Cathodic protection using a photovoltaic source

Abstract

Metallic corrosion is a ubiquitous environmental problem that plagues industry. An exact accounting of the annual economic loss by the nations of the world to corrosion is not possible, but estimates have placed the figure as high as 1% of a nation's G.N.P. The annual loss to the United States due to corrosion of ferrous metals exceeds five billion dollars (1). Various techniques have been developed to combat this problem. The following demonstration presents a unique modification of previously published demonstrations on the corrosion and protection of ferrous metals (2-4). PreparationElectrodes: Cut 6 X 1-cm strips from steel ribbon used to band packages. Any protective bluing or oxidized coating should be removed by rinsing in 6 N HC1 and scouring with steel wool, then rinsing with water.Corrosion medium: Disperse 0.5-1.0 g of powdered agar in 100 ml distilled water, heat to boil with constant stirring, then add 1 g NaCl, 1 ml phenolphthalein indicator solution, and 1 ml of 0.1 M K3Fe(CN)6-Pour the warm agar solution into beakers and allow to gel. For overhead projection, the agar solution is poured into the bottom of a Petri dish and allowed to harden while the balance of the solution is kept warm. Bend to a right angle about 1 cm of the end of each electrode, place the electrodes on the hardened agar, and cover with more of the liquid agar, allowing the "ears" to extend upward out of

Capturing Solar Energy for Cathodic Protection of Metals: The Life of Photoexcited Charge Carriers

“…One can easily foresee that the recent advances in PECCP will largely broaden the application of photoelectric materials and relevant system designs. While Lauren [ 30 ] discussed the possibility of using commercial photovoltaic cells to supply the cathodic current in an ICCP system as early as 1978, it was not until 1995 that Yuan and Tsujikawa [ 31 ] demonstrated a “modern” PECCP system for the first time, with TiO 2 nanoparticles directly coated onto a Cu substrate via a sol–gel synthesis method, and systematically investigated the photoinduced cathodic protection effect of TiO 2 coating for the metal substrate. Following the early works, researchers have employed various strategies to boost the photoconversion performance of semiconductors used in PECCP systems ( Scheme ).…”

Review—Photoelectrochemical Cathodic Protection in The Dark: A Review of Nanocomposite and Energy-Storing Photoanodes

“…The first approach is well known and is currently practised by several industries, especially for the protection of metallic structures in remote areas where there is no grid electricity. [10][11][12][13][14][15][16][17][18] On the other hand, PECP is relatively a new approach that is currently not commercialised. PECP has attracted significant recent research attention as a potential eco-friendly substitute to conventional SACP.…”