Research Article
Development of Castor Oil Based Poly(urethane-esteramide)/TiO2 Nanocomposites as Anticorrosive and Antimicrobial Coatings
Table 2
Corrosion parameter for coated and uncoated MS in different corrosive environments.
| | Sample code | Medium | (mV) | (mA/cm2) | Corrosion rate (mm/yr) | | | Inhibition efficiency (%) |
| | Mild steel | 3.5 wt% HCl | −483.06 | 2.5857 | 27.65 | 93.13 | 137.71 | — | | UCPEA-7 | 3.5 wt% HCl | −515.35 | 4.959 × 10−4 | 6.810 × 10−2 | 445.41 | 431.92 | 99.98 | | UCPEA-9 | 3.5 wt% HCl | −249.58 | 9.750 × 10−5 | 1.130 × 10−3 | 462.99 | 154.16 | 99.77 | | UCPEA-11 | 3.5 wt% HCl | −480.31 | 4.045 × 10−6 | 4.688 × 10−5 | 431.04 | 860.86 | 99.99 | | UCPEA-13 | 3.5 wt% HCl | 419.22 | 1.129 × 10−7 | 1.309 × 10−6 | 391.37 | 247.72 | 99.99 | | Mild steel | 5.0 wt% NaCl | −760.85 | 4.445 × 10−1 | 5.1627 | 102.06 | 138.85 | — | | UCPEA-7 | 5.0 wt% NaCl | −561.09 | 2.251 × 10−3 | 2.609 × 10−2 | 372.72 | 209.89 | 99.38 | | UCPEA-9 | 5.0 wt% NaCl | −573.97 | 1.746 × 10−4 | 2.024 × 10−3 | 280.21 | 321.94 | 99.96 | | UCPEA-11 | 5.0 wt% NaCl | −449.39 | 1.215 × 10−3 | 1.408 × 10−2 | 179.77 | 183.25 | 99.72 | | UCPEA-13 | 5.0 wt% NaCl | −107.86 | 8.271 × 10−7 | 9.587 × 10−6 | 318.32 | 253.65 | 99.99 | | Mild steel | Tap water | −474.96 | 3.366 × 10−2 | 3.901 × 10−1 | 111.62 | 526.04 | — | | UCPEA-7 | Tap water | −661.63 | 4.281 × 10−4 | 4.962 × 10−3 | 353.43 | 277.28 | 98.72 | | UCPEA-9 | Tap water | −577.37 | 3.190 × 10−4 | 3.697 × 10−3 | 484.94 | 157.34 | 99.05 | | UCPEA-11 | Tap water | −659.04 | 9.760 × 10−5 | 1.113 × 10−4 | 288.57 | 311.79 | 99.71 | | UCPEA-13 | Tap water | −515.14 | 8.654 × 10−5 | 1.003 × 10−3 | 307.27 | 224.87 | 99.74 | | Mild steel | 3.5 wt% NaOH | −455.70 | 1.787 × 10−3 | 2.071 × 10−2 | 272.36 | 246.63 | — | | UCPEA-7 | 3.5 wt% NaOH | −458.32 | 9.850 × 10−5 | 1.141 × 10−3 | 596.21 | 192.97 | 94.09 | | UCPEA-9 | 3.5 wt% NaOH | −445.21 | 1.180 × 10−3 | 1.368 × 10−2 | 334.64 | 165.38 | 33.96 | | UCPEA-11 | 3.5 wt% NaOH | −426.85 | 1.180 × 10−3 | 1.368 × 10−2 | 336.64 | 165.38 | 33.96 | | UCPEA-13 | 3.5 wt% NaOH | −361.30 | 4.789 × 10−4 | 5.551 × 10−3 | 441.75 | 79.37 | 73.20 |
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