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Title: Role of Zn2+ in the inhibition of corrosion of mild steel by 1-hydroxyethane-1, 1-diphosphonic acid
Authors: Rajendran, Susai
Joany, R Maria
Apparao, B V
Palaniswamy, N
Issue Date: May-2002
Publisher: NISCAIR-CSIR, India
Abstract: 50 ppm sodium salt of 1-hydroxyethane-1,1-diphosphonic acid (HEDP) offered only 11% inhibition efficiency (IE) to corrosion of mild steel immersed in neutral aqueous environment containing 60 ppm chloride. When 50 ppm Zn2+ is added to 50 ppm HEDP, the IE increased to 98%. The influence of Zn2+  on the corrosion -inhibition by HEDP is discussed based on the results obtained from UV-visible, FTIR and luminescence spectra. Presence of Zn2+ facilitates. the transport of HEDP from the bulk of the solution to the metal surface; both the anodic reaction and cathodic reaction are controlled effectively.
Page(s): 197-200
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections: IJCT Vol.09(3) [May 2002]

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