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International Journal of ChemTech Research CODEN (USA): IJCRGG, ISSN: 0974-4290, ISSN(Online):2455-9555 Vol.10 No.3, pp 229-237, 2017
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Inhibition of Corrosion Carbon Steel in Various Acid Medium by an Expired or Unused Acidity Non Toxic Drugs
Suraj B. Ade*, N.V.Shitole
P.G.Department of Chemistry, Shri Shivaji College, Parbhani, India
Abstract : The inhibition effect of environmentally friendly and cost-effective drugs, on the corrosion of carbon steel in an acidic medium was studied by the weight loss method at room temperature. The study revealed that the test drug has an inhibitory action on the corrosion of carbon steel in the investigated medium. This paper presents use of expired or unused drugs as corrosion inhibitors for metals in 0.1N, 0.01N and 0.001N (HCl, HNO3 and H2SO4) acidic medium by an expired acidity non toxic drug’s. Thus inhibition efficiency was obtained of various acidity non toxic drugs.
Keywords : Corrosion, Inhibition, carbon steel, Weight loss and Expired acidity non toxic drug’s.
Introduction
The corrosion of metals remains a worldwide scientific problem as it affects the metallurgical, chemical, construction and oil industries. Most of the metals tend to corrode early due to their thermodynamic instability carbon steel is prominently used as structural, instrumental and industrial material, the prevention of its corrosion is very essential. Many experimental methods are employed to control the corrosion of mild steel. The use of inhibitor is one of the practical methods for preventing corrosion of carbon steel especially in acidic media.1.
Acid solutions are widely used in many industries, such as acid pickling, industrial acid cleaning, acid descaling and oil well acidizing2.The inhibitive reactivity of an inhibitor is fundamentally affected by the molecular structure of the inhibiting molecules3.Most prominent corrosion inhibitors are organic compounds containing nitrogen, sulphur, oxygen and phosphorus in their functional groups4-5. A large number of scientific studies have been devoted to the subject of corrosion inhibitors for mild steel in acidic media6-8. Few non toxic compounds have been investigated as corrosion inhibitors by some researches9-10. The aim of this research work is to investigate the inhibitive effect of carbon steel in different acid medium by various expired acidity non toxic drugs Rentidine, Zantac, Aciloc, Rentac, Omez using weight loss techniques.
In this experiment beakers were labeled from 1-54 and in beakers having labeled 1-6 20ml 0.1N HCl, 7-12 20ml 0.01N HCl, 13-18 20ml 0.001N HCl, in beakers 19-24 20ml 0.1N HNO3, 25-30 20ml 0.01N HNO3 and in beaker 31-36 20ml0.001N HNO3 and in beakers 37-42 20ml 0.1N H2SO4, 43-48 20ml 0.01N H2SO4, 49-54 20ml 0.001N H2SO4 were added.
After the preparation of the mixture solution in different labeled beaker, dipped binding wire pieces in each beakers for 48 hours. After 48 hours the wire pieces were taken out from the beaker. They were washed with water and dried at room temperature. Its weight was determined on analytical balance as final weight.
The loss in mass was determined using the relation.
X 100
I.E. =
Wi
Where,
I.E. = Inhibition efficiency.
Wu = weight loss of metal in control solution
Result and Discussion
Inhibition of corrosion carbon steel in various acidic medium by an expired acidity non toxic drug’s in 0.1N HNO3.(Table-1)
Compound |
Initial weight (W1) |
Final Weight (W2) |
Loss in weight (△W) |
% Loss in weight |
I.E. ( %) |
Control |
0.355 |
0.296 |
0.059 |
16.62 |
- |
A |
0.318 |
0.268 |
0.050 |
15.73 |
15.25 |
B |
0.297 |
0.257 |
0.040 |
13.47 |
32.20 |
C |
0.327 |
0.290 |
0.037 |
11.32 |
37.28 |
D |
0.319 |
0.309 |
0.010 |
03.14 |
83.05 |
E |
0.290 |
0.263 |
0.027 |
09.32 |
54.23 |
Fig. Variation of weight loss of mild steel in 0.1N HNO3 solution containing in different acidic medium by an expired acidity non toxic drug.(Graph-1)
Inhibition of corrosion mild steel in different acidic medium by an expired acidity non toxic drugs in 0.01N HNO3.(Table-2)
Compound |
Initial weight (W1) |
