| Improve the Corrosion Resistance of Mild Steel in a Dichloroisocyanuric Acid Solution |
| Paper ID : 1024-ICEE (R2) |
| Authors: |
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Mohamed Sheashea *1, Mohamed Gobara2, basem zaghloul1 1Military Technical College 2Chemical Engineering, MTC |
| Abstract: |
| The serious results of the corrosion process have become a major problem worldwide. One of the corrosion damage aspects are related to decontamination solutions which are essential for rapid degradation of toxic agents. The decontamination solutions should be non-corrosive to avoid deterioration of steel container. Decontamination solutions comprising have high chlorinating activity so they have a corrosive effect on mild which are used in fabrication of storage tanks. One of the effective methods used to decrease the corrosion rate, in this case, is the use of inhibitors. This work describes the effect of different compounds; (zinc chromate, cinnamaldehyde, sodium tripolyphosphate, zinc ortho-phosphate, ammonium molybdate and thiourea) on the corrosion rate of mild steel in dichloroisocyanuric acid decontamination solution. Using weight loss technique, three compounds namely; zinc chromate, cinnamaldehyde and thiourea, proved to be acceptable inhibitors for mild steel in 0.5 % dichloroisocyanuric acid solution. Meanwhile, these inhibitors should not affect active chlorine content which is responsible for the decontamination process. By using AquaChec® and kelthoff methods for measuring active chlorine, it was found that only zinc chromate passed the tests. For measuring electrochemical behaviour of mild steel in decontamination solutions, different techniques were used. The adsorption and inhibition effect of zinc chromate on mild steel in 0.5 % dichloroisocyanuric acid solution at different temperatures (283–313 K) were studied using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy. The results obtained show that zinc chromate acts as an effective corrosion inhibitor for mild steel in dichloroisocyanuric acid and inhibition efficiency reaches 96 % at inhibitor concentration of 0.005 M. Inhibition efficiency was found to increase with increase in zinc chromate concentration suggesting both physisorption and chemisorption process. This result was confirmed by finding that the corrosion inhibition efficiency was not affected significantly with temperature increase. |
| Keywords: |
| Dichloroisocyanuric acid - Corrosion - Inhibitiors - Zinc Chromate - Mild Steel |
| Status : Paper Accepted |
