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Rare earth chromate-free passivation liquid for coating treatment of material and application of rare earth chromate-free passivation liquid

A technology of chromium-free passivation and passivation solution, which is applied in the coating process of metal materials, etc., can solve the problems of long passivation time and achieve the effects of refining crystal grains, improving corrosion resistance, and improving corrosion resistance

Inactive Publication Date: 2013-08-21
XINHUI LUOKENG POWER LINE EQUIP & FITTING PLANT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using a single cerium salt solution to treat galvanized parts, a passivation film was obtained, and the research found that it has a good anti-corrosion effect on zinc parts, but the passivation time of this method is too long

Method used

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  • Rare earth chromate-free passivation liquid for coating treatment of material and application of rare earth chromate-free passivation liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A rare earth chromium-free passivation solution used for material coating treatment, its components are: boric acid, hydrogen peroxide, cerium chloride, phytic acid, water; in the passivation solution, boric acid: H 2 o 2 : Ce 3+ : Phytic acid: The molar ratio of water is 1:24.5:1.66:0.62:1722.

[0023] A surface treatment process for galvanized metal materials, comprising the following steps:

[0024] 1) Soak the galvanized steel sheet in the above-mentioned rare earth chromium-free passivation solution, and passivate it for 5 minutes at a constant temperature of 25°C.

[0025] 2) Wash the passivated galvanized steel sheet with water, and then let it stand until the passivation film ages.

Embodiment 2

[0027] A rare earth chromium-free passivation solution used for material coating treatment, its components are: boric acid, hydrogen peroxide, cerium chloride, phytic acid, water; in the passivation solution, boric acid: H 2 o 2 : Ce 3+ : Phytic acid: The molar ratio of water is 1:24.5:1.66:62:1722.

[0028] A surface treatment process for galvanized metal materials, comprising the following steps:

[0029] 1) Soak the galvanized steel sheet in the above-mentioned rare earth chromium-free passivation solution, and passivate it for 2 minutes at a constant temperature of 30°C;

[0030] 2) Wash the passivated galvanized steel sheet with water, and then let it stand until the passivation film ages.

Embodiment 3

[0032] A rare earth chromium-free passivation solution used for material coating treatment, its components are: boric acid, hydrogen peroxide, cerium chloride, phytic acid, water; in the passivation solution, boric acid: H 2 o 2 : Ce 3+ : Phytic acid: The molar ratio of water is 1:24.5:1.66:0.62:17220.

[0033] A surface treatment process for galvanized metal materials, comprising the following steps:

[0034] 1) Soak the galvanized steel sheet in the above-mentioned rare earth chromium-free passivation solution, and passivate it for 1 minute at a constant temperature of 50°C;

[0035] 2) Wash the passivated galvanized steel sheet with water, and then let it stand until the passivation film ages.

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Abstract

The invention discloses a rare earth chromate-free passivation liquid for coating treatment of a material and an application of the rare earth chromate-free passivation liquid. The passivation liquid comprises the following components: boric acid, hydrogen peroxide, tervalent cerate, phytic acid and water, wherein a molar ratio of the boric acid, to H2O2 to Ce<3+> to the phytic acid to water in the passivation liquid is (1-50):(24.5-245):(1.66-83.2):(0.62-62):(1722-17220). The passivation liquid is used for surface treatment of a galvanized metal plate. According to the galvanized salt mist resisting passivation liquid used for surface treatment of the galvanized metal plate, the galvanized metal plate has the salt mist resistance, and the corrosive resistance is further remarkably improved. The experiments show that the anti-corrosion time of the treated galvanized metal plate to a lead acetate solution is raised from average 31 seconds before passivation to 35-360 seconds, and the salt mist resisting time of the treated galvanized metal plate is raised from average 6 hours before passivation to 6-180 hours.

Description

technical field [0001] The invention relates to a rare earth chromium-free passivation solution for material coating treatment and its application, in particular to a green and environment-friendly rare earth / H 2 o 2 / Phytic acid compound passivation solution and its application. Background technique [0002] Galvanizing is an effective method commonly used to improve the corrosion resistance of metal materials, but in a humid environment, the exposed galvanized layer is easily corroded to form loose white rust. Due to the active chemical properties of zinc, it is easy to be corroded in airtight or poorly ventilated and humid air conditions. Usually, metal passivation treatment is carried out on the outer surface of galvanized parts to further improve its service life. The traditional hexavalent chromate passivation solution has been widely used because of its stable performance, low cost, convenient use, good corrosion resistance, and simple passivation process. However...

Claims

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Application Information

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IPC IPC(8): C23C22/53
Inventor 潘春阳黎毓慈
Owner XINHUI LUOKENG POWER LINE EQUIP & FITTING PLANT CO LTD
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