Metal surface passivating treatment fluid

A passivation treatment, metal surface technology, applied in the direction of metal material coating process, etc., can solve the problems of large environmental pollution, limited use of chromate, high toxicity, and achieve the effect of simple and practical formula

Inactive Publication Date: 2014-10-08
ANHUI TONGRUN AUTO ACCESSORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical conversion coating process on the surface of aluminum alloy can be roughly divided into two types: one is chromate passivation treatment, and the other is non-chromate passivation treatment. Although chromate passivation treatment has many advantages However, due to the high toxicity of (Cr), carcinogenicity, and great environmental pollution, many countries have strictly restricted the use and discharge of chromate, and with the entry into force of EU directives, the use of chromate in metal surface treatment has been extremely restricted. big limit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A metal surface passivation treatment liquid, comprising the following mass percentage components: including the following mass percentage components: magnesium fluoride 80g / l, sodium tripolyphosphate 5g / l, sodium fluorosilicate 20g / l, hydrochloric acid 40g / l , nitric acid 30g / l, phosphoric acid 80g / l, sulfuric acid 3g / l, calcium nitrate 16g / l, and the balance is water.

[0012] The beneficial effects of the present invention are: the formula of the present invention is simple and practical, free of chromate, safe, environmentally friendly and pollution-free, and forms an adsorption layer of oxygen or oxygen-containing particles when interacting with the metal surface. , Change the interface structure between the metal and the solution, increase the activation energy of the electrode reaction, and passivate the metal surface reaction ability.

Embodiment 2

[0014] A metal surface passivation treatment liquid, comprising the following mass percentage components: including the following mass percentage components: magnesium fluoride 120g / l, sodium tripolyphosphate 7g / l, sodium fluorosilicate 30g / l, hydrochloric acid 50g / l , nitric acid 40g / l, phosphoric acid 120g / l, sulfuric acid 4g / l, calcium nitrate 22g / l, and the balance is water.

[0015] The beneficial effects of the present invention are: the formula of the present invention is simple and practical, free of chromate, safe, environmentally friendly and pollution-free, and forms an adsorption layer of oxygen or oxygen-containing particles when interacting with the metal surface. , Change the interface structure between the metal and the solution, increase the activation energy of the electrode reaction, and passivate the metal surface reaction ability.

Embodiment 3

[0017] A metal surface passivation treatment liquid, comprising the following mass percentage components: including the following mass percentage components: magnesium fluoride 100g / l, sodium tripolyphosphate 6g / l, sodium fluorosilicate 25g / l, hydrochloric acid 45g / l , nitric acid 35g / l, phosphoric acid 100g / l, sulfuric acid 3.5g / l, calcium nitrate 19g / l, and the balance is water.

[0018] The beneficial effects of the present invention are: the formula of the present invention is simple and practical, free of chromate, safe, environmentally friendly and pollution-free, and forms an adsorption layer of oxygen or oxygen-containing particles when interacting with the metal surface. , Change the interface structure between the metal and the solution, increase the activation energy of the electrode reaction, and passivate the metal surface reaction ability.

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PUM

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Abstract

The invention discloses a metal surface passivating treatment fluid which is characterized by comprising the following components in percentage by mass: 80-120g/l of magnesium fluoride, 5-7g/l of sodium tripolyphosphate, 20-30g/l of sodium fluosilicate, 40-50g/l of hydrochloric acid, 30-40g/l of nitric acid, 80-120g/l of phosphoric acid, 3-4g/l of sulfuric acid, 16-22g/l of calcium nitrate and the balance of water. The metal surface passivating treatment fluid disclosed by the invention is simple and practical in formula and safe, environment-friendly and pollution-free by containing no chromate, forms an oxygen or oxygen-containing particle absorption layer when reacted with a metal surface and achieves the passivation by enhancing the activation energy of electrode reaction and reducing the reaction capacity of the metal surface by changing the interface structure of metal and a solution due to the absorption of oxygen on the metal surface.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a metal surface passivation treatment liquid. Background technique [0002] An active metal or alloy in which the chemical activity is greatly reduced and becomes a noble metal state is called passivation. If the corrosion product generated by the metal due to the action of the medium has a dense structure, a thin film (often invisible) is formed and tightly covered on the surface of the metal, which changes the surface state of the metal and greatly increases the electrode potential of the metal. The positive direction jumps and becomes a passive state of corrosion resistance. For example, when Fe→Fe++, the standard potential is -0.44V, and it jumps to +0.5-1V after passivation, which shows the performance of corrosion-resistant noble metals. This layer of film is called passivation film. The chemical conversion coating process on the surface of aluminum alloy can be rou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/36
Inventor 韦秋林
Owner ANHUI TONGRUN AUTO ACCESSORY
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