scholarly journals THE EFFECT OF TANNIN ON CARBON STEEL CORROSION IN NITRIC ACID SOLUTIONS

2015 ◽  
Vol 5 (1) ◽  
pp. 1
Author(s):  
Anna Sonya Asoka ◽  
Listiani Artha ◽  
Isdiriayani Nurdin ◽  
Hary Devianto
Keyword(s):  
Nitric Acid ◽  
Carbon Steel ◽  
Acid Solution ◽  
Corrosion Inhibitor ◽  
Nitric Acid Solution ◽  
Construction Material ◽  
Steel Corrosion ◽  
Corrosion Mechanism ◽  
Acid Solutions ◽  
Nitric Acid Solutions

Carbon steel is commonly used as construction material of processing equipment due to its strength, ease of fabrication, and low cost. Nevertheless, carbon steel is susceptible to corrosion by process fluid, like nitric acid. However, corrosion effect can be reduced by inhibitor addition. Tannin is one of carbon steel corrosion inhibitors in acidic solution. Tannin is an organic compound which has hidroxyl and carboxyl functional groups, decomposed easily, and non-toxic. The aim of this research is to determine the effectiveness of tannin as a corrosion inhibitor for carbon steel in nitric acid solutions. The corrosion rate is determined using the Tafel method, whereas the corrosion mechanism is predicted by cyclic voltammetry. The results showed that tannin is ineffective to inhibit carbon steel corrosion in nitric acid solution. The carbon steel corrosion reaction in nitric acid solution, with or without tannin addition, is reversible, involving single step oxidation-reduction reaction, resulting stable corrosion product, and not forming any passivation.Keywords: carbon steel, corrosion, inhibitor, nitric acid, tannin

scholarly journals The utilization demineralized rice husk waste for biofuel source via pyrolysis: thermogravimetric analysis and kinetic study

2019 ◽  
Vol 280 ◽  
pp. 05019
Author(s):  
Hesti Wijayanti ◽  
Iryanti Fatyasari Nata ◽  
Rinny Jelita
Keyword(s):  
Nitric Acid ◽  
Thermogravimetric Analysis ◽  
Acid Solution ◽  
Rice Husk ◽  
Nitric Acid Solution ◽  
Agricultural Waste ◽  
Solution Treatment ◽  
Strong Acid ◽  
Raw Material ◽  
Acid Solutions

Rice husk is considered as agricultural waste that causes environmental problem during its handling. In this study, rice husk was treated with acid (citric acid and nitric acid) solutions prior used as raw material for producing biofuel and chemicals via pyrolysis. The pyrolysis behaviors of rice husk treated with water and acid solutions have been investigated through thermogravimetric analysis from room temperature to 600 oC at the heating rate of 10oC/min under 50 ml/min nitrogen flow. Demineralization treatment using strong acid (nitric acid) solution showed more impacts to the rice husk in thermogravimetric analysis, i.e. lower ash content, less minerals content and thermal stability increased. One step model kinetic resulted the lowest activation energy (12.8709 kJ/mol) occured at the 5% nitric acid solution treatment. Excellent agreement between the experimental data and model predictions was found with 8.63% of the relative error. In other words, demineralization using 5% nitric acid solution would improve rice husk performance during its pyrolysis reaction for producing biofuel.

scholarly journals Unused Augmentin Drug as save corrosion inhibitor for α-brass in Nitric acid solution

2016 ◽  
Vol 57 (2) ◽  
pp. 326-338 ◽  
Author(s):  
Aziz Fouda ◽  
Salah Rashwan ◽  
Abd El-Aal ◽  
Naglaa Ramadan
Keyword(s):  
Nitric Acid ◽  
Acid Solution ◽  
Corrosion Inhibitor ◽  
Nitric Acid Solution
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