Hexadecane-thiol Self-assembly Monolayers on Silver for Anti-tarnishing

doi:10.11902/1005.4537.2015.057

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (2): 172-176 DOI: 10.11902/1005.4537.2015.057

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Hexadecane-thiol Self-assembly Monolayers on Silver for Anti-tarnishing

Wenye LU¹,Dieyi CHEN²,Burong CHEN¹(

),Tao TANG¹

1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
2. Kuang Yaming School, Nanjing University, Nanjing 210023, China

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Abstract

Self-assembly monolayers of hexadecane-thiol (HDT) were prepared on the surface of silver and their anti-tarnishing performance was examined by accelerated tarnish test with H₂S. Then the optimal processing parameters were acquired: the temperature is 60 ℃, the concentration of HDT is 0.1 mol/L and the experiment time is 2 h. The self-assembly monolayers were characterized also by means of water drop contact angle, polarization curve, electrochemical impedance spectroscopy and cyclic voltammetry methods. The results showed that the self-assembly monolayers of HDT on the surface of silver were compact, and the effect of anti-tarnishing for silver is excellent. Both anodic and cathodic reactions of corrosion were inhibited by HTD SAMs, the film coverage is 94.8%, and the inhibition efficiency is up to 95.9%.

Key words: hexadecane-thiol self-assembly monolayer silver anti-tarnishing

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	Wenye LU
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	Burong CHEN
	Tao TANG

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Wenye LU,Dieyi CHEN,Burong CHEN,Tao TANG. Hexadecane-thiol Self-assembly Monolayers on Silver for Anti-tarnishing. Journal of Chinese Society for Corrosion and protection, 2016, 36(2): 172-176.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.057 OR https://www.jcscp.org/EN/Y2016/V36/I2/172

Table 1 Results of orthogonal test

Fig.1 Images of bare Ag (a) and HDT covered Ag (b)

Fig.2 Contact angles of water drops on blank (a) and HDT deposited (b) Ag

Fig.3 Polarization curves of blank and HDT covere Ag in 0.05 mol/L Na₂S solution

Table 2 Corrosion current density, Tafel slopes and protection efficiency of bare Ag and HDT covered Ag in 0.05 mol/L Na₂S solution

Fig.4 Nyquist impedance plots of blank and HDT covered Ag in 0.05 mol/L Na₂S solution

Fig.5 Equivalent circuits used to model the EIS data for bare Ag (a) and HDT SAMs coveredAg (b)

Table 3 Fittting results of equivalent circuits and surface coverage (θ ) of HDT SAMs

Fig.6 Cyclic voltammetry curves of blank and HDT SAMscovered Ag

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