A mechanistic study of the oxidative addition reaction of benzyl thiocyanate at iron, nickel, and zinc surfaces in sulfuric acid

Tetsuya Suzuki, Hiroshi Nishihara, Kunitsugu Aramaki

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Reactions of benzyl thiocyanate at Fe, Ni, and Zn surfaces in sulfuric acid were studied in relation to the corrosion inhibition behavior of benzyl thiocyanate. Corrosion inhibition efficiency obtained by the electrochemical polarization method was extremely high for Fe and Ni but modest for Zn. Benzyl thiocyanate decomposed at these three metal surfaces, and the decay kinetics, which was first order in benzyl thiocyanate, was slow on Fe and Ni but fast on Zn. Formation of a multiple-layer film on the metals was indicated from the amount of benzyl thiocyanate consumed when the metals contact with the benzyl thiocyanate solution. Thiocyanate ion, benzaldehyde, toluene, and benzyl mercaptan were detected as the reaction products. Benzaldehyde was mainly formed on Fe and Ni, while toluene and benzyl mercaptan were the major products on Zn. Conclusions on the reaction mechanism deduced from these results are as follows: oxidative addition of benzyl thiocyanate to the surface metal atoms forms a multiple-layer film on the surface which is resistive against the metal corrosion; the reaction products on Fe and Ni consist of an η;3-benzyl-metal π-binding, whereas the product on Zn is composed of an η1-benzyl-Zn σ-bonding; and the high stability of the π-bonding of benzyl ligand with Fe and Ni gives the excellent corrosion protection ability.

Original languageEnglish
Pages (from-to)816-821
Number of pages6
JournalLangmuir
Volume6
Issue number4
Publication statusPublished - 1990

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Addition reactions
sulfuric acid
Nickel
Sulfuric acid
Zinc
corrosion
Iron
zinc
nickel
iron
Metals
thiols
reaction products
metal surfaces
toluene
Corrosion
Reaction products
Toluene
metals
Sulfhydryl Compounds

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

A mechanistic study of the oxidative addition reaction of benzyl thiocyanate at iron, nickel, and zinc surfaces in sulfuric acid. / Suzuki, Tetsuya; Nishihara, Hiroshi; Aramaki, Kunitsugu.

In: Langmuir, Vol. 6, No. 4, 1990, p. 816-821.

Research output: Contribution to journalArticle

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