Sodium molybdate as a corrosion inhibitor of mild steel in natural waters Part 1: Flow rate effects

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

DOI:https://doi.org/10.5006/1.3316093· OSTI ID:6098675

Kolman, D G; Taylor, S R ^[1]

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1. Univ. of Virginia, Charlottesville, VA (United States). Center for Electrochemical Science and Engineering

Sodium molybdate (Na[sub 2]MoO[sub 4]) has been proposed as a possible replacement for chromate-based corrosion inhibitors for steel. Although Na[sub 2]MoO[sub 4] is used in industry, little characterization of its behavior in low-conductivity natural waters or under flowing conditions has been performed. Effects of flow rate and water treatment on ASTM A36 carbon steel (UNS K02600) in natural lake water has been examined by electrochemical impedance spectroscopy (EiS) using the rotating cylinder electrode technique. The corrosion behavior of A36 steel was found to be highly dependent upon flow rate in untreated natural water, but only moderately dependent upon flow rate in waters treated with Na[sub 2]MoO[sub 4], as determined by alternating and direct current methods. The electrochemical impedance spectra of steel in natural water were corrupted by artifacts at frequencies of 100 Hz and above. These artifacts were exacerbated by the low conductivity of the natural water. The solution and polarization resistances were isolated in the spectra in a series of experiments using solutions of different conductivities.

• OSTI ID: 6098675
• Journal Information: Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 49:8; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALLOYS
CARBON STEELS
COOLING SYSTEMS
CORROSION INHIBITORS
CORROSION PROTECTION
ELECTRIC CONDUCTIVITY
ELECTRIC IMPEDANCE
ELECTRICAL PROPERTIES
ENERGY SYSTEMS
FLOW RATE
IMPEDANCE
IRON ALLOYS
IRON BASE ALLOYS
LAKES
MATERIALS TESTING
MOLYBDATES
MOLYBDENUM COMPOUNDS
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SODIUM COMPOUNDS
SPECTROSCOPY
STEELS
SURFACE WATERS
TESTING
TRANSITION ELEMENT COMPOUNDS
WATER TREATMENT