Corrosion Inhibition of Silver by HDT Self-assembled Monolayers

doi:10.11901/1005.3093.2015.601

Chinese Journal of Materials Research

2016, Vol. 30

Issue (9): 697-702 DOI: 10.11901/1005.3093.2015.601

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Corrosion Inhibition of Silver by HDT Self-assembled Monolayers

Wenye LU¹,Dieyi CHEN²,Tao TANG¹,Burong CHEN^1,^*

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

Cite this article:

Wenye LU,Dieyi CHEN,Tao TANG,Burong CHEN. Corrosion Inhibition of Silver by HDT Self-assembled Monolayers. Chinese Journal of Materials Research, 2016, 30(9): 697-702.

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Abstract

The self-assembled monolayers (SAMs) of hexadecane-thiol (HDT) were prepared on silver surface in ethanol solution. The adsorption behavior of HDT SAMs on silver surface and their corrosion inhibition were investigated by means of polarization curve, reflectance, EPMA, AFM and XPS. The results indicate that the HDT SAMs are dense and stable and do not affect the original appearance of silver, while exhibit also excellent inhibiting effect. In the solution with 0.05 mol/ dm³ Na₂S, the inhibition efficiency is up to 91.7% for the HDT SAMs prepared in the ethanol solution with 0.1 mol/dm³ HDT. The polarization curve shows that HDT acts as a mixed type inhibitor with cathodic inhibition as dominative action. The adsorption of HDT on the silver surface obeys the Langmuir adsorption law and contains both physisorption and chemisorption.

Key words: metallic materials hexadecane-thiol self-assembled monolayer silver corrosion inhibition

Received: 02 December 2015

Fund: *Supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions

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	Wenye LU
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	Tao TANG
	Burong CHEN

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.601 OR https://www.cjmr.org/EN/Y2016/V30/I9/697

Fig.1 Potential-time curve for silver electrode in assembling HDT SAMs

Fig.2 Polarization curves of silver electrodes immersed in 0.05 mol/L Na₂S solution and assembled for different concentration of HDT solution

Table 1 Electrochemical parameters of silver electrodes immersed in 0.05 mol/L Na₂S solution with different concentrations of HDT SAMs

Fig.3 Results of accelerated tarnish test (a) blank and (b) HDT

Fig.4 Reflectance of the bare silver and HDT SAMs covered silver

Fig.5 EPMA specrta of HDT SAMs covered silver

Table 2 Composition of HDT SAMs covered silver

Fig.6 AFM image of HDT SAMs covered silver with tapping mode

Fig.7 XPS spectra of bare silver (a) and silver with HDT SAMs (b)

Fig.8 XPS spectra of the O1s region for the bare sliver and silver with HDT SAMs

Fig.9 XPS spectra of the S2p region for the HDT SAMs covered silver

Fig.10 Curve fitting of the corrosion data for silver electrode according to Langmuir thermodynamic kinetic model

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