Electrochemical method for synthesis of metal-doped polyaniline

FIELD: chemistry.

SUBSTANCE: invention relates to an electrochemical method for synthesis of metal-doped polyaniline, which involves preparation of a solution with the following concentration of components: sulphuric acid 0.5-1.5 mol/dm3, aniline 0.1-0.4 mol/dm3, transition metal salts 0.1-1.0 mol/dm3; conducting electrolysis at temperature of 10-30°C using a working electrode and an auxiliary electrode, wherein the solution preparation step involves further addition of 0.1-0.5 mol/dm3 aminoacetic acid or 0.1-0.5 mol/dm3 disodium salt of ethylenediaminetetraacetic acid; the transition metal salts used are transition metal sulphates; the working electrode and auxiliary electrode used are stainless steel electrodes; electrolysis is carried out with constant current density of 1-10 mA/cm2, and after the electrolysis step, the obtained metal-doped polyaniline is treated with an alkaline solution at pH 8-10.

EFFECT: electrochemical method for synthesis of metal-doped polyaniline is cheap owing to use of stainless steel electrodes, and the obtained metal-doped polyaniline has high passivating capacity.

1 dwg, 3 ex

 

The invention relates to the electrochemical production, namely, electrochemical methods for the synthesis of polyaniline doped with metal used for the passivation of metal to improve corrosion protection of metal constructions and metal products.

Closest to the present invention is a method of synthesis of polyaniline doped with metal, comprising preparing a solution with a concentration of components: sulfuric acid of 0.5-1.5 mol/DM3, aniline 0.1 to 0.4 mol/DM3the chlorides of transition metals of 0.1-1.0 mol/DM3, carrying out electrolysis at a temperature of 10-30°C at constant potential 0,65-0,85; In which case, as a working electrode using a platinum foil or conductive glass, and as an auxiliary electrode using a platinum foil (patent CN 1958852, priority 10.11.2006,).

However, the thus obtained synthesis of polyaniline alloyed metal is quite expensive due to the need for synthesis as electrode material platinum, and the resulting product has a weak passivating ability.

An object of the invention is the reduction method for the synthesis of polyaniline doped with metal, and obtaining a product with a higher passivating ability.

The problem is solved t is m, in the electrochemical method of synthesis of polyaniline doped with metal, comprising preparing a solution with a concentration of components: sulfuric acid of 0.5-1.5 mol/DM3, aniline 0.1 to 0.4 mol/DM3, salts of transition metals of 0.1-1.0 mol/DM3, carrying out electrolysis at a temperature of 10-30°C. use a working electrode and auxiliary electrode, at the stage of preparation of the solution additionally impose 0.1-0.5 mol/DM3aminouksusnoy acid or 0.1-0.5 mol/DM3disodium salt of ethylenediaminetetraacetic acid as salts of transition metals are used, the transition metal sulfates, as the working and auxiliary electrodes using the electrode made of stainless steel, electrolysis is carried out at a constant current density of 1-10 mA/cm2and after the stage of electrolysis received polyaniline alloyed metal is treated with an alkaline solution with a pH of 8-10.

As the alkaline solution using an aqueous solution of sodium hydroxide or ammonium hydroxide.

Components: aniline, sulphuric acid, sulphate of transition metals (copper sulfate, Nickel sulfate, aluminum sulfate, manganese sulfate), aminouksusnoy acid, the disodium salt of ethylenediaminetetraacetic acid is used pure for analysis (reagent grade.) or net (hours).

The invention is illustrated in the following the examples.

Example 1

Prepare a solution with a concentration of components: sulfuric acid 1.0 mol/DM3, aniline 0.2 mol/DM3, aluminum sulfate 0.5 mol/DM3and the disodium salt of ethylenediaminetetraacetic acid, and 0.4 mol/DM3conduct electrolysis at a temperature of 20°C using a working electrode and auxiliary electrode, stainless steel, carry out electrolysis for 50 minutes at a constant current density of 7 mA/cm2. Received polyaniline alloyed metal is treated with sodium hydroxide solution to pH 9, then washed with distilled water and dried, for example, in a drying Cabinet at 60°C.

Example 2

Prepare a solution with a concentration of components: sulfuric acid and 1.5 mol/DM3, aniline 0.4 mol/DM3, manganese sulfate 1.0 mol/DM3and the disodium salt of ethylenediaminetetraacetic acid 0.5 mol/DM3conduct electrolysis at a temperature of 30°C using a working electrode and auxiliary electrode, stainless steel, carry out electrolysis for 30 minutes at a constant current density of 10 mA/cm2. Received polyaniline alloyed metal is treated with sodium hydroxide solution to pH 10, then washed with distilled water and dried, for example at room temperature.

Example 3

Prepare a solution with a concentration to which mponents: sulfuric acid 0.5 mol/DM 3, aniline 0.1 mol/DM3, Nickel sulfate 0.1 mol/DM3and aminouksusnoy acid 0.1 mol/DM3conduct electrolysis at a temperature of 10°C using a working electrode and auxiliary electrode, stainless steel, carry out electrolysis for 120 minutes at a constant current density of 1 mA/cm2. Received polyaniline alloyed metal is treated with ammonium hydroxide solution to pH 8, then washed with distilled water and dried, for example, in a drying Cabinet at 40°C.

Check passivating ability of the obtained polyaniline doped with metal, in comparison with the prototype is as follows. 1% aqueous solution of polyaniline doped with metal, applied on steel specimens of size 2×1 cm, dried at normal temperature and immersed in a 3% aqueous solution of sodium chloride and incubated for 1 hour, and then applied polyaniline, doped metal removed from the surface of the steel sample and estimating the rate of corrosion by electrochemical method in a 3% aqueous solution of sodium chloride, exploring the anodic polarization curves passivated polyaniline, alloyed metal samples for prototype and according to the invention. As can be seen from the curves (Fig.1), the corrosion rate of the samples according to the invention, in 2 -3 times less compared to samples of the prototype.

Thus, the proposed electrochemical method for synthesis of polyaniline doped with metal, through the use of electrodes made of stainless steel instead of electrodes made of platinum is more expensive than the method on the prototype, and received polyaniline, doped metal has a higher passivating ability compared to polyaniline, alloyed metal, obtained by the prototype.

Electrochemical method for synthesis of polyaniline doped with metal, comprising preparing a solution with a concentration of components: sulfuric acid of 0.5-1.5 mol/DM3, aniline 0.1 to 0.4 mol/DM3, salts of transition metals of 0.1-1.0 mol/DM3, carrying out electrolysis at a temperature of 10-30°C. use a working electrode and auxiliary electrode, characterized in that at the stage of preparation of the solution additionally impose 0.1-0.5 mol/DM3aminouksusnoy acid or 0.1-0.5 mol/DM3disodium salt of ethylenediaminetetraacetic acid as salts of transition metals are used, the transition metal sulfates, as the working and auxiliary electrodes using the electrode made of stainless steel, electrolysis is carried out at a constant current density of 1-10 mA/cm2and after the stage of electrolysis received polyaniline, legirovannym the metal, treated with an alkaline solution with a pH of 8-10.



 

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