Chromium-free passivator as well as preparation method and application thereof

A chromium-free passivation agent and scheme technology, applied in the coating process of metal materials, etc., can solve the problems of phosphorus pollution, increased silicon content, unstable passivation solution, etc., and achieve less side reactions, improved passivation performance, and corrosion resistance. The effect of current reduction

Active Publication Date: 2017-01-04
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 passivation agent 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 chromium-free passivators. Passivator Products

Method used

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  • Chromium-free passivator as well as preparation method and application thereof
  • Chromium-free passivator as well as preparation method and application thereof
  • Chromium-free passivator as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] First, the electrolytic manganese is prepared in a diaphragm tank by electrolysis: stainless steel is used as the cathode plate, and a lead-silver alloy plate is used as the anode plate. Electrolysis conditions: ammonium sulfate 120g / L, manganese sulfate 36.91g / L, selenium dioxide 0.05g / L catholyte, catholyte pH is about 6.8~7.0, current density is 350A / 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.

[0049] The percentage by weight of each component of the passivator is: stearic acid 16.4%, stearic acid diethanolamide 81.9%, ascorbic acid 1.7%. Stearic acid, stearic acid diethanolamide and water are heated and stirred at 80° C. to dissolve first, and then ascorbic acid is added to stir and dissolve to obtain a chromium-free passivation solution (concentration: 3%) for surface treatment of elec...

Embodiment 2

[0079] The preparation of electrolytic manganese metal is the same as in Example 1.

[0080] The percentage by weight of each component of the passivator is: 16% of lauric acid, 82.4% of oleic acid diethanolamide, and 1.6% of ethylenediaminetetraacetic acid. First, lauric acid, oleic acid diethanolamide and water were heated and stirred at 80° C. to dissolve, and then ethylenediaminetetraacetic acid was added to obtain a chromium-free passivation solution (concentration: 3%) for surface treatment of electrolytic manganese metal. The passivation agent was used to conduct passivation and electrochemical performance tests on electrolytic manganese, and the polarization curve results are shown in Table 5.

[0081] Table 5 lauric acid and other passivation polarization curve results

[0082] E. corr (V) i corr (Acm-2) R(ohm) Corrosion rate (mil / year) Not passivated -1.178 9.01E-05 377 4.75E+02 After passivation -0.950 7.475E-07 20116 3.946E+00...

Embodiment 3

[0085] The preparation of electrolytic manganese metal is the same as in Example 1.

[0086] The percentage by weight of each component of the passivator is: 16% of palmitic acid, 82.4% of stearic acid diethanolamide, and 1.6% of triethanolamine. Palmitic acid, stearic acid diethanolamide and water were first heated and stirred at 80° C. to dissolve, and then triethanolamine was added to obtain a chromium-free passivation solution (concentration: 3%) for surface treatment of electrolytic manganese metal. The passivation solution was used to conduct passivation and electrochemical performance tests on electrolytic manganese, and the polarization curve results are shown in Table 6.

[0087] Table 6 Passivation polarization curve results

[0088] E. corr (V) i corr (Acm-2) R(ohm) Corrosion rate (mil / year) Elemental manganese -1.178 9.01E-05 377 4.75E+02 After passivation -0.95 5.628E-06 3218 2.971E+01

[0089] In the potassium permangan...

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Abstract

The invention relates to a chromium-free passivator as well as a preparation method and an application thereof. The chromium-free passivator is prepared from the following components in percentage by mass: 45%-91.5% of straight-chain fatty acid alcohol amide compound and 9.5%-55% of straight-chain hydrophobic fatty acid. The preparation method comprises steps as follows: raw materials are taken according to the components and are mixed uniformly, and a finished product is obtained; or a mixture of hydrophobic fatty acid and the fatty acid alcohol amide compound is prepared according to the designed components, then an enhancer is added, and the finished product is obtained. The chromium-free passivator is applicable to surface passivation treatment of metal containing manganese. The developed chromium-free passivator has the characteristics of being good in water solubility, non-toxic, pollution-free, good in manganese passivation performance, capable of realizing membrane self-repairing and the like, an existing electrolytic manganese chromate passivation process can be better replaced, and more remarkable environment-friendly benefit and economic benefit are realized.

Description

technical field [0001] The invention relates to a chromium-free passivator, a preparation method and application thereof, and belongs to the field of manganese metallurgy. Background technique [0002] Manganese and its compounds are widely used in metallurgy, chemical industry, light industry, electronic materials, agriculture and animal husbandry, etc. Especially in the iron and steel industry, the presence of manganese can significantly improve the mechanical properties of steel. a statement. However, due to the low chemical potential and high activity of manganese metal, it is easy to react with oxygen in the air and cause corrosion of manganese metal. The corrosion of manganese will not only greatly reduce the mechanical properties of manganese, but also shorten the use of manganese mechanical equipment. It will destroy the electronic and optical properties of metal materials, and even cause catastrophic accidents and huge economic losses. Therefore, it must be passiva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/58
CPCC23C22/58
Inventor 曹占芳邱培钟宏王帅刘广义
Owner CENT SOUTH UNIV
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