Corrosion behavior and inhibitive effects on organotin compounds on nickel in formic acid

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Corrosion (Houston); (United States)

DOI:https://doi.org/10.5006/1.3316086· OSTI ID:6098704

Singh, R N; Singh, V B ^[1]

---

1. Banaras Hindu Univ., Varanasi (India). Dept. of Chemistry

Corrosion behavior of nickel (Ni) in different compositions of formic acid (HCOOH) at 30C was studied using the potentiostatic polarization method. The shape of the polarization curve was evaluated, and the corrosion current density, critical current density, and passive current density were determined. HCOOH solution of different composition were aggressive for the anodic dissolution of Ni, except for 20 and 30 mol/O HCOOH, in which feeble passitivity was observed. The organometallic compounds dibutyltin dichloride, phenyltin trichloride, diphenyltin dichloride, and triphenyltin chloride ([C[sub 6]H[sub 5]][sub 3]SnCl), reduced the corrosion rate of Ni in 20 mol/O and 40 mol/O HCOOH. (C[sub 6]H[sub 5])[sub 3]SnCl was the most efficient. Inhibitive action was explained on the basis of adsorption following the Langmuir adsorption isotherm, with the highest surface coverage given by (C[sub 6]H[sub 5])[sub 3]SnCl. The inhibitive action of organometallic compounds toward Ni in HCOOH was caused by the phenyl group and delocalized [pi] electrons.

• OSTI ID: 6098704
• Journal Information: Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 49:7; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ADSORPTION
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CORROSION
CORROSION INHIBITORS
CORROSIVE EFFECTS
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
DATA
DISSOLUTION
ELECTRIC CURRENTS
ELEMENTS
EXPERIMENTAL DATA
FORMIC ACID
INFORMATION
METALS
MONOCARBOXYLIC ACIDS
NICKEL
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PASSIVATION
PERFORMANCE TESTING
SORPTION
TESTING
TIN COMPOUNDS
TRANSITION ELEMENTS