Chemical and Electrochemical Studies on Chromate Passivation of Brass

Brass is found to corrode by a process known as dezin-cification. There are three types of dezincification (i) Selective corrsosion of zinc in brass (ii)redeposition of copper on brass surface and (iii) a combination of proc-esses (i) and (ii). The corrosion is manifested on brass either as 'Layer type' when the attack is concentrated to points resulting in pitting and finally performation.