Effect of ozone on corrosion of metals used in cooling towers
- Nalco Chemical Co., Naperville, IL (United States). One Nalco Center
The effect of dissolved ozone on the corrosion of mild steel copper (Cu), 90 Cu-10 Ni (nickel), 70 Cu-30 Ni, and admiralty in typical cooling tower waters with different solute contents was studied using electrochemical techniques. Results showed ozone at typical usage (0.1 to 0.2 mg) had no significant effect on the anodic passivation of mild steel. In general, corrosion in the presence of ozone was dictated by water chemistry. In supersaturated solution, general corrosion was suppressed by a layer of insulating mineral scale on the surface, regardless of the presence of ozone. In some solutions, however, high localized corrosion rates were observed both when ozone was present and when ozone was absent. In solution with low levels of Ca[sup 2+] and HCO[sub 3][sup [minus]], corrosion rates much higher than industry standard were observed with or without ozone. In a non-scaling, medium hardness water, ozone generally increased the corrosion rates of all yellow metals, especially at high concentration or under conditions with high mass transfer rate. The presence of 1 mg ozone had the greatest corrosive effect on Cu, with lesser effects on 90 Cu-10 Ni and 70 Cu-30 Ni and even less effects on admiralty.
- OSTI ID:
- 6268026
- Journal Information:
- Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 49:6; ISSN 0010-9312; ISSN CORRAK
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
200101 -- Fossil-Fueled Power Plants-- Cooling & Heat Transfer Equipment & Systems
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BRASS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHEMICAL REACTIONS
CHEMISTRY
COOLING TOWERS
COPPER
COPPER ALLOYS
COPPER BASE ALLOYS
CORROSION
CORROSIVE EFFECTS
DATA
DISSOLVED GASES
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
METALS
NICKEL ALLOYS
NUMERICAL DATA
OXYGEN COMPOUNDS
OZONE
PASSIVATION
SOLUTES
STEELS
TRANSITION ELEMENTS
WATER CHEMISTRY
ZINC ALLOYS