N-b-Hydroxyethyl Oleyl Imidazole as Synergist to Enhance the Corrosion Protection Effect of Natural Cocoyl Sarcosine on Steel
Abstract
:1. Introduction
2. Materials and Methods
2.1. Metal Specimens and Weight Loss
2.2. Inhibitors
2.3. Electrochemical Measurements
2.4. Spray Corrosion Test
3. Results and Discussion
3.1. Weight Loss (WL)
3.2. Potentiodynamic Polarization Measurement
3.3. Electrochemical Impedance Spectroscopy Measurement
3.4. Surface Characterization
3.5. Effect of Increasing Immersion Time
3.6. Spray Corrosion Chamber Test
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Element | C | W | Mn | P | S | Cu | Al | Cr | Mo | Ni | Co | W |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Norm [36] | max. 0.120 | n.a. | max. 0.600 | max. 0.045 | max. 0.045 | n.a. | n.a. | n.a. | n.a. | n.a. | n.a. | n.a. |
Present | 0.063 | 0.013 | 0.260 | 0.017 | 0.008 | 0.000 | 0.033 | 0.003 | 0.006 | 0.000 | 0.000 | 0.006 |
Concentration (mmol/L) | WL (mg) × 10−3 | CR (mg⋅cm−2⋅h−1) × 10−5 | Surface Coverage (θ) | IE (%) | |
---|---|---|---|---|---|
Blank | 0 | 5.70 ± 0.86 | 1.900 | - | - |
Inhibitor | |||||
C | 25 | 3.40 ± 0.30 | 1.133 | 0.404 | 40.4 |
50 | 3.25 ± 0.21 | 1.083 | 0.430 | 43.0 | |
75 | 3.23 ± 0.65 | 1.077 | 0.433 | 43.3 | |
100 | 3.13 ± 0.91 | 1.041 | 0.452 | 45.2 | |
OI | 25 | 3.85 ± 0.78 | 1.283 | 0.325 | 32.5 |
50 | 3.37 ± 1.29 | 1.122 | 0.409 | 40.9 | |
75 | 3.30 ± 0.28 | 1.100 | 0.421 | 42.1 | |
100 | 3.25 ± 2.47 | 1.083 | 0.430 | 43.0 | |
C + OI | 25 | 1.50 ± 0.90 | 0.500 | 0.737 | 73.7 |
50 | 1.24 ± 0.92 | 0.413 | 0.782 | 78.2 | |
75 | 1.03 ± 1.56 | 0.343 | 0.819 | 81.9 | |
100 | 0.98 ± 1.55 | 0.328 | 0.827 | 82.7 |
Cinh (mmol/L) | icorr (µA/cm2) | CR (mm/y) | βa (mV/dec) | βc (mV/dec) | Ecorr (mV) | Surface Coverage (θ) | IE (%) | |
---|---|---|---|---|---|---|---|---|
Blank [34] | 0 | 61.93 ± 7.47 | 1.339 | 16.87 | −2.98 | −324 | - | - |
Inhibitor | ||||||||
C | 25 | 49.89 ± 9.01 | 1.082 | 31.00 | −3.54 | −321 | 0.195 | 19.5 |
50 | 40.34 ± 4.93 | 0.875 | 30.03 | −3.91 | −300 | 0.349 | 34.9 | |
75 | 34.59 ± 4.50 | 0.750 | 21.80 | −4.38 | −293 | 0.442 | 44.2 | |
100 | 32.78 ± 1.29 | 0.711 | 22.23 | −4.06 | −288 | 0.471 | 47.1 | |
OI | 25 | 45.55 ± 7.56 | 0.988 | 20.70 | −3.44 | −413 | 0.265 | 26.5 |
