The present study investigates the comparison between corrosion behavior of 2507 and 2205 DSS in artificial saliva for orthodontic wires. The heat treatment is necessary for 2507 and 2205 duplex stainless steel to remove or dissolve intermetallic phases, removed segregation and to relieve any residual thermal stress in DSS which may be formed during production processes. The corrosion behavior of a 2507 and 2205 DSS in artificial saliva was studied by SEM, HV test and potentiodynamic measurements. The results indicate that the corrosion resistance mainly depends on presence of secondary phases (sigma phase) and ferrite /austenite ratio, it’s revealed that the corrosion resistance of 2507 DSS higher than 2205 DSS in artificial saliva at 37 °C.
The duplex stainless SAF 2507 exhibit high corrosion resistance in artificial saliva and better than SAF 2205 before and after heat treatment.
The heat treatment is required for 2507 and 2205 DSS to break down or dissolve secondary phases, removed segregation and to relieve any residual thermal stresses, which may be formed during production processes. The optimum manipulation in both of heat treatment (ageing temperature and aging time) and chemical composition lead to significant reduction in sigma phase in microstructure of DSS.Prof. Dr. Eng Ali Sabea Hammood, PhD
J Mater Sci Mater Med 2017 Oct 17;28(12):187. Epub 2017 Oct 17.
Faculty of Dentistry, University of Kufa, Najaf, Iraq.
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