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Process for preparing polyaniline film on electroplated zinc steel plates through electric polymerization

A technology of polyaniline film and process method, which is applied in the direction of electrophoretic plating, electrolytic paint, coating, etc., can solve the problems of electropolymerized polyaniline film, etc., and achieve the effects of favorable environmental protection, simple equipment and simple process

Inactive Publication Date: 2005-06-29
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is no report of one-step electropolymerization of polyaniline film on zinc or electrogalvanized steel sheet

Method used

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  • Process for preparing polyaniline film on electroplated zinc steel plates through electric polymerization

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: In 0.2mol / L aniline, 0.5mol / L sodium salicylate aqueous solution, adjust to PH=6.5 with hydrochloric acid, use constant potential method to polymerize aniline in ice-water bath, constant potential voltage is 1.7V, polymerization time for 60s, and then heat treatment at 200°C for 20 minutes, and finally a layer of polyaniline film can be coated on the electro-galvanized steel sheet.

[0020] For the electro-galvanized steel plate coated with electropolymerized polyaniline film, according to the GB6458-86 standard, a neutral salt spray test is carried out: the appearance time of white rust is 10 hours.

Embodiment 2

[0021] Embodiment two: in 0.5mol / L aniline and 1mol / L sodium salicylate aqueous solution, adjust to PH=6.0 with sulfuric acid, use potentiostatic method to polymerize aniline in ice-water bath, constant potential voltage is 1.5V, polymerization time is 120s, and then heat treatment at 200°C for 40 minutes, and finally a layer of polyaniline film can be coated on the electro-galvanized steel sheet.

[0022] For the electro-galvanized steel plate coated with electropolymerized polyaniline film, refer to the GB6458-86 standard. Conduct a neutral salt spray test: the appearance time of white rust is 9 hours.

Embodiment 3

[0023] Embodiment three: in 0.2mol / L aniline and 0.5mol / L sodium salicylate aqueous solution, adjust to PH=6.5 with hydrochloric acid, use constant current method to polymerize aniline in ice-water bath, the current density of constant current method is 10mA / cm 2 , the polymerization time is 60s; then heat treatment is carried out at 200°C for 30 minutes; finally, a layer of polyaniline film is coated on the electro-galvanized steel sheet;

[0024] For the electro-galvanized steel plate coated with electropolymerized polyaniline film, according to the GB6458-86 standard, the neutral salt spray test was carried out, and the white rust appeared for 11 hours.

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Abstract

The invention relates to a process method for preparing a polyaniline film by electropolymerization on an electrogalvanized steel plate. The invention belongs to the technical field of electrochemical preparation of thin films on metal surfaces. The invention discloses a process for preparing polyaniline film by electropolymerization on electrogalvanized steel sheet, which is characterized in that: preparing polyaniline film on electrogalvanized steel sheet is a one-step electropolymerization preparation method; In the neutral aqueous solution of sodium salicylate, the aniline monomer is used as the raw material, and the aniline is polymerized in the ice-water bath by the constant potential method, the constant current method or the cyclic voltammetry method in the electrochemical method. The method of the present invention has the advantages of: a single one-step method, simple process, single reaction, and simple device; mild reaction conditions and high efficiency; the liquid solution is harmless and non-toxic, has no pollution to the environment, and is beneficial to environmental protection; the prepared The product has good corrosion resistance and is suitable for use as an anti-corrosion material in industry.

Description

technical field [0001] The invention relates to a process method for preparing a polyaniline film by electropolymerization on an electrogalvanized steel plate. The invention belongs to the technical field of electrochemical preparation of thin films on metal surfaces. Background technique [0002] The development and research of conductive polymers as non-toxic and harmless anti-corrosion materials has become a new topic and new focus in the technical circles, especially in the research of chromate passivation technology that replaces electroplating zinc. At present, more studies are conducted on conductive polyaniline film anticorrosion materials. The preparation method is mainly to obtain conjugated polymers by oxidizing aniline monomers with oxidants or coupling metal organic compounds, and then dissolving them in a suitable solvent. Coated on metal surfaces. The process of this coating method is very complicated and cumbersome, in which the concentration of aniline mon...

Claims

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Application Information

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IPC IPC(8): C25D13/06
Inventor 印仁和赵亚萍董晓明
Owner SHANGHAI UNIV
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