A new look at molybdate

Journal Article · Fri May 01 04:00:00 EDT 1992 · Materials Performance; (United States)

OSTI ID:7294540

Jefferies, J; Bucher, B ^[1]

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1. Gulf Coast Chemical Co., Houston, TX (US)

The investigation of the use of molybdate as a cooling water corrosion inhibitor has increased recently driven primarily by environmental considerations. There are several other reasons to consider molybdate-based treatments that have been overlooked because of performance evaluation techniques that do not reveal the best qualities of molybdate. Conventional thinking seems to be as follows: molybdate (as MoO{sub 4}) requires oxygen or an oxidizing agent to function as a corrosion inhibitor; conventional laboratory equipment used to evaluate corrosion inhibitors scores molybdate a weak anodic inhibitor; zinc improves the performance of molybdate; most technical data sources report performance based on measured general corrosion rates; molybdate has been found within the anodic area of concentration corrosion cells (tubercles); as a result of environmental acceptability, interest in molybdate has increased despite its expense. An evaluation of molybdate as a cooling water inhibitor has revealed some surprising performance characteristics. Hypotheses for these mechanisms are presented.

• OSTI ID: 7294540
• Journal Information: Materials Performance; (United States), Journal Name: Materials Performance; (United States) Vol. 31:5; ISSN 0094-1492; ISSN MTPFB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CHEMICAL COMPOSITION
CHEMISTRY
COOLING SYSTEMS
CORROSION INHIBITORS
EVALUATION
MOLYBDATES
MOLYBDENUM COMPOUNDS
OXYGEN COMPOUNDS
PERFORMANCE
REFRACTORY METAL COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WATER CHEMISTRY