In order to solve the problem of high zinc content of the conventional zinc-rich coating，the carbon nanotube-modified waterborne epoxy zinc-rich anticorrosive coatings wereprepared by adding carbon nanotubes（CNTs）to the epoxy emulsion as an aqueous slurry.Thesurface morphology of the coatings was observed by scanning electron microscope（SEM）.The mechanical property was characterized by adhesion and impact resistance tests. The opencircuit potential（OCP），polarization curve and salt spray test methods were used to investigatethe effect of CNTs content on the corrosion resistance of epoxy zinc-containing anticorrosivecoatings.The results showed that the impact resistance was enhanced and the effect of thecoatings on adhesion was not significant with incorporation of CNTs to the coatings. Thecorrosion protection of the coatings was increased firstly then decreased.Compared with the blank system with 60% of zinc content，the corrosion current density reduced by 66.7% with 0.2% of CNTs，and reduced by 53.8% compared with the bank system of 70% of zinc content.there was not any obvious corrosion after 2000h salt spray test.In other words，adding 0.2%CNTs in the system with 60.0% zinc content could not only reduce the zinc content in thecoatings by 10.0%，but also enhance the anticorrosive performance of the coatings.
LIU Heng-Hao
,
SUN Jing
,
JIANG Yong
. Effect of Carbon Nanotubes on Corrosion Resistance of Waterborne Epoxy Zinc Rich Anticorrosive Coatings[J]. Paint & Coatings Industry, 2019
, 49(8)
: 23
-28
.
DOI: 10.12020/j.issn.0253-4312.2019.8.23
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