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EIS measurements of 4 coating samples
Source：Corrtest
Time：2021-12-22
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EIS measurements of 4 coating samples
Aim: to evaluate the protection of coating(through different treatments) on the low carbon steel based on EIS measurements
Four types of samples:
#1: coating sample through oiling plate vitrification
#2: coating sample through oiling plate phosphating
#3: coating sample through Chromium-free passivation plate vitrification
#4: coating sample through Chromium-free passivation plate degreasing
Corrosion media: 3.5% NaCl solution
Experiment method: EIS- Frequency
Experiment Setup: CS350 potentiostat galvanostat, CS936 flat corrosion cell,(exposure WE area 1cm2. The cell is put in a Faraday cage. )
Pt mesh (built-in in flat corrosion cell) as CE, CS900 saturated calomel electrodes as RE, Coating sample as WE.
Parameters setting: AC amplitude is 10mV during measurement, frequency range is 100kHz~0.01Hz, choose “logarithmic” scan, points/decade is “10”..png)
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2-1: EIS of #1coating sample through oiling plate vitrification
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2-2 EIS of #2: coating sample through oiling plate phosphating
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Aim: to evaluate the protection of coating(through different treatments) on the low carbon steel based on EIS measurements
Four types of samples:
#1: coating sample through oiling plate vitrification
#2: coating sample through oiling plate phosphating
#3: coating sample through Chromium-free passivation plate vitrification
#4: coating sample through Chromium-free passivation plate degreasing
Corrosion media: 3.5% NaCl solution
Experiment method: EIS- Frequency
Experiment Setup: CS350 potentiostat galvanostat, CS936 flat corrosion cell,(exposure WE area 1cm2. The cell is put in a Faraday cage. )
Pt mesh (built-in in flat corrosion cell) as CE, CS900 saturated calomel electrodes as RE, Coating sample as WE.
Parameters setting: AC amplitude is 10mV during measurement, frequency range is 100kHz~0.01Hz, choose “logarithmic” scan, points/decade is “10”.
- EIS plots of the four samples
2-1: EIS of #1coating sample through oiling plate vitrification
2-2 EIS of #2: coating sample through oiling plate phosphating
2-3 EIS of #3 coating sample through Chromium-free passivation plate vitrification
2-4 EIS of #4 coating sample through Chromium-free passivation platedegreasing
Impedance of sample #1 and #2
Table 1 coating impedance data
3. Conclusion
| Test time/h | 0.01Hz coating impedance /Ω•cm2 | |
| #1 vitrification |
#2: phosphating | |
| 24 | 1.11×109 | 9.73×108 |
| 72 | 2.99×109 | 3.18×109 |
| 240 | 6.40×109 | 3.10×109 |
| 480 | 4.65×109 | 2.42×109 |
Impedance of sample #3 and #4
Table 2 impedance data
| Test time/h | 0.01Hz coating impedance/Ω•cm2 | |
| Sample #3 | Sample #4 | |
| 24 | 1.08×109 | 1.12×109 |
| 72 | 2.89×109 | 2.80×109 |
| 240 | 3.01×109 | 2.92×109 |
| 480 | 2.59×108 | 7.38×108 |
3. Conclusion
(1)Under the same conditions, compared with the sample #2, the impedance of the coating #1 is bigger, indicating that the sample #1 has better anti-corrosion abilities.
(2) Under the same conditions, compared with the sample #4, the impedance of the coating #3 is bigger, indicating that the sample #3 has better anti-corrosion abilities.
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