Abstract
As a new type of anticorrosive material, basalt flakes (BFs) have been widely used in the marine industry due to their good acid and alkali corrosion resistance and dispersion stability. In this work, the effect of carbon nanotubes (CNTs) addition on properties improvement of basalt flake epoxy resin (CNT-BF/EP) coating was studied. Firstly, 0–0.7 wt.% acidified CNTs was used to modify the surface of the BFs and the CNT-BF/EP coating was successfully prepared. Experimental results showed that the performance of the interfacial compatibility, the tensile strength, and acid and alkali resistance of the CNT-BF/EP coating were significantly improved with the addition of the CNTs. Particularly, the CNT-BF/EP coating achieved the best comprehensive properties (tensile strength increased to 30.3 MPa, surface weight loss rate of only 1.0 wt.% in the acid environment for 480 h, and water absorption of only 1.1 wt.% after 480 h) when the CNTs addition reached 0.5 wt.%. This work suggests a feasible way to enhance the mechanical properties and chemical durability of the basalt flakes coating.
Highlights
Nowadays, the corrosion of ships, wharves, and various marine engineering equipment has attracted more and more attention [1]
The acid treatment can open five or seven-membered ring defects at the ports and introduce functional groups such as carboxyl (–COOH) and hydroxyl (–OH) into the surface of carbon nanotubes (CNTs) ports and sidewalls, which is conducive to its subsequent reaction [17]
Excess addition of the CNTs plays a negative role in the tensile strength, chemical durability, and water blocking of the basalt flakes (BFs) coating
Summary
The corrosion of ships, wharves, and various marine engineering equipment has attracted more and more attention [1]. The application of coatings becomes more extensive in the marine industry due to its advantages such as simple operation, low cost, and good anti-corrosion effect. Flake anticorrosive coatings are widely used in the marine industry because of their high efficiency, simple construction, strong adhesion, and good corrosion resistance [2]. Glass flake (GF) is one of the first kinds of materials studied and used in the area of flake anticorrosive coatings [3,4]. Graphite flakes and mica flakes anticorrosive coatings are widely applied [5,6]. There are three main functions of flakes in the coatings: (1) flakes can enhance the chemical durability of the coatings;
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