A kind of passivation solution for railway vehicle stainless steel car body and preparation method thereof

A railway vehicle and passivation solution technology, which is applied in the coating process of metal materials, can solve the problems of poor corrosion resistance and achieve the effects of improving compatibility, prolonging the diffusion path, and improving adsorption

Active Publication Date: 2022-03-11
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the object of the present invention is to provide a passivation solution for the stainless steel car body of railway vehicles and a preparation method thereof, so as to solve the technical problem of poor corrosion resistance of the existing passivation solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method for a passivation solution for a stainless steel body of a railway vehicle, comprising the steps of:

[0030] (1) Preparation of hydroxylated boron nitride: Add 10g of hexagonal boron nitride to 200mL, 6mol / L sodium hydroxide solution, stir and react in an oil bath at 120°C for 8h, and perform surface hydroxylation reaction. , washing and drying the reaction product to obtain hydroxylated boron nitride;

[0031] (2) Preparation of amino-modified boron nitride: ultrasonically disperse 10g of hydroxylated boron nitride in 200mL of deionized water, adjust the pH of the solution to 3, then add 6g of polyamidoamine and 4g of epichlorohydrin to it, mix Evenly, react at 60°C for 3 hours. After the reaction is completed, the reaction product is washed and dried to obtain amino-modified boron nitride;

[0032] (3) Preparation of montmorillonite modified by titanate coupling agent: add 10g montmorillonite to 100g, 25wt% acetic acid solution, stir evenly, the...

Embodiment 2

[0035] A preparation method for a passivation solution for a stainless steel body of a railway vehicle, comprising the steps of:

[0036] (1) Preparation of hydroxylated boron nitride: Add 10g of hexagonal boron nitride into 200mL, 8mol / L sodium hydroxide solution, stir and react in an oil bath at 140°C for 10h, and perform surface hydroxylation reaction. , washing and drying the reaction product to obtain hydroxylated boron nitride;

[0037] (2) Preparation of amino-modified boron nitride: ultrasonically disperse 10g of hydroxylated boron nitride in 200mL of deionized water, adjust the pH of the solution to 3, then add 8g of polyamidoamine and 4g of epichlorohydrin to it, mix Evenly, react at 80°C for 4 hours. After the reaction is completed, the reaction product is washed and dried to obtain amino-modified boron nitride;

[0038] (3) Preparation of montmorillonite modified by titanate coupling agent: add 10g montmorillonite to 100g, 25wt% acetic acid solution, stir evenly, ...

Embodiment 3

[0041] A preparation method for a passivation solution for a stainless steel body of a railway vehicle, comprising the steps of:

[0042] (1) Preparation of hydroxylated boron nitride: Add 10g of hexagonal boron nitride to 200mL, 8mol / L sodium hydroxide solution, stir and react in an oil bath at 150°C for 12h, and perform surface hydroxylation reaction. , washing and drying the reaction product to obtain hydroxylated boron nitride;

[0043](2) Preparation of amino-modified boron nitride: ultrasonically disperse 10g of hydroxylated boron nitride in 200mL of deionized water, adjust the pH of the solution to 4, then add 9g of polyamidoamine and 6g of epichlorohydrin to it, mix Evenly, react at 80°C for 4 hours. After the reaction is completed, the reaction product is washed and dried to obtain amino-modified boron nitride;

[0044] (3) Preparation of montmorillonite modified by titanate coupling agent: add 10g montmorillonite to 100g, 30wt% acetic acid solution, stir evenly, the...

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Abstract

The invention discloses a passivation solution for a stainless steel body of a railway vehicle and a preparation method thereof, including the preparation of hydroxylated boron nitride, the preparation of amino-modified boron nitride, and the modification of montmorillonite by a titanate coupling agent The preparation of soil and the preparation of passivation solution have four steps. In the present invention, hexagonal boron nitride is first hydroxylated and modified, and then polyamidoamine is introduced by grafting. The dendritic structure of polyamidoamine can enhance the physical properties of boron nitride. The shielding effect protects the metal substrate and improves the anti-corrosion performance of the passivation solution by prolonging the diffusion path of the corrosive medium. The synergistic effect jointly enhances the steric barrier effect, retards the diffusion of corrosive substances, and further improves the anti-corrosion performance of the metal substrate.

Description

technical field [0001] The invention relates to the technical field of metal material surface treatment, in particular to a passivation solution for a stainless steel car body of a railway vehicle and a preparation method thereof. Background technique [0002] In the production of stainless steel car bodies of railway vehicles, many parts of the car body need to undergo welding, fire repair and other processes, and are produced and operated for a long time in a humid atmospheric environment. The above parts are prone to corrosion. In order to meet the aesthetic requirements of the stainless steel car body surface Requirements, the need for passivation of the above areas. [0003] At present, the traditional method of stainless steel surface passivation treatment mainly uses acid chromate as passivation solution for passivation treatment. This method has the advantages of good film quality and simple process. However, the inorganic passivation solution used in industrial pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/50
CPCC23C22/50
Inventor 艾佳陈作炳何安琪龚炼炼白有林高胜利赵富中朱雷
Owner WUHAN UNIV OF TECH
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