Photoelectrochemical study of pitting on iron in borate buffer solution containing inhibitor

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Corrosion

DOI:https://doi.org/10.5006/1.3280428· OSTI ID:427756

Yang, M; Chen, L; Cai, S ^[1]

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1. Peking Univ., Beijing (China). Dept. of Chemistry

The photoelectrochemical behavior and the susceptibility of iron to pitting in borate buffer containing chloride ions (Cl{sup {minus}}) were investigated in the presence and absence of inhibitor PC-604, which is a mixture of polyhydric alcohol phosphoric easter and polyphosphoric ester of various molecular weights. Measurements of the band gap (E{sub g}) of the passive film on iron showed inhibitor concentration and passivation time did not interfere with E{sub g}. Photocurrent and photocurrent transients increased with increasing inhibitor quantities and passivation times at constant potential. The decay time-constant of the photocurrent transient was investigated as a specific parameter of the film. Data showed this parameter was related to pitting susceptibility of the passive film on iron.

• Sponsoring Organization: USDOE
• OSTI ID: 427756
• Journal Information: Corrosion, Journal Name: Corrosion Journal Issue: 1 Vol. 53; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORATES
BORIC ACID
CHLORIDES
CORROSION INHIBITORS
ELECTRIC CURRENTS
EXPERIMENTAL DATA
IRON
OXIDES
PASSIVATION
PH VALUE
PHOTOCHEMICAL REACTIONS
PITTING CORROSION
PLATINUM
SEMICONDUCTOR MATERIALS
SODIUM COMPOUNDS
SODIUM SULFATES