In situ laser raman spectroelectrochemical study of the corrosion of lead in dilute Na/sub 2/SO/sub 4/ solution at high temperature

Journal Article · Tue Mar 01 04:00:00 EST 1988 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2095657· OSTI ID:7008675

McMahon, J J; Ruther, W; Melendres, C A

The high temperature corrosion and passivation behavior of a lead electrode in a 100 ppm Na/sub 2/SO/sub 4/ solution was examined by in situ laser Raman spectroscopy and cyclic voltammetry. The experimental observations were compared with the thermodynamic predictions of the temperature-dependent Pourbaix diagram for lead in aqueous sulfate solution. At open-circuit condition and room temperature, the composition of the corrosion film was found to be 3PbOPbSO/sub 4/H/sub 2/0. The latter composition is stabilized relative to PbSO/sub 4/ by an elevated local pH at the electrode surface which accompanies the reduction of dissolved oxygen at open circuit. At higher temperatures only PbOPbSP/sub 4/ and PbSO/sub 4/ were observed at open circuit. By correlating the temperature dependence of the cyclic voltammetry with the Pourbaix diagram the PbSO/sub 4/ corrosion film was found to be a more effective passivator than the PbOPbSO/sub 4/ film.

• Research Organization: Dept. of Chemistry, Fordham Univ., Bronx, NY (US)
• OSTI ID: 7008675
• Journal Information: J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 135:3; ISSN JESOA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CORROSION
CORROSIVE EFFECTS
DISPERSIONS
ELECTROCHEMICAL CORROSION
ELECTRODES
ELEMENTS
EMISSION SPECTROSCOPY
KINETICS
LASER SPECTROSCOPY
LEAD
LEAD COMPOUNDS
LEAD OXIDES
LEAD SULFATES
METALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
RAMAN SPECTROSCOPY
REACTION KINETICS
SODIUM COMPOUNDS
SODIUM SULFATES
SOLUTIONS
SPECTROSCOPY
SULFATES
SULFUR COMPOUNDS
THERMODYNAMICS