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
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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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