From: Anticorrosive efficacy and adsorptive study of guar gum with mild steel in acidic medium
Medium | Inhibitor conc. | 6Â h | 24Â h | 48Â h | 72Â h | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Wt.loss | CR | IE% | Wt.loss | CR | IE% | Wt.loss | CR | IE% | Wt.loss | CR | IE% | ||
(gm) | (mm/yr) | Â | (gm) | (mm/yr) | Â | (gm) | (mm/yr) | Â | (gm) | (mm/yr) | Â | ||
1N HCl | 0 | 0.145 | 1.92 | – | 0.518 | 6.8867 | – | 0.957 | 12.71 | – | 1.727 | 22.944 | – |
250 | 0.046 | 0.606 | 68.46 | 0.097 | 1.2881 | 81.295 | 0.145 | 1.9197 | 84.896 | 0.319 | 4.244 | 81.503 | |
500 | 0.040 | 0.536 | 72.07 | 0.094 | 1.252 | 81.819 | 0.134 | 1.7745 | 86.038 | 0.243 | 3.226 | 85.94 | |
750 | 0.036 | 0.484 | 74.82 | 0.079 | 1.0478 | 84.785 | 0.123 | 1.6283 | 87.189 | 0.208 | 2.7634 | 87.956 | |
1000 | 0.041 | 0.549 | 71.41 | 0.073 | 0.974 | 85.857 | 0.104 | 1.3843 | 89.108 | 0.163 | 2.1652 | 90.56 | |
1N H2SO4 | 0 | 0.220 | 29.17 | – | 0.808 | 107.38 | – | 1.991 | 264.45 | – | 2.678 | 355.72 | – |
250 | 0.048 | 6.409 | 78.03 | 0.165 | 21.954 | 79.555 | 0.509 | 67.56 | 74.453 | 0.945 | 125.59 | 64.695 | |
500 | 0.045 | 5.924 | 79.69 | 0.141 | 18.724 | 82.563 | 0.458 | 60.91 | 76.967 | 0.854 | 113.47 | 68.101 | |
750 | 0.033 | 4.415 | 84.86 | 0.120 | 15.971 | 85.127 | 0.372 | 49.432 | 81.307 | 0.670 | 88.943 | 74.996 | |
1000 | 0.030 | 4.024 | 86.21 | 0.102 | 13.516 | 87.41 | 0.324 | 42.979 | 83.747 | 0.496 | 65.859 | 81.485 | |
1N HNO3 | 0 | 0.882 | 117.1 | – | 1.537 | 204.14 | – | 1.212 | 160.98 | – | 1.121 | 148.86 | – |
250 | 0.305 | 40.53 | 65.4 | 0.405 | 53.748 | 73.67 | 0.720 | 95.64 | 40.588 | 0.729 | 96.826 | 34.954 | |
500 | 0.333 | 44.17 | 62.29 | 0.59 | 78.393 | 61.6 | 0.875 | 116.24 | 27.789 | 0.905 | 120.24 | 19.224 | |
750 | 0.399 | 53.06 | 54.7 | 0.771 | 102.49 | 49.8 | 0.929 | 123.36 | 23.368 | 0.918 | 121.92 | 18.099 | |
1000 | 0.427 | 56.7 | 51.6 | 0.818 | 108.68 | 46.76 | 0.937 | 124.41 | 22.714 | 0.943 | 125.25 | 15.858 |