1989/04/01 by Jalal Mohammed Saleh, J. M. Saleh, Yousif Kadim Al-Haidari
Materials Science · #Corrosion Behavior and Inhibition
paper · pdf · doi:10.1246/bcsj.62.1237
crossref issued 1989/04/01 · crossref published 1989/04/01 · openalex publication_date 1989/04/01 · crossref published-print 1989/04/15 · crossref published-online 2006/06/27 · crossref created 2006/07/26 · crossref deposited 2024/01/18 · openalex created_date 2025/10/10 · crossref indexed 2026/07/28 · openalex updated_date 2026/07/28
Abstract The corrosion behavior of stainless steel (405) specimen in 5 M H2SO4 solution has been investigated potentiostatically at four temperatures in the range 303–323 K. The inhibiting effects of ethanethiol (EtSH), dimethyl sulfide (Me2S), and dimethyl disulfide (Me2S2) have thereafter been tested for four inhibitor concentrations of 0.5, 1, 5, and 10 mmol dm−3. The sulfur compound addition to the H2SO4 solution caused a shift, mainly in the cathodic direction, of the corrosion potential, the electrode potential at low current densities as well as of the linear section of the cathodic Tafel line. The protection efficiency of each sulfur compound was determined at various temperatures and inhibitor concentrations. The sulfur compound acted as a corrosion inhibitor in the H2SO4 solution through adsorption on the stainless steel surface. The kinetic results, operating through a compensation effect, could well account for the variation of the inhibiting capacities of the various sulfur compounds. The results indicated that inhibition process involved the shift of the stainless steel corrosion to those surface sites which are associated with progressively higher energy of activation. EtSH was the most efficient of the three sulfur compounds for inhibiting the corrosion of the stainless steel in H2SO4 solution.