Passivation solution for stainless steel body of railway vehicle and preparation method therefor

A railway vehicle and passivation solution technology, which is applied in the coating process of metal materials, etc., can solve problems such as poor corrosion resistance, and achieve the effects of improving compatibility, slowing contact, and enhancing space barrier effect

Active Publication Date: 2021-12-21
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 method of preparing liquid passivating stainless steel body for a railway vehicle, comprising the steps of:

[0030] Preparation of hydroxylated boron nitride (1): 10g of hexagonal boron nitride was added to 200mL, 6mol / L sodium hydroxide solution, stirred at 120 deg.] C oil bath under a reaction 8h, surface hydroxylation reaction, after completion of the reaction , the reaction product was washed and dried to obtain hydroxylated boron;

[0031] Preparation of amino-modified boron nitride (2): 10g of boron hydroxylated ultrasonic dispersion in 200mL deionized water, adjusting the pH of the solution was 3, and then thereto was added 6g 4g polyamidoamine and epichlorohydrin, mixed uniformly, at 60 deg.] C reaction 3h, after the completion of the reaction, the reaction product was washed and dried to obtain an amino-modified boron nitride;

[0032] (3) Preparation of titanate coupling agent is modified montmorillonite: 10g of montmorillonite added to 100g, 25wt% acetic aci...

Embodiment 2

[0035] A method of preparing liquid passivating stainless steel body for a railway vehicle, comprising the steps of:

[0036] Preparation of hydroxylated boron nitride (1): 10g of hexagonal boron nitride was added to 200mL, 8mol / L sodium hydroxide solution, an oil bath at 140 deg.] C the reaction was stirred 10H, surface hydroxylation reaction, after completion of the reaction , the reaction product was washed and dried to obtain hydroxylated boron;

[0037] Preparation of amino-modified boron nitride (2): 10g of boron hydroxylated ultrasonic dispersion in 200mL deionized water, adjusting the pH of the solution is 3, then adding 4g 8g polyamidoamine and epichlorohydrin, mixed uniform, reacted at 80 ℃ 4h, after the completion of the reaction, the reaction product was washed and dried to obtain an amino-modified boron nitride;

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

Embodiment 3

[0041] A method of preparing liquid passivating stainless steel body for a railway vehicle, comprising the steps of:

[0042] Preparation of hydroxylated boron nitride (1): 10g of hexagonal boron nitride was added to 200mL, 8mol / L sodium hydroxide solution, an oil bath at 150 deg.] C the reaction was stirred 12h, surface hydroxylation reaction, after completion of the reaction , the reaction product was washed and dried to obtain hydroxylated boron;

[0043]Preparation of amino-modified boron nitride (2): pH hydroxylated 10g of boron in an ultrasonic dispersion 200mL deionized water, the solution was adjusted to 4, and then thereto was added 6g 9g polyamidoamine and epichlorohydrin, mixed uniform, reacted at 80 ℃ 4h, after the completion of the reaction, the reaction product was washed and dried to obtain an amino-modified boron nitride;

[0044] (3) Preparation of titanate coupling agent is modified montmorillonite: 10g of montmorillonite added to 100g, 30wt% acetic acid soluti...

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Abstract

The invention discloses a passivation solution for a stainless steel body of a railway vehicle and a preparation method therefor. The preparation method comprises four steps of preparation of hydroxylated boron nitride, preparation of amino modified boron nitride, preparation of titanate coupling agent modified montmorillonite, and preparation of the passivation solution. According to the invention, hexagonal boron nitride is modified by hydroxylation, then polyamidoamine is introduced through grafting; the dendritic structure of the polyamidoamine can enhance the physical shielding effect of boron nitride; the metal substrate is protected by prolonging the diffusion path of a corrosive medium, and the corrosion resistance of the passivation solution is improved; the polyamidoamine with the dendritic structure and montmorillonite with a layered structure are introduced, and the two structures cooperate with each other, so that the space barrier effect is enhanced together, diffusion of corrosive substances is retarded, and the anti-corrosion performance of a metal substrate is further improved.

Description

Technical field [0001] The present invention relates to a metal surface treatment technologies, and particularly relates to a process for the passivation and preparation for the stainless steel body of a railway vehicle. Background technique [0002] Railway vehicle body in stainless steel production, many parts of the body to go through welding, repair and other processes under fire adjustment, and long production runs in a humid atmosphere, these parts prone to corrosion, in order to meet the surface appearance of the stainless steel body requirements, the need for a passivation process on the region. [0003] Currently conventional stainless steel surface passivation methods used mainly as an acidic chromate passivating solution passivation, the method has excellent film quality, simple process, etc. However, because of its carcinogenic hexavalent chromium ions and environmental pollution, has use is limited, however, the inorganic passivation solution currently used in indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/50
CPCC23C22/50
Inventor 艾佳陈作炳朱雷
Owner WUHAN UNIV OF TECH
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