Abstract
Because flammable organic solvents are emitted during the construction process, oil-based conductive coatings generally result in potential safety problems. A high content of conductive mediums can also weaken the adhesive and protective abilities of existing conductive coatings. Therefore, an anticorrosive and conductive coating was prepared on Q235 steel substrate by spraying the multi-walled carbon nanotubes (MWCNTs)/waterborne polyurethane (WPU) dispersion with a low MWCNT content in this work. The effect of the MWCNT content on the electrical conductivity, corrosion resistance, and adhesive strength of the WPU conductive coating was investigated. It was concluded that a spatial network structure of MWCNTs-WPU was formed to make the coating structure more compact. The electrical conductivity, corrosion resistance, and adhesive strength of the WPU conductive coating first increased and then decreased as the MWCNT content increased. When the MWCNT content was only 0.2 wt % (which was far lower than that of the existing conductive coatings at 1 wt %), the coating began to conduct electricity; its resistivity was 12,675.0 Ω·m. The best combination property was the 0.3 wt % MWCNTs/WPU conductive coating. Its adhesive strength was 19.99% higher than that of pure WPU coating. Its corrosion rate was about one order of magnitude lower than that of pure WPU coating after being immersed in 3.5 wt % NaCl solution for 17 days.
Highlights
Most of the raw materials and products from petrochemical enterprises are corrosive and flammable, and sparks arising from triboelectric charging can cause flammable raw materials to catch fire
In order to solve the practical issues above, waterborne polyurethane (WPU) with a safe and reliable ability was used as a polymer matrix [12], and multi-walled carbon nanotubes (MWCNTs) with good properties of corrosion resistance and electroconductibility was used as a conductive medium [13,14]
The effect of the MWCNT content on the electrical conductivity, corrosion resistance, and adhesive strength of the WPU conductive coating prepared by electrostatic spraying was investigated, and the results may provide a theoretical basis for preparing water-based conductive coating with low conductive mediums content by electrostatic spraying
Summary
Most of the raw materials and products from petrochemical enterprises are corrosive and flammable, and sparks arising from triboelectric charging can cause flammable raw materials to catch fire . Polymers 2018, 10, 1406 between the conductive coating and the steel substrate and in its worst properties of corrosion resistance and electrical conductivity [10,11]. In order to solve the practical issues above, waterborne polyurethane (WPU) with a safe and reliable ability was used as a polymer matrix [12], and multi-walled carbon nanotubes (MWCNTs) with good properties of corrosion resistance and electroconductibility was used as a conductive medium [13,14]. The effect of the MWCNT content on the electrical conductivity, corrosion resistance, and adhesive strength of the WPU conductive coating prepared by electrostatic spraying was investigated, and the results may provide a theoretical basis for preparing water-based conductive coating with low conductive mediums content by electrostatic spraying
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