Synthesis and Corrosion Performance of Composites of Polyaniline/Modified Graphite

doi:10.11902/1005.4537.2016.218

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (5): 428-434 DOI: 10.11902/1005.4537.2016.218

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Synthesis and Corrosion Performance of Composites of Polyaniline/Modified Graphite

Qizhan WAN,Ningning CHEN,Peipei YANG,Lian ZHONG(

),Yanhua WANG,Jia WANG

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdaog 266100, China

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Abstract

Polyaniline (PANi) was in situ deposited on the surface of modified graphite (MGE) via different electrochemical methods to prepare composites of PANi/MGE. Their morphology and microstructure were examined by scanning electron microscopy (SEM) and the Fourier transform infrared spectroscopy (FT-IR). While their anticorrosion properties were assessed by corrosion potential measurement and electrochemical impedance spectrometry. Experimental results showed that MGE as a support material can provide sufficient reaction sites for the deposition of aniline to form the film-like composites of PANI/MGE. There exists strong interaction at the interface of PANI and MGE. Test results of anticorrosion performance illustrated that among others, the composite of PANI/MGE prepared by polymerization with constant current step technique showed the best corrosion resistance and the highest open circuit potential.

Key words: Polyaniline modified graphite 2Cr13ss corrosion

Received: 18 November 2016

Fund: Supported by National Natural Science Foundation of China (51131005) and Shandong Provincial Natural Science Foundation of China (BS2012HZ021)

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	Qizhan WAN
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	Lian ZHONG
	Yanhua WANG
	Jia WANG

Cite this article:

Qizhan WAN,Ningning CHEN,Peipei YANG,Lian ZHONG,Yanhua WANG,Jia WANG. Synthesis and Corrosion Performance of Composites of Polyaniline/Modified Graphite. Journal of Chinese Society for Corrosion and protection, 2017, 37(5): 428-434.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.218 OR https://www.jcscp.org/EN/Y2017/V37/I5/428

Fig.1 SEM images of MGE (a), PANI/MGE composites prepared by galvanostatic method (b), constant current stepmethod (c), PANI/MGE made by CV method (d) and self-polymerization method (e) and PANI (f)

Fig.2 FT-IR spectra of MGE (a) and as-polymerized PANI/MGE composites (b) (line 1: PANi/MGE made by Galvanostatic method, line 2: PANi/MGE made by constant current step method, line 3: PANi/MGE made by CV method, line 4: PANi/MGE made by Self-polymerization method, line 5: MGE)

Fig.3 OCP curves (a) and Nyquist plots (b) of 2Cr13 stainless steel coated with MEG and as-polymerized PANI/MGE composites, the magnified view of the square area in Fig.3b (c)

Fig.4 Equivalent circuit for the corrosion of 2Cr13 stainless steel coated with PANI/MGE polymerized by recurrent galvanic pulses method in 1 molL^-1 H₂SO₄ solution

Fig.5 Electrochemical impedance spectroscopies and corresponding fitting results of 2Cr13 stainless steel coated with PANI/MGE coating 2 (a) and MGE coating (b) after immersion in 1 molL^-1 H₂SO₄ solution for different time

Table 1 Fitting values of electrical apparatus elements in equivalent circuit for the corrosion of 2Cr13 stainless steel coated with PANI/MGE polymerized by recurrent galvanic pulses method in 1 molL^-1 H₂SO₄ solution

Table 2 Values of electrical apparatus elements in equivalent circuit for the corrosion of MGE coated 2Cr13 stainless steel in 1 molL^-1 H₂SO₄ solution

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