Investigation of some green compounds as corrosion and scale inhibitors for cooling systems
- Aligarh Muslim Univ. (India)
The performance of an open-recirculating cooling system, an important component in most industries, is affected by corrosion and scale formation. Numerous additives have been used in the past for the control of corrosion and scale formation. Effects of the naturally occurring compounds azadirachta indica (leaves), punica granatum (shell), and momordica charantia (fruits), on corrosion of mild steel in 3% sodium chloride (NaCl) were assessed using weight loss, electrochemical polarization, and impedance techniques. Extracts of the compounds exhibited excellent inhibition efficiencies comparable to that of hydroxyethylidine diphosphonic acid (HEDP), the most preferred cooling water inhibitor. The compounds were found effective under static and flowing conditions. Extracts were quite effective in retarding formation of scales, and the maximum antiscaling efficiency was exhibited by the extract of azadirachta indica (98%). The blowdown of the cooling system possessed color and chemical oxygen demand (COD). Concentrations of these parameters were reduced by an adsorption process using activated carbon as an adsorbent.
- OSTI ID:
- 6336186
- Journal Information:
- Corrosion, Vol. 55:5; ISSN 0010-9312
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
COOLING SYSTEMS
CORROSION INHIBITORS
CORROSION PROTECTION
ELECTROCHEMISTRY
ENVIRONMENTAL MATERIALS
INDUSTRIAL PLANTS
SODIUM CHLORIDES
STEELS
WEIGHT
ALKALI METAL COMPOUNDS
ALLOYS
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
ENERGY SYSTEMS
HALIDES
HALOGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
SODIUM COMPOUNDS
360105* - Metals & Alloys- Corrosion & Erosion
320202 - Energy Conservation
Consumption
& Utilization- Transportation- Railway