Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/91740
Title: Synergistic Effects between Sodium Tripolyphosphate and Zinc Sulfate in Corrosion Inhibition for Copper in Neutral Tap Water
Authors: Feng, Y.
Siow, K.-S. 
Teo, W.-K. 
Tan, K.-L. 
Hsieh, A.-K. 
Keywords: Cooling water
Copper
Inhibitors
Scanning electron microscopy
Sodium tripolyphosphate
Synergistic effects
Tap water
X-ray photoelectron spectroscopy
Zinc sulfate
Issue Date: Jul-1997
Source: Feng, Y.,Siow, K.-S.,Teo, W.-K.,Tan, K.-L.,Hsieh, A.-K. (1997-07). Synergistic Effects between Sodium Tripolyphosphate and Zinc Sulfate in Corrosion Inhibition for Copper in Neutral Tap Water. Corrosion (Houston) 53 (7) : 546-555. ScholarBank@NUS Repository.
Abstract: The corrosion inhibition behavior of sodium tripolyphosphate (Na5P3O10, or TPP) and zinc sulfate (ZnSO4) and the synergistic effects between them were studied for copper in neutral simulated tap water using electrochemical methods, x-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Zn2+ alone showed few inhibiting effects on copper corrosion. The film formed in the presence of Zn2+ was porous and composed mainly of cuprous oxide (Cu2O), which was similar in morphology and composition to films formed in the absence of the inhibitor. In the presence of TPP, a smooth and compact film, believed to be of Cu(II)-TPP compounds, formed on the copper surface. More protective films were formed in solutions containing TPP and Zn2+ as a blend. High zinc content (15% to 19%) was detected by XPS. Synergistic effects of TPP and Zn2+ were believed to result from formation of Zn(II)-TPP compounds that incorporated in the films, with Cu(II)-TPP in the upper layer and Cu2O in the inner layer. The zinc compounds increased the anodic diffusion resistance of copper ions in the film and enhanced polarization of the cathodic reduction of dissolved oxygen.
Source Title: Corrosion (Houston)
URI: http://scholarbank.nus.edu.sg/handle/10635/91740
ISSN: 00109312
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

56
checked on Apr 20, 2018

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.