Full
Outline
To improve the corrosion resistance of waterborne epoxy coating， chitosan is adsorbed onto the surface of multi-walled carbon nanotubes via surface-deposition crosslinking with glutaraldehyde as the crosslinking agent. Then， stearic acid has been grafted using a water-soluble coupling agent，1-ethyl-（3-dimethylaminopropyl）carbodiimide hydrochloride （EDC·HCl），to synthesize stearic acid/chitosan-modified multi-walled carbon nanotubes （SA/CS-CNTs）. Aqueous epoxy anticorrosive coatings are prepared by blending SA/CS-CNTs with aqueous epoxy resin. The structure of SA/CS-CNTs has been characterized， and the corrosion resistance performances of the coatings have been explored. The results show that the epoxy resin with 0.5% （mass fraction）SA/CS-CNTs filler has the best corrosion resistance. Compared with the pure waterborne epoxy coating， its low-frequency impedance modulus is increased by about 5 orders of magnitude， the corrosion inhibition efficiency increases to 99.66%， and the water contact angle reaches 104.2°. The corrosion potential increases by 0.39 V，and the corrosion current density decreases from 4.17×10-6 A·cm-2 to 1.44×10-8 A·cm-2. After being immersed in 3.5% NaCl solution for 96 h， its impedance modulus is still above 107 Ω·cm2.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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