Acta Metallurgica Sinica (English Letters) ›› 2014, Vol. 27 ›› Issue (6): 1105-1113.DOI: 10.1007/s40195-014-0132-5
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Li Yang, Ma Yuantai, Zhang Bin, Lei Bing, Li Ying(
)
Received:2014-02-17
Revised:2014-04-03
Online:2014-09-11
Published:2015-07-23
Li Yang, Ma Yuantai, Zhang Bin, Lei Bing, Li Ying. Enhancement the Adhesion between Epoxy Coating and Rusted Structural Steel by Tannic Acid Treatment[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(6): 1105-1113.
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| C | S | P | Mn | Si | Cu | Fe |
|---|---|---|---|---|---|---|
| 0.176 | 0.023 | 0.019 | 0.570 | 0.233 | 0.033 | Bal. |
Table 1 Chemical composition of the structural steel Q235 (in wt%)
| C | S | P | Mn | Si | Cu | Fe |
|---|---|---|---|---|---|---|
| 0.176 | 0.023 | 0.019 | 0.570 | 0.233 | 0.033 | Bal. |
| Factor | Level 1 | Level 2 | Level 3 | Level 4 |
|---|---|---|---|---|
| Tannic acid concentration (g/L) | 5 | 10 | 15 | 20 |
| Sodium molybdate concentration (g/L) | 1 | 2 | 3 | 4 |
| Citric acid concentration (g/L) | 1 | 2 | 3 | 4 |
| Mixture of alcohol concentration (g/L) | 5 | 10 | 15 | 20 |
| Temperature (°C) | 20 | 25 | 30 | 35 |
Table 2 Levels of the factors used in the experiments
| Factor | Level 1 | Level 2 | Level 3 | Level 4 |
|---|---|---|---|---|
| Tannic acid concentration (g/L) | 5 | 10 | 15 | 20 |
| Sodium molybdate concentration (g/L) | 1 | 2 | 3 | 4 |
| Citric acid concentration (g/L) | 1 | 2 | 3 | 4 |
| Mixture of alcohol concentration (g/L) | 5 | 10 | 15 | 20 |
| Temperature (°C) | 20 | 25 | 30 | 35 |
| Experiment nos. | Tannic acid concentration (g/L) | Sodium molybdate concentration (g/L) | Citric acid concentration (g/L) | Mixture of alcohol concentration (g/L) | Temperature (°C) | Adhesion (MPa) |
|---|---|---|---|---|---|---|
| 1 | 5 | 1 | 1 | 5 | 20 | 2.36 ± 0.22 |
| 2 | 5 | 2 | 2 | 10 | 25 | 2.89 ± 0.49 |
| 3 | 5 | 3 | 3 | 15 | 30 | 1.83 ± 0.65 |
| 4 | 5 | 4 | 4 | 20 | 35 | 4.22 ± 0.22 |
| 5 | 10 | 1 | 2 | 15 | 35 | 1.94 ± 0.48 |
| 6 | 10 | 2 | 1 | 20 | 30 | 2.70 ± 0.47 |
| 7 | 10 | 3 | 4 | 5 | 25 | 2.80 ± 0.51 |
| 8 | 10 | 4 | 3 | 10 | 20 | 2.11 ± 0.20 |
| 9 | 15 | 1 | 3 | 20 | 25 | 3.27 ± 0.64 |
| 10 | 15 | 2 | 4 | 15 | 20 | 2.76 ± 0.34 |
| 11 | 15 | 3 | 1 | 10 | 35 | 3.70 ± 0.70 |
| 12 | 15 | 4 | 2 | 5 | 30 | 1.95 ± 0.50 |
| 13 | 20 | 1 | 4 | 10 | 30 | 2.36 ± 0.21 |
| 14 | 20 | 2 | 3 | 5 | 35 | 2.39 ± 0.56 |
| 15 | 20 | 3 | 2 | 20 | 20 | 2.22 ± 0.33 |
| 16 | 20 | 4 | 1 | 15 | 25 | 3.42 ± 0.44 |
Table 3 Adhesion strength results of the orthogonal tests
| Experiment nos. | Tannic acid concentration (g/L) | Sodium molybdate concentration (g/L) | Citric acid concentration (g/L) | Mixture of alcohol concentration (g/L) | Temperature (°C) | Adhesion (MPa) |
