Preparation method and application of conductive polysiloxane-polyaniline anticorrosive coating

Abstract

The invention belongs to the field of corrosion prevention of metal in saline solutions, and particularly relates to a preparation method and application of a stable super-hydrophobic conductive polysiloxane-polyaniline (PANIC-RA-POS) anticorrosive coating. According to the method, a compact and stable conductive polyaniline film is constructed on a metal surface through an electrochemical method, an external hydrophobic polysiloxane coating is constructed through a spraying method, meanwhile, an adhesive sticker (RA) is sprayed between polyaniline and polysiloxane to form a polysiloxane-polyaniline (PANIC-RA-POS) anti-corrosion coating, which is applied to the field of metal surface corrosion prevention. The coating is divided into an internal conductive polyaniline film PANIC and an external super-hydrophobic coating POS, the PANIC has the unique advantages of spontaneously passivating the metal surface and slowing down pitting corrosion, electrochemical corrosion is effectively reduced, the POS has the characteristic of spontaneously forming an air layer in a corrosive medium, transmission of a corrosive medium and electrons can be efficiently blocked, chemical corrosion is effectively reduced, the adhesive sticker glue spray SA enhances the binding force between the PANIC and the POS, and the metal corrosion resistance is effectively improved.

Description

technical field

[0001] The invention belongs to the field of anticorrosion of metals in saline solution, and specifically relates to a preparation method and application of a stable superhydrophobic conductive polysiloxane-polyaniline anticorrosion coating. Background technique

[0002] The annual loss caused by metal corrosion accounts for about 3% of the world's GDP. It is an urgent problem to be solved in contemporary industry and society. Various anti-corrosion methods such as cathodic protection, building passivation layer, composite coating and corrosion inhibitor have been obtained. Widely used, among which the construction of chromium trioxide passivation layer and organic coating are the two most commonly used methods, the construction of chromium trioxide passivation layer requires the use of carcinogenic chromate, while the traditional organic composite coating only has the function of isolating The effect of the corrosive medium on the metal substrate is not obvi...

Examples

Embodiment 1

[0040] (1) Preparation of PANIC film: Shanghai CHI660E three-electrode electrochemical workstation was used, the reference electrode was SCE, the counter electrode was platinum wire, the working electrode was 304 stainless steel, polished with 800#~1000# water-phase sandpaper, and then in acetone and ethanol respectively After ultrasonic cleaning for 10 minutes, evaporate to dry naturally. At room temperature, the conductive PANIC film was prepared by cyclic voltammetry, and the electrolyte was 0.2mol / L H 2 SO 4 The aqueous solution was added with 0.2mol / L An, 0.2mol / L DL-MA and 0.2mol / L CAM, and the electrochemical parameters were -0.2~1.0V, 20mV / s and 20 cycles. The obtained samples were heat-treated at 60°C for 12 h in a blast drying oven.

[0041] (2) Preparation of POS suspension: In 50mL absolute ethanol, add 0.1mL distilled water and 0.2g SiO2 , 0.03mol / L DTMS, 0.02mol / L TEOS, 0.05mol / L GPTS and 0.025mol / L OA, the dissolution of OA requires ultrasonic treatment for 10...

Embodiment 2

[0044] (1) Preparation of PANIC film: Shanghai CHI660E three-electrode electrochemical workstation was used, the reference electrode was SCE, the counter electrode was platinum wire, the working electrode was 304 stainless steel, polished with 800#~1000# water-phase sandpaper, and then in acetone and ethanol respectively After ultrasonic cleaning for 10 minutes, evaporate to dry naturally. At room temperature, the conductive PANIC film was prepared by cyclic voltammetry, and the electrolyte was 0.2mol / L H 2 SO 4 The aqueous solution was added with 0.2mol / L An, 0.2mol / L DL-MA and 0.2mol / L CAM, and the electrochemical parameters were -0.2~1.0V, 20mV / s and 20 cycles. The obtained samples were heat-treated at 60°C for 12 h in a blast drying oven.

[0045] (2) Preparation of POS suspension: In 50mL absolute ethanol, add 0.1mL distilled water and 0.3g SiO 2 , 0.03mol / L DTMS, 0.02mol / L TEOS, 0.05mol / L GPTS and 0.025mol / L OA, the dissolution of OA requires ultrasonic treatment for ...

Embodiment 3

[0048] (1) Preparation of PANIC thin film: Shanghai CHI660E three-electrode electrochemical workstation was used, the reference electrode was SCE, the counter electrode was platinum wire, the working electrode was 304 stainless steel, which was polished with 800#~1000# aqueous phase sandpaper, and then in acetone and ethanol respectively After ultrasonic cleaning for 10 minutes, evaporate to dry naturally. At room temperature, the conductive PANIC film was prepared by cyclic voltammetry, and the electrolyte was 0.2mol / L H 2 SO 4 The aqueous solution was added with 0.2mol / L An, 0.2mol / L DL-MA and 0.2mol / L CAM, and the electrochemical parameters were -0.2~1.0V, 20mV / s and 20 cycles. The obtained samples were heat-treated at 60°C for 12 h in a blast drying oven.

