Research of Compound Volatile Corrosion Inhibitors for Cast Iron Relics

doi:10.11902/1005.4537.2014.068

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (3): 265-270 DOI: 10.11902/1005.4537.2014.068

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Research of Compound Volatile Corrosion Inhibitors for Cast Iron Relics

Fei TENG,Yuyang JING,Gang HU(

)

School of Archaeology and Museology, Peking University, Beijing 100871, China

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Abstract

Applying volatile corrosion inhibitors is an effective way to protect cast iron relics. Herewith several new formulas of compounds of cyclohexylamine carbonate (CHC) with various kinds of inhibitors were designed and prepared for cast iron. Then their performance of corrosion inhibition was studied by means of electrochemical measurements and XPS. Results show among others that CHC with methenamine exhibits significant synergistic effect, i.e. a compound of mixed methenamine and CHC with a mass ratio 1∶4 exhibits the highest inhibition efficiency up to 96.61%. This mix-type compound inhibitor, which mainly suppressed the anodic reaction, could be chemically absorbed on the cast iron surface to act as a well-functioned protective film for cast iron relics.

Key words: compound volatile corrosion inhibitor cast iron inhibition mechanism

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Cite this article:

Fei TENG,Yuyang JING,Gang HU. Research of Compound Volatile Corrosion Inhibitors for Cast Iron Relics. Journal of Chinese Society for Corrosion and protection, 2015, 35(3): 265-270.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.068 OR https://www.jcscp.org/EN/Y2015/V35/I3/265

Fig.1 Experimental set-up of gas phase corrosion inhibition

Table 1 Inhibition efficiency of the mixed gas phase corrosion inhibitors

Fig.2 Polarization curves of cast iron immersed in sodium chloride solutions with different inhibitors

Fig.3 Nyquist plots of cast iron in sodium chloride solutions without or with inhibitors

Table 2 Polarization data of cast iron samples immersed in sodium chloride solutions with different inhibitors

Fig.4 Equivalent circuit models for impedance fitting without (a) and with (b) inhibitor

Table 3 Electrochemical parameters of EIS

Fig.5 XPS spectra (a), iron element spectra (b) and oxygen element spectra (c) of cast iron before and after prefilming

Fig.6 XPS spectrum of nitrogen element on the surface of test sample with composite VCIprefilming

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