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Composite passivation solution and preparation method thereof

A technology of passivation solution and solution, which is applied in the field of metal anti-corrosion, can solve problems such as unsatisfactory substrate adhesion, insufficient performance advantages, complex production process, etc., to ensure the feasibility of preparation, avoid hidden dangers of cancer, and simple operation steps Effect

Pending Publication Date: 2021-07-20
CHANGZHOU VOCATIONAL INST OF ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inorganic passivation solutions currently used in industrial production are mainly phosphates, silicates, nitrates, etc. Compared with chromate passivation solutions, the cost is high, the production process is complicated, and the performance advantages are insufficient; pure organic Passivation solutions such as phytic acid, silane, resin, etc. have low corrosion resistance and poor adhesion to the substrate. They are often used as additives to other main films to improve the corrosion resistance and density of the passivation film; organic-inorganic composite passivation The chemical solution often results in uneven film formation and poor compactness due to poor compatibility between the two

Method used

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  • Composite passivation solution and preparation method thereof

Examples

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Embodiment 1

[0020] A composite passivation solution comprising the following components by weight: 0.5 parts of graphene oxide, 20 parts of cobalt salt, 8 parts of chelating agent, 30 parts of polar solvent, 10 parts of organic volatile solvent, and the cobalt salt contains Co 2+ A water-soluble inorganic salt of ions, and the pH of the composite passivation solution is 2.

[0021] The preferred technical solution is that the chelating agent is ethylenediaminetetraacetic acid; the polar solvent is a mixed solution of distilled water and absolute ethanol, wherein the mass ratio of the two is 1:4; the organic volatile The neutral solvent is absolute ethanol; the cobalt salt is Co(NO 3 ) 2 ·7H 2 O.

[0022] The preparation method of above-mentioned a kind of composite passivation solution, comprises the following steps:

[0023] S1: Mix distilled water and absolute ethanol according to the mass ratio of 1:4, and adjust the pH to 3-4 with sulfuric acid to obtain a polar solvent;

[0024]...

Embodiment 2

[0028] A composite passivation solution, comprising the following components by weight: 1.5 parts of graphene oxide, 15 parts of cobalt salt, 5 parts of chelating agent, 45 parts of polar solvent, 20 parts of organic volatile solvent, and the cobalt salt contains Co 2+ A water-soluble inorganic salt of ions, and the pH of the composite passivation solution is 3.

[0029] The preparation method of the composite passivation solution in Example 2 is the same as that in Example 1.

Embodiment 3

[0031] A composite passivation solution, comprising the following components by weight: 2 parts of graphene oxide, 10 parts of cobalt salt, 2 parts of chelating agent, 70 parts of polar solvent, 30 parts of organic volatile solvent, and the cobalt salt contains Co 2+ The water-soluble inorganic salt of ion, the pH of described composite passivation solution is 4.

[0032] The preparation method of the composite passivation solution in Example 3 is the same as that in Example 1.

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Abstract

The invention discloses a composite passivation solution and a preparation method thereof. The composite passivation solution does not contain chromium ions, so that heavy metals are prevented from causing carcinogenic hidden dangers to human bodies and harm to the ecological environment. In an anti-corrosion film formed by passivating the surface of a metal product through the composite passivation solution, the laminar graphene oxide can enhance the physical shielding performance of the anti-corrosion film on a corrosion medium; by adding the cobalt salt, the current inhibition capability of the anti-corrosion film can be enhanced; and ethylene diamine tetraacetic acid (EDTA for short) can be complexed and coordinated with metal ions to form a complex compound with an annular structure on one hand, and can also form a non-covalent bond with hydroxyl on the surface of graphene oxide on the other hand, so that the binding force between the anti-corrosion film and a metal substrate is improved. The preparation method of the composite passivation solution is simple in operation steps, and the feasibility of preparation and implementation of the composite passivation solution is ensured.

Description

technical field [0001] The invention relates to the technical field of metal corrosion protection, in particular to a composite passivation solution and a preparation method thereof. Background technique [0002] With the rapid development of society and economy, metal materials such as steel and aluminum are widely used, but the problem of metal corrosion has brought huge losses to the national economy. For example, 30% of steel is wasted due to corrosion in the process of utilization. The total cost of steel corrosion in my country exceeds 2.1 trillion yuan, accounting for about 3.34% of GDP in that year. At the same time, metal corrosion is also one of the important factors affecting the safety and service life of equipment and facilities in the fields of emerging ocean engineering and island engineering. and equipment sustainability are affected. Due to the lightweight requirements of automobiles, aluminum aluminum castings are widely used in automobile manufacturing, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/02C23C22/48
CPCC23C22/02C23C22/48
Inventor 陶宇邵为吕春霞魏宇航
Owner CHANGZHOU VOCATIONAL INST OF ENG
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