50 | 41.76 ± 10.79 | 0.906 | 27.84 | −3.62 | −395 | 0.326 | 32.6 | |
75 | 36.73 ± 2.30 | 0.797 | 23.65 | −3.98 | −411 | 0.407 | 40.7 | |
100 | 33.89 ± 6.06 | 0.735 | 30.58 | −3.04 | −417 | 0.453 | 45.3 | |
C + OI | 25 | 15.77 ± 0.45 | 0.342 | 29.60 | −4.26 | −249 | 0.745 | 74.5 |
50 | 8.52 ± 1.60 | 0.184 | 29.28 | −3.46 | −260 | 0.862 | 86.2 | |
75 | 5.86 ± 2.20 | 0.126 | 36.08 | −4.07 | −232 | 0.905 | 90.5 | |
100 | 5.31 ± 0.52 | 0.115 | 25.90 | −3.64 | −253 | 0.914 | 91.4 |
Cinh (mmol/L) | Rs (Ω cm2) | Rct (Ω cm2) | Cdl (μF/cm2) | Surface Coverage (θ) | IE (%) | |
---|---|---|---|---|---|---|
Blank | 0 | 64.38 | 178.86 | 2.6425 | - | - |
Inhibitor | ||||||
OI | 50 | 90.95 | 331.33 | 2.1919 | 0.460 | 46.0 |
C | 25 | 79.50 | 570.12 | 1.6087 | 0.686 | 68.6 |
50 | 80.34 | 687.26 | 1.5994 | 0.739 | 73.9 | |
75 | 81.40 | 350.28 | 1.5242 | 0.489 | 48.9 | |
100 | 82.17 | 301.33 | 1.8155 | 0.406 | 40.6 | |
C + OI | 25 | 204.15 | 779.33 | 2.2667 | 0.770 | 77.0 |
50 | 267.67 | 977.13 | 2.1470 | 0.816 | 81.6 | |
75 | 96.6 | 1077.27 | 2.1034 | 0.817 | 81.7 | |
100 | 229.56 | 1158.68 | 2.0878 | 0.845 | 84.5 |
Inhibitor | Coating Time (min) | icorr (µA/cm2) | CR (mm/y) | βa (mV/dec) | βc (mV/dec) | Ecorr (mV) | Surface Coverage (θ) | IE (%) |
---|---|---|---|---|---|---|---|---|
Blank [34] | 0 | 61.93 ± 7.47 | 1.339 | 16.87 | −2.98 | −324 | - | - |
C | 1 | 58.62 ± 19.66 | 1.268 | 18.18 | −2.98 | −307 | 0.0534 | 5.34 |
2.5 | 51.66 ± 7.76 | 1.117 | 15.69 | −4.11 | −307 | 0.1658 | 16.6 | |
5 | 36.85 ± 1.88 | 0.797 | 14.59 | −4.28 | −304 | 0.4049 | 40.5 | |
10 | 36.68 ± 4.93 | 0.793 | 30.03 | −3.91 | −300 | 0.4077 | 40.8 | |
30 | 47.21 ± 7.27 | 1.021 | 11.04 | −3.55 | −319 | 0.2376 | 23.8 | |
OI | 1 | 46.06 ± 6.74 | 0.996 | 20.53 | −2.88 | −395 | 0.2562 | 25.6 |
2.5 | 43.31 ± 10.05 | 0.936 | 22.50 | −3.72 | −280 | 0.3006 | 30.1 | |
5 | 41.52 ± 2.01 | 0.898 | 17.42 | −3.68 | −406 | 0.3295 | 33.0 | |
10 | 35.67 ± 0.45 | 0.771 | 27.84 | −3.62 | −395 | 0.4240 | 42.4 | |
30 | 47.74 ± 7.04 | 1.032 | 19.56 | −4.20 | −331 | 0.2291 | 22.9 | |
C + OI | 1 | 17.64 ± 3.32 | 0.381 | 19.92 | −5.55 | −289 | 0.7151 | 71.5 |
2.5 | 13.32 ± 2.28 | 0.288 | 13.72 | −5.54 | −280 | 0.7848 | 78.5 | |
5 | 8.95 ± 1.14 | 0.193 | 14.40 | −5.36 | −289 | 0.8553 | 85.5 | |
