Cyclic polarization study of thick welded joints of lean duplex stainless steel for application in biodiesel industry.
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Date
2017
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Abstract
Thick welded joints of UNS S32304 lean duplex stainless steel (LDSS) has been studied in acidified
glycerin, a byproduct of biodiesel plants, using cyclic polarization technique. LDSS S32304 thick
plates were welded by different processes commonly employed in the fabrication process: shielded
metal arc welding, gas metal arc welding and flux cored arc welding. The electrochemical behavior of
different weldment zones was characterized. Transmission electron microscopy and scanning electron
microscopy (SEM) were used for sample characterization. SEM images showed that the heat affected
zone was the most critical zone for pitting corrosion for all samples. The results were associated to
the microstructural features of the materials. Generally, the breakdown potential of the top regions of
welds was higher in acidified glycerin than the weld root for welds fabricated with two different filler
metals. Basically, all the welded samples exhibited similar or higher corrosion resistance, compared
with the corresponding base metal.
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Keywords
Corrosion, Acidified glycerin, Duplex stainless steel, Welding process
Citation
SICUPIRA, D. C. et al. Cyclic polarization study of thick welded joints of lean duplex stainless steel for application in biodiesel industry. Materials Research, São Carlos, v. 20, n. 1, p. 161-167, jan./fev. 2017. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000100161>. Acesso em: 15 set. 2017.