Chemical Technology October 2015

CORROSION & COATINGS

production capacity of million gallons of water per day. It produces 28×106MW/hour of electricity. These plants con- tribute to air pollution with the release of 282 955 thousand metric tons of CO 2 [5]. The shift from traditional designs to eco-friendly design is shown by the Carlsbad (California, USA) desalination plant. It has been designed to produce 13,5 kW/5 000 gallons of drinking water [6]. This plant is designed to reduce greenhouse carbon footprints by energy- effcient design, clean corrosion protection techniques, use of CO 2 for water production, CO 2 sequestration, and using warm water sources. By using warm cooling water, additional electrical energy savings of 12 208 MWH/yr and carbon dioxide footprint of 30 565 tons/year are predicted to be achieved. Clean water and superhydrophobic surfaces in heat exchanger tubes would have the capabilities to keep the tube surface ultraclean. Waste CO 2 releasing from chemical or other industries may be used in the desalination plants to make the design more eco-friendly. The above measures would reduce pollution in an area in icted with one of the harsh- est environments containing dangerous levels of aerosols. Water filtration Water quality directly affects the magnitude of corrosion. Replacement of old techniques by new technologies such

Corroded objects act synergistically to elevate pollution. Several metal ions interact with organic compounds such as humic acid and retard photocatalytic oxidation [4]. Corrosion prevention practices applied to power plants, desalination plants, transportation, aerospace, gas, oil, pet- rochemical and construction industries, need to bemodi ed to keep the environment green. No formal eco-friendly cor- rosion protection techniques have been reported by profes- sional corrosion organisations. The results obtained by the authors from their previous work and some work reported in the literature have prompted them to present an overview of some eco-friendly corrosion techniques which could be improved further to save the planet from the greenhouse and brown clouds effects. In spite of media’s commentaries and the Bush admin- istration’s rejection of global warming caused by carbon levels, Norway has installed third generation carbon seques- tration in the North Sea, while the USA has fallen behind in this critical technology. Eco-friendly techniques and their applications Desalination plants Saudi Arabia is now the largest producer of desalinated water in the world. It houses 30 desalination plants with a

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Chemical Technology • October 2015