10 | 8.52 ± 1.60 | 0.184 | 16.65 | −4.14 | −260 | 0.8624 | 86.2 | |
30 | 9.06 ± 2.49 | 0.195 | 12.39 | −4.77 | −267 | 0.8537 | 85.4 |
Time (h) | Blank | C | IE of C (%) | OI | IE of OI (%) | C + OI | IE of C + OI (%) |
---|---|---|---|---|---|---|---|
2 | 72.03 ± 1.50 | 18.76 ± 0.89 | 74.0 | 19.79 ± 2.22 | 72.5 | 0.25 ± 0.40 | 99.7 |
4 | 81.54 ± 0.99 | 34.28 ± 3.36 | 58.0 | 52.79 ± 7.04 | 35.3 | 1.27 ± 1.09 | 98.4 |
8 | 87.95 ± 1.49 | 51.91 ± 1.78 | 41.0 | 64.06 ± 5.37 | 27.2 | 2.66 ± 2.01 | 97.0 |
14 | 95.35 ± 0.48 | 68.38 ± 3.02 | 28.3 | 77.10 ± 6.02 | 19.1 | 9.05 ± 7.28 | 90.5 |
24 | 97.69 ± 0.48 | 81.57 ± 0.50 | 16.5 | 84.64 ± 7.26 | 13.4 | 19.67 ± 7.62 | 80.0 |
Time (h) | Blank | C + OI 25 mmol/L | IE (%) | C + OI 50 mmol/L | IE (%) | C + OI 75 mmol/L | IE (%) | C + OI 100 mmol/L | IE (%) |
---|---|---|---|---|---|---|---|---|---|
2 | 72.03 ± 1.50 | 55.92 ± 13.55 | 22.4 | 0.25 ± 0.40 | 99.7 | 0.00 ± 0.00 | 100 | 0.00 ± 0.00 | 100 |
4 | 81.54 ± 0.99 | 60.23 ± 9.69 | 26.1 | 1.27 ± 1.09 | 98.4 | 0.40 ± 0.65 | 99.5 | 0.23 ± 0.21 | 99.7 |
8 | 87.95 ± 1.49 | 64.66 ± 11.64 | 26.5 | 2.67 ± 2.01 | 97.0 | 2.14 ± 1.64 | 97.6 | 1.01 ± 0.65 | 98.9 |
14 | 95.35 ± 0.48 | 70.32 ± 9.54 | 26.3 | 9.05 ± 7.28 | 90.5 | 6.58 ± 5.69 | 93.1 | 5.39 ± 1.43 | 94.4 |
24 | 97.69 ± 0.48 | 72.33 ± 10.51 | 26.0 | 19.67 ± 13.62 | 80.0 | 13.98 ± 11.03 | 85.7 | 13.74 ± 2.27 | 86.0 |
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Kaskah, S.E.; Ehrenhaft, G.; Gollnick, J.; Fischer, C.B. N-b-Hydroxyethyl Oleyl Imidazole as Synergist to Enhance the Corrosion Protection Effect of Natural Cocoyl Sarcosine on Steel. Corros. Mater. Degrad. 2022, 3, 536-552. https://doi.org/10.3390/cmd3030029
Kaskah SE, Ehrenhaft G, Gollnick J, Fischer CB. N-b-Hydroxyethyl Oleyl Imidazole as Synergist to Enhance the Corrosion Protection Effect of Natural Cocoyl Sarcosine on Steel. Corrosion and Materials Degradation. 2022; 3(3):536-552. https://doi.org/10.3390/cmd3030029
Chicago/Turabian StyleKaskah, Saad E., Gitta Ehrenhaft, Jörg Gollnick, and Christian B. Fischer. 2022. "N-b-Hydroxyethyl Oleyl Imidazole as Synergist to Enhance the Corrosion Protection Effect of Natural Cocoyl Sarcosine on Steel" Corrosion and Materials Degradation 3, no. 3: 536-552. https://doi.org/10.3390/cmd3030029