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Table 4 Corrosion inhibition efficiency of thiophene derivatives at 35 °C, for 12 h

From: Synthesis of thiophene derivatives and their anti-microbial, antioxidant, anticorrosion and anticancer activity

Inhibitors Conc. Ppm Weight before Weight after Weight loss Corrosion rate (mg/cm2 h) Inhibition efficiency (%) Surface area coverage
  Blank 0.7296 0.6706 0.059 18.27
S1 50 0.7187 0.7035 0.0152 4.71 74.24 0.74
100 0.7106 0.6998 0.0108 3.34 81.69 0.82
200 0.7185 0.7097 0.0088 2.72 85.08 0.85
300 0.7189 0.7123 0.0066 2.04 88.81 0.89
S2 50 0.7292 0.7165 0.0127 3.93 76.04 0.76
100 0.7354 0.7251 0.0103 3.19 80.57 0.81
200 0.7055 0.6995 0.006 1.86 88.68 0.89
300 0.7123 0.7080 0.0043 1.33 91.89 0.92
S3 50 0.7073 0.695 0.0123 3.81 77.68 0.78
100 0.701 0.6911 0.0099 3.06 82.03 0.82
200 0.7045 0.6973 0.0072 2.23 86.93 0.87
300 0.7046 0.6990 0.0056 1.73 89.84 0.90
S4 50 0.7144 0.7057 0.0087 2.69 86.41 0.86
100 0.6956 0.6888 0.0068 2.11 89.38 0.89
200 0.7098 0.7023 0.0075 2.32 88.28 0.88
300 0.7198 0.7123 0.0075 2.32 88.28 0.88
S5 50 0.7062 0.6933 0.0129 3.99 80.45 0.80
100 0.7028 0.6941 0.0087 2.69 86.82 0.87
200 0.7004 0.6964 0.004 1.24 93.94 0.94
300 0.7045 0.7008 0.0037 1.15 94.39 0.94
S6 50 0.7057 0.6932 0.0125 3.87 77.27 0.77
100 0.7967 0.7896 0.0071 2.20 87.09 0.87
200 0.7177 0.7128 0.0049 1.52 91.09 0.91
300 0.7123 0.7080 0.0043 1.33 92.18 0.92
S7 50 0.7208 0.7098 0.011 3.41 83.53 0.84
100 0.7091 0.703 0.0061 1.89 90.87 0.91
200 0.7102 0.7079 0.0023 0.71 96.56 0.97
300 0.7103 0.7089 0.0014 0.43 97.90 0.98
S8 50 0.7152 0.7023 0.0129 3.99 79.84 0.80
100 0.7333 0.7264 0.0069 2.14 89.22 0.89
200 0.7225 0.7187 0.0038 1.18 94.06 0.94
300 0.7046 0.7009 0.0037 1.15 94.22 0.94
S9 50 0.7272 0.7114 0.0158 4.89 77.10 0.77
100 0.7221 0.712 0.0101 3.13 85.36 0.85
200 0.7193 0.7115 0.0078 2.41 88.70 0.89
300 0.7330 0.7260 0.007 2.17 89.86 0.90
S10 50 0.718 0.7047 0.0133 4.12 77.46 0.77
100 0.7382 0.7311 0.0071 2.20 87.97 0.88
200 0.6981 0.6934 0.0047 1.46 92.03 0.92
300 0.712 0.708 0.004 1.24 93.22 0.93
  1. Obs. the highest inhibition efficiency (%) in 7th column is showed in italics