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APPENDIX A Definition of Terms PratettiM AliDd - A metallic object designed to corrode in place of the object it is designed to protect. Ca Pr4otectiOn1 - A technique to prevent the corrosion of a metal surface by making that surface the cathode of an electrocheinicaf cell_ Cement, Portland Cement - A cement that contains oxides of calcium,aluminum, iron, and silicon made by heating a mixture of limestone and clay in a kiln and pulverizing the resultant clinker, as defined in ASTM C150. Portland cement is also considered a hydraulic cement,because it must be mixed with water to form a cement-water paste with the ability to develop strength and harden, even under water. Centralizer - A device that assists in centering tubular materials in a borehole. Conductance,Specific-A measure of the ability of water to conduct electric current at 77 degrees Fahrenheit. It is related to the total concentration of ions in the water. Corrosion' - The deterioration of a material, usually a metal, because of a reaction with its environment. Drilling Fluid-A fluid (liquid or gas) used in drilling operations to remove cuttings from a borehole,to clean and cool the drilling bit, to reduce friction between the drill stem and the borehole wall, and, in some cases, to prevent caving or sloughing of the borehole. Electrolyte'-A chemical substance or mixture,usually liquid,containing ions that migrate in an electric field. The term electrolyte refers to the soil or liquid adjacent to, and in contact with a buried or submerged metallic structure including the moisture and other chemicals contained therein. Interference' -The situation that arises when a foreign substructure is affected in any way by a direct current source. Rectifier' - An electronic device that changes alternating current to direct current. Definition from National Association of Corrosion Engineers Standard RP-01-69 or RP-05-72. -77-