Determination of corrosion rate by ac impedance

Journal Article · Fri Jul 01 04:00:00 EDT 1988 · Prot. Met. (Engl. Transl.); (United States)

OSTI ID:6095058

Novitskii, V S; Orishchenko, M Ya; Kuzub, V S

Computerized graphical and chemical analyses were used to study the effect of frequency on corrosion impedance for the systems: Armco iron/H/sub 2/SO/sub 4/ and St3 steel/H/sub 2/SO/sub 4/ with and without the addition of propargyl alcohol inhibitor, St3/NaCl, and St3/circulated water. The Epelboin equation for the effect of frequency on the impedance of anodic iron dissolution in sulfuric acid was confirmed between 10/sup /minus/2/ and 10/sup /minus/3/ Hz. The equation was analyzed theoretically. Corrosion rates found by extrapolating low-frequency conductance to zero frequency, with correction for nonlinearity, agreed with rates obtained gravimetrically with a root-mean-square deviation of no more than 20%. The impedance method was found to be useful for continuously monitoring corrosion rates in industry.

• OSTI ID: 6095058
• Journal Information: Prot. Met. (Engl. Transl.); (United States), Journal Name: Prot. Met. (Engl. Transl.); (United States) Vol. 23:6; ISSN PTNMA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALCOHOLS
ALKALI METAL COMPOUNDS
ALLOYS
CARBON STEELS
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COMPUTER CALCULATIONS
CORROSION
CORROSION INHIBITORS
CORROSION PROTECTION
CORROSIVE EFFECTS
DIFFUSION
DISSOLUTION
ELECTRIC IMPEDANCE
ELECTRIC MEASURING INSTRUMENTS
ELECTRICAL EQUIPMENT
ELECTROCHEMICAL CORROSION
ELECTRODES
ELEMENTS
EQUIPMENT
FREQUENCY DEPENDENCE
FREQUENCY MEASUREMENT
GRAVIMETRIC ANALYSIS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
IMPEDANCE
INORGANIC ACIDS
IRON
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
MEASURING INSTRUMENTS
METALS
MONITORING
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
REACTION KINETICS
SODIUM CHLORIDES
SODIUM COMPOUNDS
STEELS
SULFURIC ACID
TRANSITION ELEMENTS
WATER