Corrosion Inhibition and Adsorption Behavior of Green Corrosion Inhibitor SDDTC on AZ31B Mg-alloy

doi:10.11902/1005.4537.2016.253

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (1): 62-67 DOI: 10.11902/1005.4537.2016.253

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Corrosion Inhibition and Adsorption Behavior of Green Corrosion Inhibitor SDDTC on AZ31B Mg-alloy

Haiyuan WANG¹, Yinghui WEI^1,²(

), Huayun DU¹, Baosheng LIU¹, Chunli GUO¹, Lifeng HOU¹

1 College of Materials Science and Engineering, TaiYuan University of Technology, Taiyuan 030024, China
2 Shanxi Institute of Technology, Yangquan 045000, China

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Abstract

The corrosion inhibition and adsorption behavior of sodium diethyldithiocarbamate (SDDTC) on AZ31B Mg-alloy in 3.5% (mass fraction) NaCl solution were investigated by means of potentiodynamic polarization measurement, electrochemical impedance spectroscopy (EIS), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Results showed that SDDTC could inhibit effectively the corrosion for AZ31B Mg-alloy in NaCl solution, and acted as a mixed-type inhibitor with predominant control of the cathodic reaction. When the concentration of SDDTC was 5 mmolL^-1, the inhibition efficiency was the best. The physical adsorption of SDDTC on the AZ31B Mg-alloy surface obeyed the Langmuir adsorption isotherm. While SDDTC adsorbed on the surface of Mg-alloy forms a much compact protective film, effectively inhibiting the corrosion of AZ31B Mg-alloy.

Key words: AZ31B Mg-alloy sodium diethyldithiocarbamate (SDDTC) NaCl solution corrosion inhibition

Received: 03 January 2017

ZTFLH:

TG174.4

Fund: Supported by National Natural Science Foundation of China (51374151), Key Scientific Research Project in Shanxi Province (MC2016-06 and 201603D111004) and Shanxi Scholarship Council of China (2017-029)

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	Haiyuan WANG
	Yinghui WEI
	Huayun DU
	Baosheng LIU
	Chunli GUO
	Lifeng HOU

Cite this article:

Haiyuan WANG, Yinghui WEI, Huayun DU, Baosheng LIU, Chunli GUO, Lifeng HOU. Corrosion Inhibition and Adsorption Behavior of Green Corrosion Inhibitor SDDTC on AZ31B Mg-alloy. Journal of Chinese Society for Corrosion and protection, 2018, 38(1): 62-67.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.253 OR https://www.jcscp.org/EN/Y2018/V38/I1/62

Fig.1 Polarization curves of AZ31B magnesium alloy in 3.5%NaCl solutions containing various concentrations of SDDTC

Table 1 Polarization parameters of AZ31B magnesium alloy in 3.5%NaCl solutions containing various concentrations of SDDTC and changes of pH values of the solutions

Fig.2 Nyquist diagrams of AZ31B magnesium alloy in 3.5%NaCl solutions containing various concentrations of SDDTC

Fig.3 Equivalent circuit models for AZ31B magnesium alloy in 3.5%NaCl solutions without (a) and with (b) SDDTC

Table 2 Electrochemical impedance parameters of AZ31B magnesium alloy in 3.5%NaCl solutions containing various concentrations of SDDTC

Fig.4 Langmuir adsorption isotherm of SDDTC on AZ31Bmagnesium alloy in 3.5%NaCl solution

Fig.5 FT-IR spectra of AZ31B magnesium alloy after 3 d immersion in 3.5%NaCl solutions without (a) and with 5.0 mmolL^-1 (b) SDDTC and pure SDDTC powder (c)

Fig.6 SEM images of AZ31B magnesium alloy after immersion in 3.5%NaCl solutions without (a) and with(b) 5.0 mmolL^-1 SDDTC for 3 d

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