7. Which of the following descriptions most precisely lays out the difference of erosion- corrosion (EC) from stress-corrosion (SC) of a metallic material? a. EC happens on surface whereas SC in the bulk. b. EC is caused by mechanical wear whereas SC by compression. C. EC is the result of chemical attack whereas SC the result of penetration of corrosion substances. d. EC is promoted by mechanical wear whereas SC by tensile stress.

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Corrosion control methods

Corrosion may be defined as the method in which metals are attacked on their exteriors by gases existing in the atmosphere, converting them to their oxides, nitrides, sulfides, etc.