|---|---|---|---|---|---|---|
| 1 | 5 | 1 | 1 | 5 | 20 | 2.36 ± 0.22 |
| 2 | 5 | 2 | 2 | 10 | 25 | 2.89 ± 0.49 |
| 3 | 5 | 3 | 3 | 15 | 30 | 1.83 ± 0.65 |
| 4 | 5 | 4 | 4 | 20 | 35 | 4.22 ± 0.22 |
| 5 | 10 | 1 | 2 | 15 | 35 | 1.94 ± 0.48 |
| 6 | 10 | 2 | 1 | 20 | 30 | 2.70 ± 0.47 |
| 7 | 10 | 3 | 4 | 5 | 25 | 2.80 ± 0.51 |
| 8 | 10 | 4 | 3 | 10 | 20 | 2.11 ± 0.20 |
| 9 | 15 | 1 | 3 | 20 | 25 | 3.27 ± 0.64 |
| 10 | 15 | 2 | 4 | 15 | 20 | 2.76 ± 0.34 |
| 11 | 15 | 3 | 1 | 10 | 35 | 3.70 ± 0.70 |
| 12 | 15 | 4 | 2 | 5 | 30 | 1.95 ± 0.50 |
| 13 | 20 | 1 | 4 | 10 | 30 | 2.36 ± 0.21 |
| 14 | 20 | 2 | 3 | 5 | 35 | 2.39 ± 0.56 |
| 15 | 20 | 3 | 2 | 20 | 20 | 2.22 ± 0.33 |
| 16 | 20 | 4 | 1 | 15 | 25 | 3.42 ± 0.44 |
| Factor level | Tannic acid concentration | Sodium molybdate concentration | Citric acid concentration | Mixture of alcohol concentration | Temperature |
|---|---|---|---|---|---|
| Level 1 | 2.825 | 2.482 | 3.045 | 2.375 | 2.362 |
| Level 2 | 2.388 | 2.685 | 2.250 | 2.765 | 3.095 |
| Level 3 | 2.920 | 2.638 | 2.400 | 2.487 | 2.210 |
| Level 4 | 2.598 | 2.925 | 3.035 | 3.103 | 3.063 |
| Maximum deviation | 0.532 | 0.443 | 0.795 | 0.728 | 0.885 |
| Factor level | Tannic acid concentration | Sodium molybdate concentration | Citric acid concentration | Mixture of alcohol concentration | Temperature |
|---|---|---|---|---|---|
| Level 1 | 2.825 | 2.482 | 3.045 | 2.375 | 2.362 |
| Level 2 | 2.388 | 2.685 | 2.250 | 2.765 | 3.095 |
| Level 3 | 2.920 | 2.638 | 2.400 | 2.487 | 2.210 |
| Level 4 | 2.598 | 2.925 | 3.035 | 3.103 | 3.063 |
| Maximum deviation | 0.532 | 0.443 | 0.795 | 0.728 | 0.885 |
Fig. 1 Effect plots of the adhesion strength for each level of the control factor
Fig. 2 FTIR spectrum of the rust layer
Fig. 3 FTIR spectrum of the sample after tannic converter treatment
Fig. 4 XPS core level C1s spectrum of the tannic conversion layer
Fig. 5 XPS core level Mo3d spectrum of the tannic conversion layer
Fig. 6 Surface a; cross-section b morphologies of the rust layer
Fig. 7 Surface morphology of the tannic conversion layer a; EDX result of the selected area in a b
Fig. 8 Cross-section morphology of the tannic conversion layer
Fig. 9 Failure morphologies without the tannic converter treatment after the adhesion test measurement: a failure substrate; b relative test dolly
Fig. 10 Failure morphology with the tannic converter treatment after the adhesion test measurement: a failure substrate; b relative test dolly
Fig. 11 FTIR spectrum of the components adhered to the test dolly with the tannic converter treatment
Fig. 12 Micro morphology of the failure substrate with the tannic converter treatment
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