[0049] (2) Preparation of POS suspension: In 50mL absolute ethanol, add 0.1mL distilled water and 0.4g SiO 2 , 0.03mol / L DTMS, 0.02mol / L TEOS, 0.05mol / L GPTS and 0.025mol / L OA, the dissolution of OA requires ultrason...

technical field

[0001] The invention belongs to the field of anticorrosion of metals in saline solution, and specifically relates to a preparation method and application of a stable superhydrophobic conductive polysiloxane-polyaniline anticorrosion coating. Background technique

[0002] The annual loss caused by metal corrosion accounts for about 3% of the world's GDP. It is an urgent problem to be solved in contemporary industry and society. Various anti-corrosion methods such as cathodic protection, building passivation layer, composite coating and corrosion inhibitor have been obtained. Widely used, among which the construction of chromium trioxide passivation layer and organic coating are the two most commonly used methods, the construction of chromium trioxide passivation layer requires the use of carcinogenic chromate, while the traditional organic composite coating only has the function of isolating The effect of the corrosive medium on the metal substrate is not obvi...

Examples

Embodiment 1

[0040] (1) Preparation of PANIC film: Shanghai CHI660E three-electrode electrochemical workstation was used, the reference electrode was SCE, the counter electrode was platinum wire, the working electrode was 304 stainless steel, polished with 800#~1000# water-phase sandpaper, and then in acetone and ethanol respectively After ultrasonic cleaning for 10 minutes, evaporate to dry naturally. At room temperature, the conductive PANIC film was prepared by cyclic voltammetry, and the electrolyte was 0.2mol / L H 2 SO 4 The aqueous solution was added with 0.2mol / L An, 0.2mol / L DL-MA and 0.2mol / L CAM, and the electrochemical parameters were -0.2~1.0V, 20mV / s and 20 cycles. The obtained samples were heat-treated at 60°C for 12 h in a blast drying oven.

[0041] (2) Preparation of POS suspension: In 50mL absolute ethanol, add 0.1mL distilled water and 0.2g SiO2 , 0.03mol / L DTMS, 0.02mol / L TEOS, 0.05mol / L GPTS and 0.025mol / L OA, the dissolution of OA requires ultrasonic treatment for 10...

Embodiment 2

[0044] (1) Preparation of PANIC film: Shanghai CHI660E three-electrode electrochemical workstation was used, the reference electrode was SCE, the counter electrode was platinum wire, the working electrode was 304 stainless steel, polished with 800#~1000# water-phase sandpaper, and then in acetone and ethanol respectively After ultrasonic cleaning for 10 minutes, evaporate to dry naturally. At room temperature, the conductive PANIC film was prepared by cyclic voltammetry, and the electrolyte was 0.2mol / L H 2 SO 4 The aqueous solution was added with 0.2mol / L An, 0.2mol / L DL-MA and 0.2mol / L CAM, and the electrochemical parameters were -0.2~1.0V, 20mV / s and 20 cycles. The obtained samples were heat-treated at 60°C for 12 h in a blast drying oven.

[0045] (2) Preparation of POS suspension: In 50mL absolute ethanol, add 0.1mL distilled water and 0.3g SiO 2 , 0.03mol / L DTMS, 0.02mol / L TEOS, 0.05mol / L GPTS and 0.025mol / L OA, the dissolution of OA requires ultrasonic treatment for ...

Embodiment 3

[0048] (1) Preparation of PANIC thin film: Shanghai CHI660E three-electrode electrochemical workstation was used, the reference electrode was SCE, the counter electrode was platinum wire, the working electrode was 304 stainless steel, which was polished with 800#~1000# aqueous phase sandpaper, and then in acetone and ethanol respectively After ultrasonic cleaning for 10 minutes, evaporate to dry naturally. At room temperature, the conductive PANIC film was prepared by cyclic voltammetry, and the electrolyte was 0.2mol / L H 2 SO 4 The aqueous solution was added with 0.2mol / L An, 0.2mol / L DL-MA and 0.2mol / L CAM, and the electrochemical parameters were -0.2~1.0V, 20mV / s and 20 cycles. The obtained samples were heat-treated at 60°C for 12 h in a blast drying oven.

[0049] (2) Preparation of POS suspension: In 50mL absolute ethanol, add 0.1mL distilled water and 0.4g SiO 2 , 0.03mol / L DTMS, 0.02mol / L TEOS, 0.05mol / L GPTS and 0.025mol / L OA, the dissolution of OA requires ultrason...

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