Phenyltetrazole compounds inhibition influence on mild steel corrosion in acidic solution

• A.A. Mahmmod, M.K. Mohammed and M.A. Sultan

Chemical Engineering Department, Engineering College, University of Diyala, Iraq

Abstract: Inhibitors in general work to reduce the corrosion process in industrial sectors. Predominantly organic corrosion inhibitors, including phenyltrazole compounds, 5-(4-chlorophenyl)-1H-tetrazole ((CL-PT) and 5-(4-methoxyphenyl)-1H-tetrazole (MO-PT) & 5-phenyl-1H-tetrazole (PT) were employed in this work to protect mild steel or metal samples against corrosion in acidic medium (2.5% HCl). Experimentally, the research mainly studied the effect of an inhibitor type, phenyltetrazole compounds, as an corrosion inhibitor on mild steel exposure, using a weight loss technique as a means for measuring corrosion rate. We explored the weight loss measurements to monitor the corrosion rate and it was found that phenyltetrazole compounds worked efficiently in decreasing mild steel corrosion in hydrochloric acid medium. The corrosion-rate measurements were reported under an acidic medium at the concentration range of (0.001–0.004 M). The relationship between the inhibitors’ concentration and corrosion rate was measured at two different data sets for each inhibitor at 6 hours immersion time in corrosive media. The immersion time of all experiments was constant and the results gained from the present work showed that the corrosion rate decreased with an increase in an inhibitor concentration. The maximum effectiveness for the inhibitors reached up to a value of 95.0% at 0.004 M at 25°C & 6 hr immersion time of mild steel sample in the corrosive acid.

Keywords: corrosion, phenyltetrazole compounds, mild steel, weight loss technique, hydrochloric acid

Int. J. Corros. Scale Inhib., 2020, 9, no. 4, 1367-1374 PDF (289 K)
doi: 10.17675/2305-6894-2020-9-4-9

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