Electrochemically Accelerated Evaluation of Protectiveness for an Alkyd Varnish Coating

doi:10.11902/1005.4537.2018.004

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (3): 274-282 DOI: 10.11902/1005.4537.2018.004

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Electrochemically Accelerated Evaluation of Protectiveness for an Alkyd Varnish Coating

Qi GUI, Dajiang ZHENG, Guangling SONG(

)

Center for Marine Materials Corrosion & Protection, College of Materials, Xiamen University, Xiamen 361005, China

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Abstract

High corrosion resistant organic coatings are widely used for various industrial applications. These coatings normally have service life as long as tens of years. It is of great scientific interest and engineering significance to rapidly evaluate and compare the corrosion resistance of different long-life organic coatings. Different from the negative DC voltage used in the published AC/DC/AC (alternating current/direct current/alternating current) cyclic method to cathodically polarize an organic coating system before AC electrochemical impedance spectrum (EIS) in each cycle, a positive voltage was employed in this paper for the DC polarization in the AC/DC/AC cycling. The modified AC/DC/AC technique proved to be able to accelerate the damage of an alkyd varnish coating on carbon steel and thus quickly evaluate the coating corrosion resistance. Based on the measured impedance spectra and the recorded surface morphologic changes, the acceleration processes involved in the coating corrosion damage were analyzed, and a physical model for the accelerated failure of the coating/metal system was proposed. Based on the experiment results of electrochemical impedance spectroscopy and corrosion morphology from the immersion test, AC/cathodic DC/AC cyclic accelerated test, and AC/anodic DC/AC cyclic accelerated test, it shows that the evaluation method with the combination of cathodic and anodic polarization will be one of the effective and reasonable methods to evaluate the performance of organic coatings.

Key words: organic coating electrochemical impedance spectroscopy accelerated corrosion cathodic polarization anodic polarization

Received: 07 January 2018

ZTFLH:

TG174.46

Fund: Supported by National Key R&D Plan (2017YFB0702100)

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Cite this article:

Qi GUI, Dajiang ZHENG, Guangling SONG. Electrochemically Accelerated Evaluation of Protectiveness for an Alkyd Varnish Coating. Journal of Chinese Society for Corrosion and protection, 2018, 38(3): 274-282.

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https://www.jcscp.org/EN/10.11902/1005.4537.2018.004 OR https://www.jcscp.org/EN/Y2018/V38/I3/274

Fig.1 Schematic diagram of the AC/DC/AC test procedure

Fig.2 AC impedance Bode plots of the coated steel after immersion for different soaking time (a) and equivalent circuit of EIS of the coated sample after total 79.9 h immersion (b)

Fig.3 Evolutions of C_c (a), R_po (b), C_dl (c) and R_ct (d) derived from EIS data for the coated steel with soaking time

Fig.4 Surface morphologies of the coated steel before (a) and after (b) 79.9 h immersion and failure model of the coating/metal system during soaking (c)

Fig.5 AC impedance Bode plots (a) and current density vs time curves (b) of the coated steel at different cycles of AC/cathodic DC/AC test (b)

Fig.6 Evolutions of C_c (a), R_po (b), C_dl (c) and R_ct (d) derived from EIS data for the coated steel during AC/cathodic DC/AC cycling test

Fig.7 Optical micrographs of the coated steel before (a) and after (b) AC/cathodic DC/AC test and failure model of the coating/metal system due to AC/cathodic DC/AC cycling (c)

Fig.8 AC impedance Bode plots of the coated steel at different cycles of AC/anodic DC/AC test (a) and current density vs time curve during the seventh cycling test (b)

Fig.9 Evolutions of C_c (a), R_po (b), C_dl (c) and R_ct (d) derived from EIS data for the coated metal during AC/anodic DC/AC cycling test

Fig.10 Optical micrographs of the coated steel before (a) and after (b) AC/anodic DC/AC test, optical micrograph of the defect in Fig.10b (c), and surface morphology of the steel in the defect (d)

Fig.11 Failure model of the coating/metal system under anodic polarization

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