Título

ON THE APPLIED POTENTIAL AND CHLORIDE ION CONCENTRATION FOR CRITICAL PITTING TEMPERATURE POTENTIOSTATIC DETERMINATION OF A DUPLEX STAINLESS STEEL

ON THE APPLIED POTENTIAL AND CHLORIDE ION CONCENTRATION FOR CRITICAL PITTING TEMPERATURE POTENTIOSTATIC DETERMINATION OF A DUPLEX STAINLESS STEEL

Autoria

Magnabosco, Rodrigo

Magnabosco, Rodrigo

Eu sou esse autor

DOI

10.5151/2594-5327-34830

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Resumo

THE INFLUENCE OF THE APPLIED POTENTIAL AND THE CONCENTRATION OF CHLORIDE IONS ON THE DETERMINATION OF THE CRITICAL PITTING TEMPERATURE (CPT) OF UNS S31803 DUPLEX STAINLESS STEEL (DSS) BY POTENTIOSTATIC POLARIZATION TECHNIQUE WAS STUDIED. APPLIED POTENTIALS FOR THE POTENTIOSTATIC POLARIZATION TESTS (BETWEEN 300 AND 800 MVAG/AGCL) WERE CHOSEN AMONG A PASSIVE COMMON RANGE OBSERVED IN POTENTIODYNAMIC POLARIZATION CURVES OBTAINED FOR CHLORIDE IONS CONCENTRATIONS FROM 0,3 TO 5 M, AT ROOM TEMPERATURE. THE DETERMINATION OF CPT UNDER LOWER APPLIED POTENTIALS AND CHLORIDE CONCENTRATIONS SHOWED HIGHER DEPENDENCE OF CHLORIDE CONCENTRATION AND APPLIED POTENTIAL. CPT WITH THE SMALLEST DISPERSION OF RESULTS WERE OBTAINED AROUND 50 °C UNDER THE MOST AGGRESSIVE CONDITIONS, AND CPT CAN BE CONSIDERED CHLORIDE ION CONCENTRATION AND POTENTIAL INDEPENDENT UNDER SPECIFIC TESTING CONDITIONS: 600 MVAG/AGCL AT 5 M NACL, 700 MVAG/AGCL AT 3 M NACL OR 5 M NACL AND 800 MVAG/AGCL.

THE INFLUENCE OF THE APPLIED POTENTIAL AND THE CONCENTRATION OF CHLORIDE IONS ON THE DETERMINATION OF THE CRITICAL PITTING TEMPERATURE (CPT) OF UNS S31803 DUPLEX STAINLESS STEEL (DSS) BY POTENTIOSTATIC POLARIZATION TECHNIQUE WAS STUDIED. APPLIED POTENTIALS FOR THE POTENTIOSTATIC POLARIZATION TESTS (BETWEEN 300 AND 800 MVAG/AGCL) WERE CHOSEN AMONG A PASSIVE COMMON RANGE OBSERVED IN POTENTIODYNAMIC POLARIZATION CURVES OBTAINED FOR CHLORIDE IONS CONCENTRATIONS FROM 0,3 TO 5 M, AT ROOM TEMPERATURE. THE DETERMINATION OF CPT UNDER LOWER APPLIED POTENTIALS AND CHLORIDE CONCENTRATIONS SHOWED HIGHER DEPENDENCE OF CHLORIDE CONCENTRATION AND APPLIED POTENTIAL. CPT WITH THE SMALLEST DISPERSION OF RESULTS WERE OBTAINED AROUND 50 °C UNDER THE MOST AGGRESSIVE CONDITIONS, AND CPT CAN BE CONSIDERED CHLORIDE ION CONCENTRATION AND POTENTIAL INDEPENDENT UNDER SPECIFIC TESTING CONDITIONS: 600 MVAG/AGCL AT 5 M NACL, 700 MVAG/AGCL AT 3 M NACL OR 5 M NACL AND 800 MVAG/AGCL.

Palavras-chave

Duplex stainless steels; critical pitting temperature; potentiostatic polarization

Duplex stainless steels; critical pitting temperature; potentiostatic polarization