CORROSION ASSESSMENT OF SINTER DUPLEX STAINLESS STEEL COMPOSITES IN PINEAPPLE JUICE EXTRACT

• O OLANIRAN

  Metallurgical & Materials Engineering Department, Federal University of Technology, Akure, Nigeria

• J O BORODE

  Metallurgical & Materials Engineering Department, Federal University of Technology, Akure, Nigeria

• A E AFOLABI

  Metallurgical & Materials Engineering Department, Federal University of Technology, Akure, Nigeria

• P A OLUBAMBI

  Applied Microscopy & Triboelectrochemical Research Laboratory, Tshwane University of Technology, Pretoria, South Africa

• B A OLANIRAN

  Computer Communication Department, Texas Tech University, Lubbock Texas, USA.

• D O FOLORUNSO

  Applied Microscopy & Triboelectrochemical Research Laboratory, Tshwane University of Technology, Pretoria, South Africa

Corrosion behavior of sintered oxide dispersion strengthened duplex stainless steel composites in pineapple juice extract was investigated using weight loss and potentio-dynamic methods. The scope of the work includes investigations  on the effects of alloying elements, grain growth inhibitors, varying reinforceing ceramics starting powders. The sinter oxide dispersion strengthened (ODS) samples were characterized, using a combination of varying analytical techniques; scanning electron microscopy (SEM) and x-ray diffractometer (XRD). Gravimetric method is based on weight loss measurement while potentio-dynamic polarization scanning was done using an autolab potentiostat (PGSTAT 204 computer controlled) using the general purpose electrochemical software (GPES) version 1.10. Potentio-dynamic polarization curves were collected by scanning the potential from -1.0 to +1.5 V against Ag/AgCl at a scan rate of 2.0 mV/s. All electrochemical measurements were performed at room temperature in naturally aerated solutions. It was also observed that corrosion rate by gravimetric and polarization scanning provides relatively the same trend of information. Corrosion pits originated from the residual pores and grow as a result of weakening effect by the environment. Inclusions of partially Stabilized Zirconia (PSZ) help prevent further growth of the pits.

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