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Suitability of Nickel-based alloys and titanium for applications in acids at 200 °C

  • In the literature there are not much data available to describe the corrosion behavior of titanium, nickel alloys and special stainless steels in acids at high temperature, in particular above the boiling point. Therefore, a laboratory testing program was performed with two titanium alloys (grade 2 - UNS R50400 and grade 12 - UNS R53400) to obtain corrosion data in formic acid, acetic acid, phosphoric acid, polyphosphoric acid, p-toluene sulfonic acid and lactic acid at 200 °C. Results were compared to previously published ones obtained on alloy 31 (UNS N08031), alloy 59 (UNS N06059) and B-2 (UNS N10665). From the results it can be concluded that titanium does not always Show better corrosion resistance than Ni-based alloys, Alloy 59 was the best choice for formic and acetic acids at temperatures of 200°C. Both Ti-alloys are resistant in acetic acid. Some slight differences were observed for formic acid, where Ti grade 2 is only resistant up to a 20 % solution and grade 12 inIn the literature there are not much data available to describe the corrosion behavior of titanium, nickel alloys and special stainless steels in acids at high temperature, in particular above the boiling point. Therefore, a laboratory testing program was performed with two titanium alloys (grade 2 - UNS R50400 and grade 12 - UNS R53400) to obtain corrosion data in formic acid, acetic acid, phosphoric acid, polyphosphoric acid, p-toluene sulfonic acid and lactic acid at 200 °C. Results were compared to previously published ones obtained on alloy 31 (UNS N08031), alloy 59 (UNS N06059) and B-2 (UNS N10665). From the results it can be concluded that titanium does not always Show better corrosion resistance than Ni-based alloys, Alloy 59 was the best choice for formic and acetic acids at temperatures of 200°C. Both Ti-alloys are resistant in acetic acid. Some slight differences were observed for formic acid, where Ti grade 2 is only resistant up to a 20 % solution and grade 12 in concentrated acid too. The phosphoric acid is extremely corrosive and none of the investigated materials was resistant. In the diluted acid (5 %) only Ti grade 12 is resistant, whereas in 1 % solution all investigated materials withstand. Alloy B-2 and alloy 59 showed the best behavior in polyphosphoric acid. In 30 % concentrated p-toluene sulfonic acid at 200 °C all alloys tested were unsuitable. In very diluted acid (0.1 %) both Ti-alloys and the other three alloys behaved well. In lactic acid at 180 °C increased corrosion underneath deposits was detected; the best performance was observed for alloy 59 and Ti grade 2.zeige mehrzeige weniger

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Metadaten
Autor*innen:Ralph BäßlerORCiD, C. Schmidt, H. Alves
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Graue Literatur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Tagungsband zum VDM Symposium "Nickel alloys, titanium and zirconium in the chemical process industry"
Jahr der Erstveröffentlichung:2015
Erste Seite:paper 3
Freie Schlagwörter:Alloy 31 (UNS N08031); Alloy 59 (UNS N06059); Alloy B-2 (UNS N10665); Corrosion; Inorganic acids; Organic acids; Titanium grade 2 (UNS 50400); grade 12 (UNS 53400)
Veranstaltung:VDM Symposium "Nickel alloys, titanium and zirconium in the chemical process industry"
Veranstaltungsort:Frankfurt am Main, Germany
Beginndatum der Veranstaltung:17.06.2015
Enddatum der Veranstaltung:17.06.2015
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:10.11.2015
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