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Title

Effect of mineral compounds in phosphoric acid polluted by sulphide ions on corrosion of nickel

AuthorsGuenbour, A.; Zeggaf, S.; Ben Bachir, A.; Escudero Rincón, María Lorenza; López, María Francisca
KeywordsBentonite
Capacitance
Electrochemical impedance spectroscopy
Films
Inhibitors
Mineral compounds
Nickel
Phosphate
Phosphoric acid
Sulfide ions
x-ray photoemission spectroscopy
Issue DateJun-1999
PublisherNACE International
CitationCorrosion 55(6): 576-581 (1999)
AbstractThe inhibiting effects of two mineral compounds on corrosion of nickel in phosphoric acid (H3PO4) polluted by sulfide ions (S2−) was studied using electrochemical and spectroscopic techniques. Electrochemical measurements showed addition of bentonite or phosphate mineral reduced the corrosiveness of H3PO4 polluted with S2− considerably. X-ray photoemission spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS) showed these inhibitors did not incorporate into the passive film of the material and, therefore, did not induce any change in capacitance of the passive film. Results suggested the inhibiting effect stemmed from avoiding the adsorption of S2− ions on the nickel surface.
Publisher version (URL)http://doi.org/10.5006/1.3280498
URIhttp://hdl.handle.net/10261/82897
DOI10.5006/1.3280498
Identifiersissn: 0010-9312
Appears in Collections:(CENIM) Artículos
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