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Inorganic acid passivation solution used for electro-galvanized coating

A technology of inorganic acid and passivation solution, applied in the direction of metal material coating process, can solve the problems of high chromate toxicity, insufficient anti-corrosion performance, environmental pollution, etc., achieve good processing quality, good environmental protection effect, and improve the surface layer. quality effect

Inactive Publication Date: 2017-12-29
ANHUI TENGLONG PUMP VALVE MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chromate passivation treatment is usually carried out, but due to the high toxicity and carcinogenicity of chromate, which will pollute the environment, it has been increasingly restricted by environmental protection regulations; for many years people have been looking for more ecologically demanding compounds , to replace chromate for passivation treatment of zinc coating
Among them, the protection of inorganic substances is one of the directions that those skilled in the art focus on, but there are problems such as loose film layer, insufficient anti-corrosion performance, long time, and poor color. Therefore, a kind of chromium that can effectively replace the traditional Salt passivation solution is one of the problems that those skilled in the art need to solve urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A kind of inorganic acid passivation solution for electroplating zinc layer, is made up of the following material of parts by weight:

[0015] 25 parts of molybdate, 15 parts of tungstate, 10 parts of silicate, 6 parts of hydrogen peroxide, 5 parts of auxiliary agent, 800 parts of water; the auxiliary agent is composed of the following parts by weight: 3 parts of phthalic anhydride , 4 parts of triethylenediamine, 15 parts of acrylic resin, 3 parts of diethylene glycol monobutyl ether, 5 parts of hydroxyethylidene diphosphonic acid, 2 parts of cerous nitrate, 4 parts of epoxy triethoxysilane.

[0016] Further, the molybdate is composed of sodium molybdate and potassium molybdate.

[0017] Further, the tungstate is composed of sodium tungstate, cobalt tungstate and ferrous tungstate.

[0018] Further, the silicate is composed of sodium silicate and potassium silicate.

[0019] Further, the pH value of the inorganic acid passivation solution is 2-3.

Embodiment 2

[0021] A kind of inorganic acid passivation solution for electroplating zinc layer, is made up of the following material of parts by weight:

[0022] 28 parts of molybdate, 17 parts of tungstate, 12 parts of silicate, 10 parts of hydrogen peroxide, 6 parts of auxiliary agent, 900 parts of water; the auxiliary agent is composed of the following parts by weight: 4 parts of phthalic anhydride , 6 parts of triethylenediamine, 17 parts of acrylic resin, 5 parts of diethylene glycol monobutyl ether, 7 parts of hydroxyethylidene diphosphonic acid, 3 parts of cerous nitrate, 6 parts of epoxy triethoxysilane.

[0023] Further, the molybdate is composed of sodium molybdate, potassium molybdate and calcium molybdate.

[0024] Further, the tungstate is composed of sodium tungstate, cobalt tungstate and ferrous tungstate.

[0025] Further, the silicate is composed of sodium silicate, potassium silicate and magnesium silicate.

[0026] Further, the pH value of the inorganic acid passivati...

Embodiment 3

[0028] A kind of inorganic acid passivation solution for electroplating zinc layer, is made up of the following material of parts by weight:

[0029] 30 parts of molybdate, 20 parts of tungstate, 15 parts of silicate, 12 parts of hydrogen peroxide, 8 parts of auxiliary agent, 1000 parts of water; the auxiliary agent is composed of the following parts by weight: 5 parts of phthalic anhydride , 7 parts of triethylenediamine, 18 parts of acrylic resin, 6 parts of diethylene glycol monobutyl ether, 8 parts of hydroxyethylidene diphosphonic acid, 4 parts of cerous nitrate, and 8 parts of epoxy triethoxysilane.

[0030] Further, the molybdate is sodium molybdate.

[0031] Further, the tungstate is ferrous tungstate.

[0032] Further, the silicate is potassium silicate.

[0033] Further, the pH value of the inorganic acid passivation solution is 2-3.

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PUM

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Abstract

The invention discloses an inorganic acid passivation solution used for an electro-galvanized coating and relates to the technical field of metal surface treatment. The inorganic acid passivation solution is composed of the following substances of molybdate, tungstate, silicate, hydrogen peroxide, addition agents and water. The prepared passivation solution has the characteristics of being environmentally friendly, safe, free of pollution, good in processing quality and high in manufacturing efficiency and extremely has popularization value.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to an inorganic acid passivation solution used for electroplating zinc layers. Background technique [0002] Zinc is an important non-ferrous metal. Electrogalvanizing is an effective way to improve the corrosion resistance of steel. It is currently widely used in aviation, transportation, electric power, ships, machinery and other fields. In the processing and manufacturing of pumps, most of the components such as the shell, flange, base, and reinforcing ribs are made of steel, and are usually treated with electro-galvanized protection. Zinc has a low corrosion rate in a dry and clean atmosphere, but it is easy to corrode when used in a humid environment. Therefore, the galvanized layer needs to be passivated. Chromate passivation treatment is usually carried out, but due to the high toxicity and carcinogenicity of chromate, which will pollute the environment, it h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/40C25D5/48
CPCC23C22/40C25D5/48
Inventor 徐向远
Owner ANHUI TENGLONG PUMP VALVE MFG CO LTD
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