Some different types of organic substances (an acetylenic derivative, S- or N-containing compounds) were tested as inhibitors for the intergranular (IG) corrosion of a sensitized AISI 304 stainless steel, in diluted sulphuric or sulphamic acid solutions at 70 °C. The sole compounds able to stop the IG attack were those with a S atom with electronic lone pair free. These inhibitors perforrmed their action by reducing the differences in the corrosion rates between the chromium depleted grain-boundaries and the matrix. The influence exerted by HS- ion on the corrosion process was evaluated, since some of the efficient inhibitors could decompose with the formation of HS- ions (or H2S).

The inhibition of the intergranular corrosion of a sensitized stainless steel in hot acidic solutions.

TRABANELLI, Giordano;FRIGNANI, Alessandro;ZUCCHI, Fabrizio;ZUCCHINI, Massimo
1983

Abstract

Some different types of organic substances (an acetylenic derivative, S- or N-containing compounds) were tested as inhibitors for the intergranular (IG) corrosion of a sensitized AISI 304 stainless steel, in diluted sulphuric or sulphamic acid solutions at 70 °C. The sole compounds able to stop the IG attack were those with a S atom with electronic lone pair free. These inhibitors perforrmed their action by reducing the differences in the corrosion rates between the chromium depleted grain-boundaries and the matrix. The influence exerted by HS- ion on the corrosion process was evaluated, since some of the efficient inhibitors could decompose with the formation of HS- ions (or H2S).
Trabanelli, Giordano; Frignani, Alessandro; Zucchi, Fabrizio; Zucchini, Massimo
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/461465
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 3
social impact