Electrochemical studies of inhibitors in aqueous slurries of sand, iron ore, and coal

Journal Article · Mon Oct 01 04:00:00 EDT 1979 · Corrosion; (United States)

DOI:https://doi.org/10.5006/0010-9312-35.10.475· OSTI ID:5950020

Postlethwaite, J

An electrochemical technique has been used to measure the efficiency of corrosion inhibitors in controlling the corrosion of carbon steel in a 5 cm diameter pilot plant slurry pipeline. Aqueous slurries of silica sand, thermal coal, and iron ore concentrate were studied. The inhibitors were: K/sub 2/Cr/sub 2/O/sub 7/; Na/sub 5/P/sub 3/O/sub 10/; (NaPO/sub 3/)n; Zn/sup + +/; and N(CH/sub 2/PO(OH)/sub 2/)/sub 3/. The results of this electrochemical screening show that the chromate, at concentrations > 30 g/m/sup 3/ is most effective inhibitor. The corrosion potentials with the inhibitor added were in the active region, and the chromate was apparently acting as a cathodic inhibitor. The phosphonate was effective with the iron ore concentrate slurry, but not with the coarser coal and sand slurries.

• Research Organization: Univ. of Saskatchewan, Saskatoon
• OSTI ID: 5950020
• Journal Information: Corrosion; (United States), Journal Name: Corrosion; (United States) Vol. 35:10; ISSN CORRA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
013000 -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALLOYS
CARBON STEELS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COAL
COMPLEXES
CORROSION
CORROSION INHIBITORS
DISPERSIONS
EFFICIENCY
ENERGY SOURCES
FOSSIL FUELS
FUELS
IRON ALLOYS
IRON BASE ALLOYS
IRON ORES
MIXTURES
ORES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOSPHORUS COMPLEXES
PHOSPHORUS COMPOUNDS
PHOSPHORUS OXIDES
PIPELINES
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
SAND
SLURRIES
SODIUM COMPOUNDS
SODIUM OXIDES
STEELS
SUSPENSIONS
TRANSITION ELEMENT COMPOUNDS
WEAR