Final Weight (W2) |
Loss in weight (△W) |
% Loss in weight |
I.E. ( %) |
Control |
0.293 |
0.270 |
0.023 |
07.85 |
- |
A |
0.308 |
0.295 |
0.013 |
04.23 |
43.47 |
B |
0.316 |
0.297 |
0.019 |
06.02 |
17.39 |
C |
0.280 |
0.264 |
0.016 |
04.29 |
30.43 |
D |
0.294 |
0.285 |
0.009 |
03.07 |
77.77 |
E |
0.300 |
0.280 |
0.020 |
07.67 |
13.04 |
Fig. Variation of weight loss of mild steel in 0.01N HNO3 solution containing in various acidic medium by an expired acidity non toxic drug.(Graph-2)
Inhibition of corrosion mild steel in various acidic medium by an expired acidity non toxic drugs in 0.001N HNO3.(Table-3)
Compound |
Initial weight (W1) |
Final Weight (W2) |
Loss in weight (△W) |
% Loss in weight |
I.E. ( %) |
Control |
0.356 |
0.315 |
0.041 |
11.52 |
- |
A |
0.261 |
0.248 |
0.013 |
04.99 |
68.29 |
B |
0.304 |
0.284 |
0.020 |
06.57 |
51.12 |
C |
0.316 |
0.299 |
0.017 |
05.38 |
58.53 |
D |
0.320 |
0.310 |
0.010 |
03.13 |
75.60 |
E |
0.289 |
0.280 |
0.009 |
03.12 |
78.04 |
Fig. Variation of weight loss of mild steel in 0.001N HNO3 solution containing in different acidic medium by an expired acidity non toxic drug.(Graph-3)
Inhibition of corrosion mild steel in various acidic medium by an expired acidity non toxic drugs in 0.1N H2SO4.(Table-4)
Compound |
Initial weight (W1) |
Final Weight (W2) |
Loss in weight (△W) |
% Loss in weight |
I.E.(%) |
Control |
0.329 |
0.306 |
0.023 |
06.99 |
- |
A |
0.295 |
0.282 |
0.013 |
04.41 |
43.47 |
B |
0.348 |
0.333 |
0.015 |
04.31 |
34.78 |
C |
0.288 |
0.272 |
0.016 |
05.05 |
30.43 |
D |
0.298 |
0.291 |
0.007 |
02.35 |
69.56 |
E |
0.313 |
0.299 |
0.014 |
04.47 |
39.13 |
Fig. Variation of weight loss of mild steel in 0.1N H2SO4 solution containing in different acidic medium by an expired acidity non toxic drug.(Graph-4)
Inhibition of corrosion mild steel in various acidic medium by an expired acidity non toxic drugs in 0.01N H2SO4.(Table-5)
Compound |
Initial weight (W1) |
Final Weight (W2) |
Loss in weight (△W) |
% Loss in weight |
I.E.( %) |
Control |
0.324 |
0.294 |
0.030 |
09.25 |
- |
A |
0.297 |
0.287 |
0.010 |
03.36 |
66.66 |
B |
0.298 |
0.285 |
0.013 |
04.36 |
56.66 |
C |
0.312 |
0.300 |
0.012 |
03.85 |
60.00 |
D |
0.388 |
0.375 |
0.015 |
03.85 |
50.00 |
E |
0.298 |
0.278 |
0.020 |
06.71 |
33.33 |
Fig. Variation of weight loss of mild steel in 0.01N H2SO4 solution containing in different acidic medium by an expired acidity non toxic drug.(Graph-5)
Inhibition of corrosion mild steel in various acidic medium by an expired acidity non toxic drugs in 0.001N H2SO4. (Table-6)
Compound |
Initial weight (W1) |
Final Weight (W2) |
Loss in weight (△W) |
% Loss in weight |
I.E.( %) |
Control |
0.314 |
0.291 |
0.023 |
07.32 |
- |
A |
0.337 |
0.325 |
0.012 |
03.56 |
47.82 |
B |
0.303 |
0.296 |
0.009 |
02.30 |
60.86 |
C |
0.328 |
0.315 |
0.013 |
03.96 |
43.47 |
D |
0.295 |
0.281 |
0.014 |
04.75 |
39.13 |
E |
0.315 |
0.304 |
0.011 |
03.49 |
52.17 |
Fig. Variation of weight loss of mild steel in 0.001N H2SO4 solution containing in different acidic medium by an expired acidity non toxic drug.(Graph-6)
Inhibition of corrosion mild steel in various acidic medium by an expired acidity non toxic drugs in 0.1N HCl. (Table-7)
Compound |
Initial weight (W1) |
Final Weight (W2) |
Loss in weight (△W) |
% Loss in weight |
I.E. ( %) |
Control |
0.280 |
0.175 |
0.105 |
37.50 |
- |
A |
0.297 |
0.281 |
0.016 |
05.39 |
84.76 |
B |
0.299 |
0.285 |
0.014 |
04.68 |
86.66 |
C |
0.303 |
0.291 |
0.012 |
03.96 |
88.57 |
D |
0.353 |
0.342 |
0.011 |
03.11 |
89.52 |
E |
0.306 |
0.272 |
0.034 |
11.12 |
67.61 |
Fig. Variation of weight loss of mild steel in 0.1N HCl solution containing in different acidic medium by an expired acidity non toxic drug. (Graph-7)
Inhibition of corrosion mild steel in different acidic medium by an expired acidity non toxic drugs in 0.01N HCl.(Table-8)
Compound |
Initial weight (W1) |
Final Weight (W2) |
Loss in weight (△W) |
% Loss in weight |
I.E.( %) |
Control |
0.326 |
0.278 |
0.048 |
14.72 |
- |
A |
0.317 |
0.307 |
0.01 |
03.15 |
79.16 |
B |
0.328 |
0.321 |
0.007 |
02.13 |
85.41 |
C |
0.314 |
0.310 |
0.004 |
01.27 |
91.66 |
D |
0.364 |
0.355 |
0.009 |
02.47 |
81.25 |
E |
