Role of current density in impress current cathodic protection of stainless steel in 3.5% NaCI solution / Justin Gerard K. Gerard

• Main Author: Justin Gerard, K. Gerard
• Format: Thesis
• Published: 2015
• Subjects: T Technology (General); TA Engineering (General). Civil engineering (General)
• Online Access: http://studentsrepo.um.edu.my/8341/6/Justin_Gerard_KMB130010_Role_of_Current_density_in_Impress_Current_Cathodic_Protection_of_Stainless_steel_in_3.5%2525NaCl.pdf; http://studentsrepo.um.edu.my/8341/

Impress current cathodic protections are common method of protecting steel structure from corrosion attack. The structure are supplied with cathodic current that reduced the corrosion rate. However if the magnitude of current supplied are insufficient, the structure will not be able to be protected and if the current supplied it too high, hydrogen embrittelement may occur. This research studies the effect of cathodic current density on stainless steel by electrochemical testing. A potentiodynamic polarisation test was conducted with stainless steel 316L and 304 in a 3.5% NaCl electrolytic solution. Stainless steel is resistance to corrosion in most atmospheric environment, nonetheless stainless steel is susceptible to pitting corrosion. The effect and the behaviour of stainless steel 316L and 304 under cathodic current are observed in this research as well. The metal surface was analysed by Scanning Electron Microscope and Energy Dispersive X-Ray. The test result indicate that pitting corrosion occur more in 304 stainless steel. On the other hand 316L stainless steel, show a more pitting resistance and slow cathodic rate.