J. Mater. Sci. Technol. ›› 2020, Vol. 39: 48-55.DOI: 10.1016/j.jmst.2019.06.012
• Research Article • Previous Articles Next Articles
Suyun Liuab, Li Liuac*(), Ying Lia, Fuhui Wangac
Received:
2019-01-31
Revised:
2019-05-28
Accepted:
2019-06-17
Published:
2020-02-15
Online:
2020-03-11
Contact:
Liu Li
Suyun Liu, Li Liu, Ying Li, Fuhui Wang. Effects of N-alkylation on anticorrosion performance of doped polyaniline/epoxy coating[J]. J. Mater. Sci. Technol., 2020, 39: 48-55.
Si | Fe | Cu | Mn | Mg | Cr | Ni | Zn | Al |
---|---|---|---|---|---|---|---|---|
0.12 | 0.25 | 0.1 | 0.55 | 4.46 | 0.07 | 0.05 | 0.05 | Bal. |
Table 1 Chemical composition (wt%) of 5083 Al alloy.
Si | Fe | Cu | Mn | Mg | Cr | Ni | Zn | Al |
---|---|---|---|---|---|---|---|---|
0.12 | 0.25 | 0.1 | 0.55 | 4.46 | 0.07 | 0.05 | 0.05 | Bal. |
Fig. 1. FTIR spectra of PANI-SSA (sulfosalicylic acid doped polyaniline) before and after treatment with 10 vol.% C5H11Br and C12H25Br in IPA (isopropanol) and DMF (dimethylformamide) solution for 24 h, respectively.
Fig. 3. Digital photographs of PANI-SSA and N-alkylated PANI-SSA dispersion in epoxy/xylene solution: (a) PANI-SSA; (b) C5-IPA (modified PANI-SSA by C5H11Br in IPA); (c) C5-DMF (modified PANI-SSA by C5H11Br in DMF); (d) C12-IPA (modified PANI-SSA by C12H25Br in IPA); (e) C12-DMF (modified PANI-SSA by C12H25Br in DMF) for different settling time.
Fillers | N state | ||
---|---|---|---|
=N-/N | -NH-/N | N+/N | |
PANI-SSA | 44.8% | 55.2% | -- |
C5-IPA | 36.6% | 42.6% | 20.8% |
C12-DMF | 30.2% | 29.9% | 39.9% |
C12-IPA | 33.9% | 47.2% | 18.9% |
C5-DMF | 32.3% | 35.4% | 32.3% |
Table 2 Compositions of different state of N in PANI-SSA (sulfosalicylic acid doped polyaniline) and N-alkylated PANI-SSA calculated from N 1s spectra of XPS results.
Fillers | N state | ||
---|---|---|---|
=N-/N | -NH-/N | N+/N | |
PANI-SSA | 44.8% | 55.2% | -- |
C5-IPA | 36.6% | 42.6% | 20.8% |
C12-DMF | 30.2% | 29.9% | 39.9% |
C12-IPA | 33.9% | 47.2% | 18.9% |
C5-DMF | 32.3% | 35.4% | 32.3% |
Coatings | Immersion time | ||||
---|---|---|---|---|---|
6 h | 24 h | 96 h | 144 h | 360 h | |
PANI-SSA/epoxy coating | 1.89% | 3.26% | 5.14% | 5.38% | 5.32% |
C5-DMF/epoxy coating | 1.59% | 2.62% | 4.53% | 4.58% | 4.66% |
C12-DMF/epoxy coating | 1.27% | 2.24% | 3.67% | 3.87% | 3.85% |
Table 3 Water absorption (mass%) for PANI-SSA/epoxy coatings, C5-DMF/epoxy coating and C12-DMF/epoxy coating at different time intervals in 3.5% NaCl solution.
Coatings | Immersion time | ||||
---|---|---|---|---|---|
6 h | 24 h | 96 h | 144 h | 360 h | |
PANI-SSA/epoxy coating | 1.89% | 3.26% | 5.14% | 5.38% | 5.32% |
C5-DMF/epoxy coating | 1.59% | 2.62% | 4.53% | 4.58% | 4.66% |
C12-DMF/epoxy coating | 1.27% | 2.24% | 3.67% | 3.87% | 3.85% |
Fig. 6. SEM cross-sectional morphologies of (a) PANI-SSA/epoxy, (b) C5-DMF/epoxy, (c) C12-DMF/epoxy coatings and the corresponding partial magnification of (d) PANI-SSA/epoxy, (e) C5-DMF/epoxy, and (f) C12-DMF/epoxy coatings.
Fig. 7. Water absorption and the corresponding average diffusion velocity curve for the three kind of coatings on different immersion time in 3.5% NaCl solution.
Fig. 8. EIS spectra and the corresponding equivalent electrical circuit of the three coatings system for different immersion periods in 3.5% NaCl solution (with fitting error). Nyquist diagrams: (a) PANI-SSA/epoxy; (c) C5-DMF/epoxy; (e) C12-DMF/epoxy coatings; Bode plots: (b) PANI-SSA/epoxy; (d) C5-DMF/epoxy; (f) C12-DMF/epoxy coatings.
Fig. 10. Wet adhesion results and the corresponding digital photograph showing corrosion morphologies of (a) PANI-SSA/epoxy, (b) C5-DMF/epoxy and (c) C12-DMF/epoxy coatings after 30 d immersion in 3.5% NaCl solution.
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