Inhibition of steel corrosion by thiourea derivatives

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

DOI:https://doi.org/10.5006/1.3316074· OSTI ID:6239602

Singh, I ^[1]

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1. National Metallurgical Lab., Jamshedpur (India)

The thiourea group of sulfur compounds has important theoretical and practical applications. Thioureas have been studied extensively, but their inhibition mechanism is not fully understood. The effect of thiourea; allylthiourea; N,N[prime]-diethylthiourea; N,N[prime]-di-isopropylthiourea; phenylthiourea; thiocarbanilide; and symdiotolylthiourea on the corrosion reaction and on the amount of H[sub 2] absorbed by cold-rolled mild steel in 1 N H[sub 2]SO[sub 4] at 40 C was studied. Inhibitor efficiency increased with increases in molecular weight and inhibitor concentration. Higher inhibitor concentrations decreased H[sub 2] pickup. Thiourea accelerated corrosion reactions and H[sub 2] pickup at higher concentrations. Potential studies showed cathodic reactions were inhibited at lower concentrations and anodic reactions were inhibited at higher concentrations. Results were based on the adsorption theory, and all inhibitors studied followed the Langmuir isotherm.

• OSTI ID: 6239602
• Journal Information: Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Journal Issue: 6 Vol. 49:6; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ADSORPTION
ADSORPTION ISOTHERMS
ALLOYS
ANTITHYROID DRUGS
CARBONIC ACID DERIVATIVES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CONCENTRATION RATIO
CORROSION
CORROSION INHIBITORS
CORROSION PROTECTION
DATA
DRUGS
ELEMENTS
EXPERIMENTAL DATA
HORMONE ANTAGONISTS
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
IRON ALLOYS
IRON BASE ALLOYS
ISOTHERMS
KINETICS
MOLECULAR WEIGHT
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PERFORMANCE TESTING
REACTION KINETICS
SAMPLE PREPARATION
SORPTION
STEELS
SULFURIC ACID
TESTING
THIOUREA
THIOUREAS