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Preparation technique of high-density polypyrrole film anticorrosive coating

A technology of anti-corrosion coating and preparation process, applied in coating, electrolytic coating, electrophoretic plating, etc., can solve the problems affecting the adhesion and mechanical properties of polypyrrole film, shorten the effective protection time of polypyrrole film, etc.

Inactive Publication Date: 2007-09-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this will affect the adhesion and mechanical properties of the polypyrrole film and shorten the effective protection time of the polypyrrole film.

Method used

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  • Preparation technique of high-density polypyrrole film anticorrosive coating
  • Preparation technique of high-density polypyrrole film anticorrosive coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1, first, use oxalic acid and oxalate to prepare an oxalate solution with a concentration of 0.01mol / L, adjust the pH value of the solution to 7, then add pyrrole monomers to the solution to make the concentration of pyrrole monomers 0.3 mol / L, to obtain solution A; secondly, toluenesulfonic acid is dissolved in the acetocyanide solution containing 1% water and is prepared to be the toluenesulfonic acid solution that concentration is 0.6mol / L, then adds pyrrole in this solution Make the concentration of pyrrole monomer 0.3mol / L to obtain solution B, immerse the copper or copper alloy to be protected in solution A and carry out electrochemical polymerization by cyclic voltammetry to obtain copper or copper alloy modified by polypyrrole film Electrode C; Finally, immerse copper or copper alloy C in solution B for electrochemical polymerization, control the solution temperature between -5 degrees Celsius, and the polymerization current density is 16mA / cm 2 , a laye...

Embodiment 2

[0010] Example 2, first, use oxalic acid and oxalate to prepare an oxalate solution with a concentration of 0.05mol / L, adjust the pH value of the solution to 5, and then add pyrrole monomers to the solution so that the concentration of pyrrole monomers is 0.01 mol / L, to obtain solution A; secondly, toluenesulfonic acid is dissolved in the acetocyanide solution containing 1% water and is prepared as the toluenesulfonic acid solution that concentration is 0.4mol / L, then adds pyrrole in this solution Make the concentration of pyrrole monomer 0.01mol / L to obtain solution B, immerse the copper or copper alloy to be protected in solution A and carry out electrochemical polymerization by cyclic voltammetry to obtain copper or copper alloy modified by polypyrrole film Electrode C; Finally, immerse copper or copper alloy C in solution B for electrochemical polymerization, control the solution temperature between -3 degrees Celsius, and the polymerization current density is 12mA / cm 2 , ...

Embodiment 3

[0011] Example 3, first, use oxalic acid and oxalate to prepare an oxalate solution with a concentration of 0.3 mol / L, adjust the pH value of the solution to 1, then add pyrrole monomers to the solution to make the concentration of pyrrole monomers 0.1 mol / L, to obtain solution A; secondly, dissolving toluenesulfonic acid in the acetocyanide solution containing 1% water and preparing a concentration of 0.2mol / L toluenesulfonic acid solution, then adding pyrrole to the solution Make the concentration of pyrrole monomer 0.1mol / L to obtain solution B, immerse the copper or copper alloy to be protected in solution A and carry out electrochemical polymerization by cyclic voltammetry to obtain copper or copper alloy modified by polypyrrole film Electrode C; Finally, immerse copper or copper alloy C in solution B for electrochemical polymerization, control the solution temperature between 0 degrees Celsius, and the polymerization current density is 8mA / cm 2 , a layer of high-density ...

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Abstract

The invention discloses a process for preparing high density polypyrrole film anti-corrosion coat, wherein the solution A is produced by adding pyrrole monomer into oxalic acid radical solution; the solution B is produced by dissolving methyl benzene sulfonic acid into acetonitrile solution, then the protected copper or copper alloy is immerged into the solution A, and polymerize by an electrochemical process using cyclic voltammetry to produce polypyrrole film-modified copper or copper alloy electrode C; lastly, copper or copper alloy electrode C is immerged into the solution B, and polymerize by an electrochemical process to produce a layer of high density polypyrrole film D on the surface of copper or copper alloy electrode C. The film produced on the surface of copper by the invention is more compact than generally-synthetical polypyrrole film, can efficiently prevent corrosion ion from penetrating through the coat for a long time, and improve the corrosion potential of copper and reduce corrosion current, while the coat has higher adhesivity, but also corrosion of metal can be avoided by producing passivating film after scuffing the coat.

Description

technical field [0001] The invention relates to an anti-corrosion technology, in particular to a preparation process of a high-density polypyrrole film anti-corrosion coating. technical background [0002] Metal corrosion is a metallurgical reverse process that occurs quietly and spontaneously. The natural environment (atmosphere, ocean and microorganisms, etc.) and industrial media (acid, alkali, salt and gas, etc.) may cause corrosion of materials, which brings huge losses to the national economy. According to statistics, metals scrapped due to corrosion every year Equipment and materials are equivalent to 1 / 3 of metal output. Therefore, an effective anti-corrosion coating is very necessary. Since the commonly used chromium-containing anti-corrosion coatings are harmful to the environment, people have conducted a lot of research on environmentally friendly anti-corrosion coatings. Studies have shown that the use of conductive polymers PPy, polyaniline PANi and polythioph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/08
Inventor 徐友龙王杰孙孝飞
Owner XI AN JIAOTONG UNIV
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