Metal surface pretreatment agent and preparation method and application thereof

A treatment agent and metal technology, which is used in the field of metal surface pretreatment agent and its preparation, can not be solved well, generally it will be cross-linked within a few hours to a few days, and the phosphating production line cannot replace the phosphating process. Rinse the film with water and other problems, and achieve the effect of excellent bare mold anti-rust ability, excellent coupling ability with coating, and fast water washing

Inactive Publication Date: 2017-06-30
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in long-term practice, people have found that the organosilanes that can be dissolved in water are mainly aminosilanes and epoxysilanes, but these silanes are not stable after hydrolysis, and generally cross-link within a few hours to a few days
In addition, when the pure silane pretreatment agent is used to treat metals, it first adsorbs on the metal surface through hydrogen bonds. Since the dehydration between Si-OH and Me-OH and Si-OH and Si-OH requires certain conditions, at room temperature or 50 ° C It is difficult to quickly form a stable three-dimensional network structure under the following conditions. Therefore, compared with chromic acid passivation and phosphating, the pure silane treatment agent has a slower film formation speed, and often requires a heating and curing process to obtain a stable silane film. The film cannot be washed with water before the film is completely formed, so it cannot directly replace the phosphating process on the existing phosphating production line

Method used

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  • Metal surface pretreatment agent and preparation method and application thereof
  • Metal surface pretreatment agent and preparation method and application thereof
  • Metal surface pretreatment agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A metal surface pretreatment agent, the composition of which includes in parts by mass: 99 parts of water, 0.01 part of fluozirconic acid, 0.01 part of octa(3-aminopropyl) T8-POSS (CAS registration number: 150380-11-3 ), 0.08 parts of 1,2-bis(trimethoxysilyl)ethane, 0.9 parts of N-aminoethyl-3-aminopropyltriethoxysilane.

[0039] The preparation method of above-mentioned metal surface pretreatment agent mainly comprises the following steps:

[0040] 1) In terms of parts by mass, add 0.01 part of fluozirconic acid to 74 parts of water under stirring, and obtain component A after completely dissolving;

[0041] 2) Add 0.01 part of octa(3-aminopropyl) T8-POSS (CAS registration number: 150380-11-3) to 25 parts of water under stirring, stir and dissolve, then add 0.08 part of 1,2-di( Trimethoxysilyl) ethane, after stirring and dissolving, add 0.9 part of N-aminoethyl-3-aminopropyltriethoxysilane, stir well and use it as component B;

[0042] 3) Add component B to component...

Embodiment 2

[0046] A metal surface pretreatment agent, its composition includes in parts by mass: 54.95 parts of water, 20 parts of ammonium fluorozirconate, 0.01 octa(N-aminoethyl-3-aminopropyl) T8-POSS (CAS registration number : 1185746-13-7), 0.01 parts of 3-aminopropyltriethoxysilane, 10 parts of glycidoxypropylmethyldiethoxysilane, 2 parts of citric acid, 8 parts of malic acid, 0.03 parts of sulfuric acid Cerium, 5 parts ethanol.

[0047] The preparation method of above-mentioned metal surface pretreatment agent mainly comprises the following steps:

[0048] 1) According to the mass fraction, in 14.95 parts of water, add 20 parts of ammonium fluozirconate under the condition of stirring, after completely dissolving, add 2 parts of citric acid, 8 parts of malic acid and 0.03 part of cerium sulfate at a time, and stir evenly to obtain component A ;

[0049] 2) In 40 parts of water, add 5 parts of ethanol and 0.01 part of octa(N-aminoethyl-3-aminopropyl) T8-POSS (CAS registration numb...

Embodiment 3

[0054] A metal surface pretreatment agent, the composition of which includes: 89.3 parts of water, 0.2 parts of fluozirconic acid, 5 parts of 1 octa(2-aminoethyl) T8-POSS (CAS registration number: 1497436-87- 9), 1 part of 1,2-bis(trimethoxysilyl)ethane, 1 part of 3-aminopropyltrimethoxysilane, 1 part of glycidoxypropyltrimethoxysilane, 0.5 part of 36% concentrated Hydrochloric acid, 2 parts methanol.

[0055] The preparation method of above-mentioned metal surface pretreatment agent mainly comprises the following steps:

[0056] 1) According to the mass fraction, in 80 parts of water, add 0.2 part of fluozirconic acid under the condition of stirring, after completely dissolving, add 0.5 part of hydrochloric acid at a time, and stir evenly to obtain component A;

[0057] 2) In 9.3 parts of water, add 2 parts of methanol and 5 parts of octa(2-aminoethyl) T8-POSS (CAS registration number: 1497436-87-9) under stirring, after stirring and dissolving, add 1 part in turn 1,2-bis(t...

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Abstract

The invention discloses a metal surface pretreatment agent. Water is used as a solvent, silane is used as a main film forming agent, fluorozirconate and / or fluorozirconic acid are / is used as a second film forming agent, amidogen cage type silsesquioxane (amidogen POSS) is added and used as a film sealant and a repair agent, and acid, a metal promoter, a rare earth compound and a stabilizer can be included as well. In the film forming process of the metal surface coating pretreatment agent, silane film forming and fluorozirconate ceramic film forming are conducted synchronously, mutual doping is conducted, and a dense inorganic-organic hybrid film is formed; and the defects existing in the fluorozirconate film forming process can be repaired in time through silane, the film structure is optimized, multiple kinds of amidogen of the amidogen POSS can react with multiple sites in the film at the same time, the sealing effect can be improved remarkably, and the defects in the film can be well repaired and sealed.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a metal surface pretreatment agent and its preparation method and application. Background technique [0002] Metal materials are damaged by the action of the surrounding medium, which is called metal corrosion. When metal corrodes, a chemical or electrochemical multiphase reaction occurs between the metal and air, water, etc. on the metal interface, causing the metal to enter an oxidized (ion) state, which will significantly reduce the mechanical properties of the metal material such as strength, plasticity, and toughness. , Destroy the geometric shape of metal components, increase the wear between parts, deteriorate the physical properties such as electrical and optical, and shorten the service life of the equipment. [0003] Application of coating protection on metal surfaces is the most common and important method of preventing metal corrosion. The function of the cove...

Claims

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Application Information

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IPC IPC(8): C23C22/34C23C22/80
CPCC23C22/34C23C22/80
Inventor 黄驰刘张洋张思巍
Owner WUHAN UNIV
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