COPPER CORROSION IN ACIDS

Acid concentration is increases corrosion rate reaches a maximum another decreases .This is due to the fact that at very high concentration of acids ionization is reduced Because of this many of the common acids such as acetic acid, sulfuric, hydrofluoric as other are virtually inert in the pure state or 100% concentration at moderate temperature of grains Other differences in the metal can be chemical, metallurgical or mechanical in nature Examples arc impurities such as oxides and other inclusions mill scale, orientation dislocation arrays, differences in composition of the microstructure, precipitated phases, localized stresses, scratches and nicks. Highly polished surfaces are used in only special cases. Very pure materials are more corrosion resistant than commercial materials.