of workpieces. And the complex provided by the invention does not contain the substances harmful to the human body and the environment such as Cr, F and so on, and has no pollution to the human body and the environment.

Description

technical field [0001] The invention relates to a composition for activating the surface of an alloy, in particular to a composition for activating the surface of a magnesium alloy. Background technique [0002] Magnesium alloys have been widely used due to their excellent properties. However, magnesium is an extremely active metal, the standard electrode potential is -2.36 volts, and its corrosion resistance in air is extremely poor, so magnesium alloy materials must be properly surface treated according to specific requirements before use. In the production cost of magnesium alloy materials, surface treatment accounts for a large proportion, so surface treatment is very important to the production and application of magnesium alloys. [0003] CN 1641075A discloses a surface activation treatment method for magnesium and magnesium alloys. The method includes first removing the oxide film and the passivation film of basic carbonate on the surface of the workpiece with a stro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/06C23G1/02C23G1/12C23G1/04C23G1/06
Inventor 乔林军
Owner 南通江海港建设工程有限公司
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