Corrosion control and protection

This book extrapolates on Corrosion as the destructive attack of a metal by chemical or electrochemical reaction with its environment. Deterioration by physical causes is not called corrosion but is described as erosion galling or wear. In some instances chemical attack accompanies physical deterioration as described by the following terms: corrosion – erosion corrosive wear or fretting corrosion. Nonmetals are not included in this definition of corrosion. Plastics may swell or crack wood may split or decay granite may erode and Portland cement may leach away but the term corrosion in this book is restricted to chemical attack of metals. “Rusting” applies to the corrosion of iron or iron - base alloys with formation of corrosion products consisting largely of hydrous ferric oxides. Nonferrous metals therefore corrode but do not rust.