Passivity breakdown characteristics of Cr steels have been studied by adding chloride ions progressively in sulfuric acid solutions. Effects of holding time at different potentials on the film growth have also been studied by adding a fixed quantity of chloride ions in sulfuric acid solution after a passive layer has been formed. Comparative study of corrosion kinetics has been made for different modes of ex-perimentation. SEM studies have also been done to examine the nature of breakage of passive layers.
(Received October 1, 1986)
Keywords: passivity breakdown, progressive addition of chloride ions effect on, corrosion kinetics, critical amount of chloride ion addition
* Department of Metallurgical Engineering, Jadavpur University, Calcutta-32, India.
** Department of Metallurgical Engineering, Indian Institute of Technology, Kharagpur-721302, India. The work has been carried out at Dept. of Met. Eng., Jadavpur University.