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51317--9781-Investigation the Pitting Resistance of SS304 and SS316L in Neat Chemical Products Using EIS

Corrosion behavior of austenitic stainless steel UNS S30400 (SS304) and austenitic stainless steel UNS S31603 (SS316L) was investigated to confirm, for the same chemicals and metallurgies, that electrochemical impedance spectroscopy (EIS) could be used as a tool to investigate the compatibility of neat chemical with stainless steels. 

 

Product Number: 51317--9781-SG
ISBN: 9781 2017 CP
Author: Yolanda De Abreu
Publication Date: 2017
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$20.00
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Corrosion behaviour of austenitic 304 stainless steel (SS304) and 316L stainless steel (SS316L) in the presence of neat chemical products was investigated. The electrochemical properties of 304 and 316L stainless steel were assessed using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) for different immersion time and different potential applied.It was corroborated that the criteria used to determine the chemical compatibility for SS316L could be also implemented to evaluate the compatibility with SS304: A pitting potential greater than 200 mV (vs. OCP) and current density less than 5 mA/cm-2 at 150 mV. Both criteria need to be met in order to deem a chemical product as compatible with the metallurgy. A polarization resistance (Rp) determined from the impedance diagram higher than 8500 ?ž.cm2 obtained at 200 mV above the open circuit potential suggested high resistance of the passive film. Flags about the presence of pits at 200 mV were suggested by a polarization resistance value lower than 8500 ?.žcm2. No conclusive results could be obtained from Rp of different immersion tests at the OCP.Key words: SS304 SS316L chemical compatibility EIS cyclic polarization pitting polarization resistance passivation neat products.

Key words: SS304, SS316L, chemical compatibility, material compatibility, EIS, cyclic polarization, pitting, polarization resistance, passivation, neat chemical products

Corrosion behaviour of austenitic 304 stainless steel (SS304) and 316L stainless steel (SS316L) in the presence of neat chemical products was investigated. The electrochemical properties of 304 and 316L stainless steel were assessed using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) for different immersion time and different potential applied.It was corroborated that the criteria used to determine the chemical compatibility for SS316L could be also implemented to evaluate the compatibility with SS304: A pitting potential greater than 200 mV (vs. OCP) and current density less than 5 mA/cm-2 at 150 mV. Both criteria need to be met in order to deem a chemical product as compatible with the metallurgy. A polarization resistance (Rp) determined from the impedance diagram higher than 8500 ?ž.cm2 obtained at 200 mV above the open circuit potential suggested high resistance of the passive film. Flags about the presence of pits at 200 mV were suggested by a polarization resistance value lower than 8500 ?.žcm2. No conclusive results could be obtained from Rp of different immersion tests at the OCP.Key words: SS304 SS316L chemical compatibility EIS cyclic polarization pitting polarization resistance passivation neat products.

Key words: SS304, SS316L, chemical compatibility, material compatibility, EIS, cyclic polarization, pitting, polarization resistance, passivation, neat chemical products

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