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A kind of metal manganese chromium-free passivator and its preparation method and application

A chromium-free passivator and metal manganese technology, applied in the field of metallurgy, can solve the problems of increased silicon content, non-self-healing, and reduced quality of electrolytic metal manganese products, and achieve slow hydrolysis, good environmental compatibility, and good biological degradability effect

Active Publication Date: 2019-11-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The damp heat resistance of the product passivated by this passivator is similar to that of the product passivated by potassium dichromate, but the increase in silicon content in the product will reduce the quality of the electrolytic metal manganese product to a certain extent
To sum up, the existing chromium-free passivator products have more or less disadvantages such as phosphorus pollution, unstable passivation solution, poor product quality, and no self-healing property. Therefore, it is urgent to develop new environmentally friendly passivators with excellent performance. Chromium-free passivator products

Method used

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  • A kind of metal manganese chromium-free passivator and its preparation method and application
  • A kind of metal manganese chromium-free passivator and its preparation method and application
  • A kind of metal manganese chromium-free passivator and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] First, an electrolytic manganese product is prepared in a diaphragm tank by electrolysis: stainless steel is used as a cathode plate, and a lead-silver alloy plate is used as an anode plate. Electrolysis conditions: ammonium sulfate 120g / L, manganese sulfate 35.67g / L, selenium dioxide 0.05g / L catholyte, catholyte pH is about 6.8~7.0, current density is 330A / m 2 , the electrolysis temperature was 38°C, and the electrolysis time was 1.5h. The prepared electrolytic manganese product was used for subsequent passivation experiments and performance evaluation of the passivation layer.

[0043] Preparation of passivation solution: Add 2g of stearic acid, 6g of sodium methyl stearate sulfonate, 2.5g of cerium nitrate and 2.5g of 2-morpholineethanesulfonic acid into 350mL of water, heat and stir at 80°C to dissolve, Then add 7 mL of 30% H 2 o 2 Stir for 1 minute, adjust to pH = 6.0, and prepare a chromium-free passivation solution (mass concentration is about 3%) for electroly...

Embodiment 2

[0061] The preparation of the electrolytic manganese metal product is the same as in Example 1.

[0062] Preparation of passivation solution: 2g of stearic acid, 2g of sodium stearate methyl sulfonate, 4.5g of cerium nitrate and 3.5g of 2-morpholineethanesulfonic acid were added to 350mL of water, followed by 15mL of 30% h 2 o 2 Stir for 1 minute, heat and stir to dissolve at 80° C., adjust to pH=6.0, and prepare a chromium-free passivation solution for electrolytic metal manganese surface treatment. The mass ratio of stearic acid, sodium methyl stearate sulfonate, cerium nitrate and 2-morpholineethanesulfonic acid in the passivator is 1:1:2.25:1.75.

[0063] Passivation and performance testing of electrolytic manganese products: Put the chromium-free passivation solution in the passivation tank, rinse the surface of the cathode plate after electrolysis with clean water, then put the cathode plate into the passivation tank, and immerse the chromium-free passivation solution ...

Embodiment 3

[0066] The preparation of electrolytic manganese metal is the same as in Example 1.

[0067] Preparation of the mixture of stearic acid and sodium stearate methyl sulfonate: Weigh 30g of stearic acid and 20mL of methanol into a 250mL four-neck flask, add 1mL of concentrated sulfuric acid, stir and reflux at 80°C for 20h, stop the reaction , wash the product with hot water at 60°C for 3 times, adjust the pH to 7.5 with sodium hydroxide, and cool to obtain the intermediate esterification product; put the esterification product, 12mL of chloroform and 2g of sodium sulfate in a four-necked flask, and heat to 35-40 ℃, and control the temperature below 50℃, add 7g of chlorosulfonic acid dropwise, then slowly raise the temperature to 70℃, stir for 1h, cool to obtain the sulfonated product; control the temperature at 40~50℃, neutralize the sulfonic acid with 20% NaOH The product was oxidized to control its pH to about 8, and then 20 mL of H was added 2 o 2 (mass fraction is 30%) to ...

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Abstract

The invention discloses a metal manganese chromium-free passivator and a preparation method and application thereof. The metal manganese chromium-free passivator comprises straight-chain hydrophobic fatty acid, straight-chain fatty acid methyl ester sulfonate, soluble cerium salt and 2-morpholino ethanesulfonic acid monohydrate compound. The mass ratio of the straight-chain hydrophobic fatty acid,the straight-chain fatty acid methyl ester sulfonate, the soluble cerium salt and the 2-morpholino ethanesulfonic acid monohydrate compound is 1: (1-6): (0.1-8): (0.5-5). The metal manganese chromium-free passivator is good in passivation effect, environment-friendly, good in stability and capable of self-repairing, and can be used for passivating of metal manganese products. The passivating agent can be prepared by directly mixing all components in proportion, or can be prepared by firstly carrying out esterification, sulfonation, neutralization and bleaching in sequence on excess straight-chain hydrophobic fatty acid, forming a mixture of fatty acid or fatty acid salt and fatty acid methyl ester sulfonate, and then adding the soluble cerium salt and the 2-morpholino ethanesulfonic acidmonohydrate compound.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a chromium-free passivator for metal manganese and its preparation method and application. Background technique [0002] Manganese is one of the basic raw materials for the steel industry. "Without manganese, there is no steel." Manganese can significantly improve the mechanical properties of steel, increase the strength, hardness and ductility of steel, and is an indispensable alloying element for steel production. In recent years, my country's manganese industry has developed strongly with the rapid growth of steel production. The output of manganese ore, manganese alloy and electrolytic manganese has ranked first in the world, of which the output of electrolytic manganese has reached 1.307 million tons, accounting for 98.3% of the world's total output . However, due to the low chemical potential and high activity of manganese metal, it is easy to react with oxygen in the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/58C23C22/68
CPCC23C22/58C23C22/68
Inventor 曹占芳逯菲钟宏王帅刘广义
Owner CENT SOUTH UNIV
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