CorrosionThe destruction of a material or its properties because of a reaction with its (environment) surroundings. index established by the American Water Works Association (AWWAAmerican Water Works Association) Standard C-400; established as a criterion for determining the corrosive tendency of the water relative to asbestos-cement pipe; calculated from the pHA measure of the acidity or alkalinity of a solution. A value of seven is neutral; low numbers., calcium hardness (H), and total alkalinity (A) by the formula AI = pH + log (A * H).
