Preparation and Anticorrosive Performance of a Basalt Organic Coating for Deep Sea Coupled Pressure-fluid Environment

doi:10.11902/1005.4537.2023.142

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (4): 704-712 DOI: 10.11902/1005.4537.2023.142

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Preparation and Anticorrosive Performance of a Basalt Organic Coating for Deep Sea Coupled Pressure-fluid Environment

MENG Fandi¹(

), GAO Haodong¹, LIU Li¹, CUI Yu², LIU Rui¹, WANG Fuhui¹

^1.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract

Sheet-like blocking inorganic fillers are widely used in the marine anti-corrosion coating field as their high aspect ratios significantly extend the diffusion path of the corrosive medium in organic coatings. However, under the coupling action of pressure-flow of seawater in the deep sea, the weak point at the filler/resin interface in the coating often cracks due to stress concentration. To address this issue, the purpose of this article is to study the feasibility of application of the modified basalt flakes, as a filler material, to enhance the adhesion of the filler/resin interface of organic coatings. Basalt flakes were firstly chemically etched to endow with peculiar surface morphology, which afterwards were modified with a silane coupling agent to reduce their surface energy. As a result, the wettability of the modified basalt flakes to the organic resin and the interfacial bonding between the modified basalt flakes and the resin are all significantly enhanced. The failure behavior of the coating under the coupling action of pressure-flow of seawater in a simulated deep sea condition showed that the etched-modified basalt filler had a good compatibility with the resin, and the surface coupling agent molecules could participate in the curing of the coating and further increase the interfacial bonding between the coating and the filler. After corrosion test in artificial seawater by couplingaction of pressure-flow conditions for 240 h, the impedance modulus (|Z|_{0.01 Hz}) of the etched-modified basalt epoxy (EMB/E) coating was one order of magnitude higher than that of the unmodified basalt (B/E) coating. Therefore, the basalt organic coating effectively reduces the deterioration of the filler/coating interface under the coupling action of pressure-flow of seawater in simulated deep sea conditions. It can be expected to select the epoxy coating with modified basalt flakes as a candidate coating of better protective performance for engineering application in deep-sea environments.

Key words: basalt flake organic coating deep sea environment anti-corrosion performance

Received: 07 May 2023 32134.14.1005.4537.2023.142

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52271052);National Natural Science Foundation of China(U20A20233);Fundamental Research Funds for the Central Universities(N2102014)

Corresponding Authors: MENG Fandi, E-mail: fandimeng@mail.neu.edu.cn

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	MENG Fandi
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Cite this article:

MENG Fandi, GAO Haodong, LIU Li, CUI Yu, LIU Rui, WANG Fuhui. Preparation and Anticorrosive Performance of a Basalt Organic Coating for Deep Sea Coupled Pressure-fluid Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(4): 704-712.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2023.142 OR https://www.jcscp.org/EN/Y2023/V43/I4/704

Fig.1 Schematic diagram of etching-modification process of basalt flakes

Fig.2 FT-IR spectra of basalt scales under different treatment

Fig.3 TGA curves of basalt scales under different treatment

Fig.4 SEM images of four basalt scales: (a) basalt scale, (b) etched basalt scale, (c) modified basalt scale, (d) etched-modified basalt scale

Fig.5 Contact angle of four basalt scales: (a-d) water contact angle, (e-h) oil contact angle

Fig.6 Water absorption curves for B/E coating and EMB/E coating under the pressure-fluid coupled environment

Fig.7 Nyquist (a-c), Bode (d) plots and corresponding equivalent circuits (e) of B/E coating/steel system under the coupled environment

Fig.8 Nyquist (a-c) and Bode (d) plots of EMB/E coating/steel system under the coupled environment

Fig.9 SEM images of B/E (a) and EMB/E (b) coating surface after 120 h immersion

Fig.10 Schematic of the protective mechanism of EMB/E coating under the deep sea pressure-fluid coupled environment

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