Inhibiting action of N-Napthyl-Nl-Phenyl thiourea on the corrosion of 304 Ss In HCL medium

Nagaraja Shetty, Ramadev Herle

Research output: Contribution to journalArticlepeer-review


304 SS is a highly prominent material that is commonly used in industries. Since, it is highly susceptible to corrosion, predominantly in aqueous medium; the study on the corrosion behaviour of 304 SS is the need of an hour for improving the quality and reliability of products and services. It is well-known that corrosion inhibition is one of the mechanisms used in the manufacturing sectors for mitigating the corrosion of metals and alloys. Hence, the present work aims to study the inhibiting effect of N-napthyl-Nl-phenyl thiourea (NPTU) on the corrosion of 304 SS in 1M HCl using Tafel extrapolation and impedance spectroscopy methods. The study reveals that the compound investigated acts as a mixed inhibitor for steel corrosion in hydrochloric acid medium and gives a sensibly good inhibition efficiency (>77%). The study also reveals that the compound NPTU inhibits the corrosion of 304 SS through adsorption and film formation mechanism. The mechanism of adsorption of the compound follows Temkin's isotherm model and the inhibition is governed by physical adsorption along with a weak chemical bonding.

Original languageEnglish
Pages (from-to)507-515
Number of pages9
JournalInternational Journal of Civil Engineering and Technology
Issue number2
Publication statusPublished - 01-02-2018

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Civil and Structural Engineering
  • Building and Construction
  • Metals and Alloys


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