Kinetics of Corrosion Inhibition of Aluminum in Acidic Media by Water-Soluble Natural Polymeric Pectates as Anionic Polyelectrolyte Inhibitors
Abstract
:1. Introduction
2. Results
2.1. Evolved-Hydrogen (and Weight Loss)—Time Curves
2.2. Dependence of Corrosion Rate on [PEC]
[PEC] | Temperature | |||
---|---|---|---|---|
% (w/v) | 102 mol dm−3 | 30 °C | 35 °C | 40 °C |
0.0 | 0.0 | 0.95 (0.88) * | 1.22 | 1.46 |
0.4 | 1.0 | 0.63 (0.59) | 0.74 | 0.84 |
0.6 | 2.0 | 0.55 (0.50) | 0.66 | 0.77 |
0.8 | 4.0 | 0.50 | 0.59 | 0.68 |
1.2 | 6.0 | 0.46 | 0.54 | 0.62 |
2.3. Dependence of Corrosion Rate on [H+]
[H+], mol dm−3 | 2.0 | 3.0 | 4.0 | 5.0 |
---|---|---|---|---|
Roc (free), mL cm−3 min−1 | 0.39 | 0.77 | 1.46 | 1.98 |
R′c * (inh.), mL cm−1 min−1 | 0.13 | 0.46 | 0.84 | 1.20 |
[PEC] | 30 °C [H+], mol dm−3 | 40 °C [H+], mol dm−3 | |||
---|---|---|---|---|---|
%(w/v) | mol dm−3 | 3.0 | 4.0 | 3.0 | 4.0 |
0.4 | 0.02 | 37.04 | 33.68 | 40.26 | 42.47 |
0.6 | 0.03 | 48.15 | 42.11 | 50.65 | 47.26 |
0.8 | 0.04 | 59.26 | 47.38 | 61.03 | 53.42 |
1.2 | 0.06 | 68.52 | 51.57 | 70.12 | 57.53 |
2.4. Dependence of Corrosion Rate on Temperature
3. Discussion
3.1. Corrosion Mechanism
3.2. Adsorption Isotherm
Parameter | Slope (n) 0.57 | Slope (n) 0.39 |
---|---|---|
102 K, dm3 mol−1 | 28 | 62 |
−ΔG0, kJ mol−1 | 6.91 | 2.81 |
−ΔH0, kJ mol−1 | 15.28 | 16.05 |
−ΔS0, J mol−1 K−1 | 73.30 | 82.40 |
Parameter [PEC] | ΔH≠ kJ mol−1 | ΔS≠ J mol−1K−1 | ΔG≠ kJ mol−1 | Ea≠ kJ mol−1 | A mol−1 s−1 | Rc * mL cm−2 min−1 | %IE * | |
---|---|---|---|---|---|---|---|---|
%(w/v) | mol dm−3 | |||||||
0 | 0 | 30.90 | −177.44 | 83.78 | 33.51 | 9.51 × 103 | 0.95 | – |
0.4 | 0.02 | 20.20 | −216.22 | 84.63 | 22.73 | 0.87 × 102 | 0.70 | 22.22 |
0.6 | 0.03 | 24.8 | −204.57 | 85.04 | 26.61 | 3.54 × 102 | 0.63 | 30.00 |
0.8 | 0.04 | 23.37 | −207. 84 | 85.31 | 24.08 | 1.19 × 102 | 0.50 | 44.44 |
1.2 | 0.06 | 21.07 | −215.99 | 85.43 | 23.66 | 0.91 × 102 | 0.46 | 48.89 |
Activation parameters in alkaline solutions [16] | ||||||||
0 | 0 | 58.85 | −61.97 | 77.31 | 61.15 | 1.11x1011 | 0.63 | – |
0.4 | 0.02 | 88.35 | + 3.69 | 87.31 | 91.06 | 6.83x1013 | 0.32 | 46.67 |
0.8 | 0.04 | 92.63 | + 11.13 | 89.31 | 95.15 | 6.46x1013 | 0.16 | 72.67 |
1.2 | 0.06 | 88.82 | −4.77 | 90.42 | 91.78 | 1.16x1013 | 0.11 | 81.67 |
4. Experimental Section
4.1. Materials
4.2. Preparation of Pectate Sols
4.3. Hydrogen Evolution Measurements
5. Conclusions
References
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Hassan, R.M.; Zaafarany, I.A. Kinetics of Corrosion Inhibition of Aluminum in Acidic Media by Water-Soluble Natural Polymeric Pectates as Anionic Polyelectrolyte Inhibitors. Materials 2013, 6, 2436-2451. https://doi.org/10.3390/ma6062436
Hassan RM, Zaafarany IA. Kinetics of Corrosion Inhibition of Aluminum in Acidic Media by Water-Soluble Natural Polymeric Pectates as Anionic Polyelectrolyte Inhibitors. Materials. 2013; 6(6):2436-2451. https://doi.org/10.3390/ma6062436
Chicago/Turabian StyleHassan, Refat M., and Ishaq A. Zaafarany. 2013. "Kinetics of Corrosion Inhibition of Aluminum in Acidic Media by Water-Soluble Natural Polymeric Pectates as Anionic Polyelectrolyte Inhibitors" Materials 6, no. 6: 2436-2451. https://doi.org/10.3390/ma6062436