Effect of Applied Cathodic Protection Potential on Cathodic Delamination of Damaged Epoxy Coating

doi:10.11902/1005.4537.2018.079

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (3): 235-244 DOI: 10.11902/1005.4537.2018.079

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Effect of Applied Cathodic Protection Potential on Cathodic Delamination of Damaged Epoxy Coating

Guirong WANG^1,²,Yawei SHAO¹(

),Yanqiu WANG¹,Guozhe MENG¹,Bin LIU¹

1. College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
2. Aviation Industry Chengdu Aircraft Industry (Group) Co., LTD., Chengdu 610092, China

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Abstract

The combined effectiveness of the cathodic protection and epoxy coating for a steel, which is newly developed for offshore platform, as well as the cathodic delamination behavior of the epoxy coating with damages in artificial seawater at room temperature were examined by means of electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM), energy dispersive spectrum (EDS) and X-ray diffractometer (XRD). Results indicated that as the potential goes down within the selected range of protection potentials of -750~-1050 mV (vs SEC), the delamination area of the coatings increases. The ordinary protection potential -750 mV (vs SEC) for epoxy coatings is no longer applicable for the damaged coatings, while the cathode potential -1050 mV leads to serious hydrogen evolution in the damaged area, resulting in the integrity destruction of the deposited film there, leading to the seriously interfacial alkalization and therewith, the cathodic delamination area increases. However, the protection potential of -850 or -950 mV can inhibit the corrosion of metal on the damaged site of coating. The deposited film formed under -950 mV on the damaged site is composed of Mg(OH)₂ and CaCO₃ which is of integrity and dense, leading to the best protective effect on the substrate.

Key words: epoxy coating cathodic protection potential damaged area cathodic delamination

Received: 03 June 2018

ZTFLH:

TG174.461

Fund: National Key Research Program of Ministry of Science and Technology(2016YFB0300604)

Corresponding Authors: Yawei SHAO E-mail: shaoyawei@hrbeu.edu.cn

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	Guirong WANG
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	Bin LIU

Cite this article:

Guirong WANG,Yawei SHAO,Yanqiu WANG,Guozhe MENG,Bin LIU. Effect of Applied Cathodic Protection Potential on Cathodic Delamination of Damaged Epoxy Coating. Journal of Chinese Society for Corrosion and protection, 2019, 39(3): 235-244.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.079 OR https://www.jcscp.org/EN/Y2019/V39/I3/235

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