0.320 |
0.303 |
0.017 |
05.31 |
64.58 |
Fig. Variation of weight loss of mild steel in 0.01N HCl solution containing in various acidic medium by an expired acidity non toxic drug.(Graph-8)
Inhibition of corrosion mild steel in different acidic medium by an expired acidity non toxic drugs in 0.001N HCl.(Table-9)
Compound |
Initial weight (W1) |
Final Weight (W2) |
Loss in weight (△W) |
% Loss in weight |
I.E. ( %) |
Control |
0.326 |
0.277 |
0.049 |
15.03 |
- |
A |
0.282 |
0.265 |
0.017 |
06.03 |
65.30 |
B |
0.311 |
0.306 |
0.005 |
01.61 |
89.79 |
C |
0.363 |
0.352 |
0.011 |
03.03 |
77.25 |
D |
0.338 |
0.330 |
0.008 |
02.36 |
83.67 |
E |
0.294 |
0.284 |
0.01 |
03.40 |
79.59 |
Fig. Variation of weight loss of mild steel in 0.001N HCl solution containing in various acidic medium by an expired acidity non toxic drug.(Graph-9)
In this research work the inhibition of corrosion of carbon steel binding wire in various minerals acid medium by an expired acidity non-toxic drug’s were studied.
The inhibition effectiveness of Rentidine, Zantac, Rentac, Aciloc and Omez have been studied in regarding corrosion of mild steel in 0.1N, 0.01N 0.001N, HCl, HNO3 and H2 SO4 acidic medium.
Comp.B. Rentac shows I.E 83.05, 77.7 and 75.60 in 0.1, 0.01, and 0.001 N HNO3 acid medium. The comp. (E) Omez also shows higher I.E of Rentidine, Zantac & Aciloc compounds is having less I.E in 0.1, and 0.1, and 0.001N, HNO3 acid medium.
The I.E of Rentidine, Zantac & Aciloc drug’s compound is less in the dilution of 0.1N and 0.01N Nitric acid solution.
In the analysis of expired acidity non-toxic drug’s in sulphuric acid medium. The interesting results come out from the observation comp. D (Rentac) were shows 69.56% I.E in 0.1N H2SO4 acid medium.
Comp. A (Rentidine) has good result 66.66% I.E but shows less I.E below 50% in 0.1 N and 0.01N H2SO4 acid solution.
In certain comp. (B) Zantac and Comp. (C) - Aciloc exhibits I.E value 60.86% in 0.001 N H2 SO4 and also 60% in 0.01N sulphuric acid medium.
The most effective corrosion inhibition for the steel binding wire were observed with an expired acidity non-toxic drug’s comp. C- (Aciloc) I.E factor up to 91.66% in 0.01N HCl solution similarly other conc. of acid shows 88.57 in 0.1N HCl and 77.25 in 0.001 N HCl acid medium from the given observation from the given observation. The study of different acidity non-toxic drugs has been found good inhibitor for the mild steel in various HCl acid solutions. The I.E should follow the sequence i.e. HCl> HNO3> H2SO4.
The I.E increases with increase in conc. of acids. The corrosion process in inhibited by the adsorption these molecules on the steel binding wire. The various expired acidity non- toxic drug’s comp. containing active group which is responsible to inhibits corrosion of mild steel in different acidic medium. The inhibition performance of various expired acidity non- toxic drugs depends on the adsorption of its molecules on the metallic surface. The results determined by weight loss experimental techniques unconvincingly good agreements. The adsorption model obeys.
Conclusion
In the study of inhibition effect of an expired acidity non-toxic drug’s on the corrosion of mild steel in various acidic medium by weight loss technique at room temperature.Result obtained from experimental data shows that expired acidity non- toxic drugs Aciloc is good inhibitor for the corrosion of mild steel in 0.01 N HCl also comp.(D)- Rentac exhibits 83.05% I.E in 0.1N HNO3 comp. (E)- Omez shows 78.04% I.E in 0.001N HNO3 acidic medium comp. Zantac exhibits 66.66% efficiencies in 0.01N H2 SO4 .The different expired acidity non-toxic drug’s exhibits good I.E at 65 to 91% in all dilution of HCl, acidic medium solution. The results obtained from the observations table graphical methods & weight loss measurements are in good agreements with each other.
Acknowledgement
The authors are thankful to the principal of shri Shivaji College, parbhani for providing research facilities. Authors are also thankful to Head Department of chemistry providing necessary facilities and interpretation of corrosion activities.
References:
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