STUDY ON INHIBITION BY PIPERIDINE USING ATOMIC ABSORPTION SPECTROMETRY I. CORROSION BEHAVIOR OF TYPE 304 STAINLESS STEEL IN HYDROCHLORIC ACID AND ITS INHIBITION BY PIPERIDINE

J Chin Soc Corr Pro

1998, Vol. 18

Issue (3): 161-167 DOI:

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STUDY ON INHIBITION BY PIPERIDINE USING ATOMIC ABSORPTION SPECTROMETRY I. CORROSION BEHAVIOR OF TYPE 304 STAINLESS STEEL IN HYDROCHLORIC ACID AND ITS INHIBITION BY PIPERIDINE

TANG Zi-long SONG Shi-zhe (Department of Materials; Tianjin University; Tianjin 300072)GUO Ying-kai (Tianjin Professional College; Tianjin 300402)

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Abstract The corrosion behavior of type 304 stainless steel and industrially pure iron, chromium, nickel in 1.0mol/L HC1 and their corrosion inhibition by piperidine (PD) were investigated by atomic absorption spectrometry (AAS), current vs time relation at constant potential and polarization curve measurements. The results showed that the dissolution of 304 stainless steel in HC1 could be inhibited effectively by PD. The passive range of Cr in HC1 would extend in the presence of PD. For Fe, PD acted as a cathodically controlled inhibitor. A new idea "selective inhibition" was suggested and applied to describe the inhibition by PD for 304 stainless steel in HC1. In the presence of PD , the dissolution rates of Cr and Ni in 304 matrix decreased obviously, and the molar percentages by which various components in 304 stainless steel dissolved were different from those in the absence of PD. AAS data indicated that regardless of the presence of PD the dissolution of Fe, Ni and Mn took the form of divalence, while Cr dissolved in the form of trivalence.

Key words: Stainless steel Hydrochloric acid Piperidine Inhibition mechanism

Received: 25 June 1998

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TANG Zi-long SONG Shi-zhe (Department of Materials; Tianjin University; Tianjin 300072)GUO Ying-kai (Tianjin Professional College; Tianjin 300402). STUDY ON INHIBITION BY PIPERIDINE USING ATOMIC ABSORPTION SPECTROMETRY I. CORROSION BEHAVIOR OF TYPE 304 STAINLESS STEEL IN HYDROCHLORIC ACID AND ITS INHIBITION BY PIPERIDINE. J Chin Soc Corr Pro, 1998, 18(3): 161-167.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I3/161

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