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Recent experiences on suitability of titanium and high alloyed materials 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 (UNS R50400 and 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 UNS N08031, UNS N06059 and UNS N10665. From the results it can be concluded that titanium does not always show better corrosion resistance than Ni-based alloys. UNS N06059 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 UNS R50400 is only resistant up to a 20 % solution and UNS R53400 in concentrated acid too. The phosphoric acid isIn 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 (UNS R50400 and 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 UNS N08031, UNS N06059 and UNS N10665. From the results it can be concluded that titanium does not always show better corrosion resistance than Ni-based alloys. UNS N06059 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 UNS R50400 is only resistant up to a 20 % solution and UNS R53400 in concentrated acid too. The phosphoric acid is extremely corrosive and none of the investigated materials was resistant. In the diluted acid (5 %) only UNS R53400 is resistant, whereas in 1 % solution all investigated materials performed satisfactory. UNS N10665 and UNS N06059 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 UNS N06059 and UNS R50400.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):NACE International corrosion conference 2015 (Proceedings)
Jahr der Erstveröffentlichung:2015
Herausgeber (Institution):NACE International
Erste Seite:paper 5658, S. 1
Letzte Seite:13
Freie Schlagwörter:Corrosion; Inorganic acids; Organic acids; Titanium grade 2 (UNS 50400); alloy 31 (UNS N08031); alloy 59 (UNS N06059); alloy B-2 (UNS N10665); grade 12 (UNS 53400)
Veranstaltung:NACE International Corrosion Conference 2015
Veranstaltungsort:Dallas, TX, USA
Beginndatum der Veranstaltung:15.03.2015
Enddatum der Veranstaltung:19.03.2015
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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