Self-assembly Process of Hexadecanethiol on Silver Plating Surface and Its Protectiveness

doi:10.11902/1005.4537.2019.023

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (3): 281-288 DOI: 10.11902/1005.4537.2019.023

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Self-assembly Process of Hexadecanethiol on Silver Plating Surface and Its Protectiveness

ZHAO Boru¹, SUN Zhi¹, ZHAO Jianwei²(

), CHEN Zhidong¹(

)

1 School of Materials Science and Engineering, Changzhou University, Changzhou 213100, China
2 College of Materials and Textile Engineering, Jiaxing University, Jiaxing 314001, China

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Abstract

The self-assembly process of hexadecanethiol on the surface of Ag-plating on Cu-plate has been studied by means of charge and discharge capacitance method, contact angle measurement, and electrochemical impedance spectroscopy. The theoretical fitting to the capacitance data acquired from tests in 10 and 100 μmol·L^-1 solution gives the adsorption rate constants of (1.3±0.2)×10⁶ and (2.8±0.5)×10⁴ mol^-1·L·s^-1 respectively, which are closed to those of (9.3±0.7)×10⁵ and (3.4±0.6)×10⁴ mol^-1·L·s^-1 obtained by using contact angle measurements. The results indicate that the adsorption rate constant of hexadecanethiol in the dilute solution is higher than that in the concentrated one. Tafel polarization curves reveal that both anodic and cathodic currents are significantly reduced while the silver plating was immersed in 5 mmol·L^-1 hexadecanethiol solution for 15 min, correspondingly the corrosion inhibition rate reaches 98.6%. Furthermore, when the Ag-plating was firstly covered with a self-assembled film through immersion in 5 mmol·L^-1 hexadecanethiol solution and then subjected to post heat treatment at 80 ℃ for 12 h, as expected, the treated Ag-plating exhibits excellent corrosion resistance to Na₂S solution and H₂S containing atmosphere. Therefore, the application of hexadecanethiol solution is effective and feasible in practice.

Key words: hexadecanethiol self-assembly silver plating corrosion

Received: 13 February 2019

ZTFLH:

TG172.3

Fund: Natural Science Foundation of Zhejiang Province(LY19B030006);Natural Science Foundation of Zhejiang Province(LY19E090005)

Corresponding Authors: ZHAO Jianwei,CHEN Zhidong E-mail: jwzhao@mail.zjxu.edu.cn;zdchen@cczu.edu.cn

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ZHAO Boru, SUN Zhi, ZHAO Jianwei, CHEN Zhidong. Self-assembly Process of Hexadecanethiol on Silver Plating Surface and Its Protectiveness. Journal of Chinese Society for Corrosion and protection, 2020, 40(3): 281-288.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.023 OR https://www.jcscp.org/EN/Y2020/V40/I3/281

Fig.1 Cyclic voltammetry curves of silver plating layer soaked in 100 μmol·L^-1 C₁₆H₃₃SH solution for different time in 0.15 mol·L^-1 KNO₃ solution (a), and time-dependences of surface coverage of silver soaked in the C₁₆H₃₃SH solution of different concentration (b)

Fig.2 Measured (a) and calculated (b) values of the contact angle of silver sample socked in the solutions with different concentrations of C₁₆H₃₃SH as a function of socking time

Fig.3 Nyquist plots determined in 0.15 mol·L^-1 KNO₃ solution for short time (a) and long time (b) for the silver plating layer soaked in 100 μmol·L^-1 C₁₆H₃₃SH solution for different time

Fig.4 Tafel polarization curves obtained in 3.5%NaCl solution for silver sample soaked in the solutions with different concentrations of C₁₆H₃₃SH for 15 min

Table 1 Corrosion parameters obtained from Tafel curves

Fig.5 Macro-appearances of silver samples without (a) and with soaking in 1 mmol·L^-1 (b), 3 mmol·L^-1 (c) and 5 mmol·L^-1 (d) C₁₆H₃₃SH solutions and then high temperature treatment

Fig.6 Macro-appearances of silver samples without (a) and with soaking in 1 mmol·L^-1 (b), 3 mmol·L^-1 (c, e) and 5 mmol·L^-1 (d, f) C₁₆H₃₃SH solutions for 15 min and then corrosion in 0.1 mol·L^-1 Na₂S solution for 0.5 h (a~d) and 1 h (e, f)

Fig.7 Macro-appearances of silver samples without (a) and with soaking in 1 mmol·L^-1 (b), 3 mmol·L^-1 (c) and 5 mmol·L^-1 (d) C₁₆H₃₃SH solutions and then H₂S corrosion

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