Synergistic effects in the inhibition of copper corrosion

Journal Article · Tue Jun 01 00:00:00 EDT 1993 · Corrosion (Houston); (United States)

DOI:https://doi.org/10.5006/1.3316071· OSTI ID:6239612

Gonzalez, S; Laz, M M; Souto, R M ^[1]; Salvarezza, R C; Arvia, A J ^[2]

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1. Univ. de La Laguna, Tenerife, (Spain). Dept. de Quimica Fisica
2. Univ. Nacional de La Plata, (Argentina)

Benzotriazole (BTA), thiourea (TU), and potassium ethylxanthate (KEX), behave as copper (Cu) corrosion inhibitors under certain conditions. These chemicals have been investigated to establish whether they provided synergistic effects. The Cu corrosion inhibition was followed through changes in electrochemical characteristics. Cu specimens were tested at 25 C in two aggressive media, 0.1 M NaCl and 1 M NaClO[sub 4] using the linear potential sweep technique at 0.001 V/s and by scanning electron microscopy of Cu specimens subjected to potentiodynamic and potentiostatic routines. A comparative behavior of the different substances for Cu was presented in the 6.6 [le] pH [le] 11 range. For KEX-BTA mixtures, synergistic inhibition effects were found in 0.1 M NaCl (7 [le] pH [le] 11). The apparent synergistic inhibition was explained tentatively by an increase in the compactness of the polymer-like passivating layer of KEX-Cu, which formed in the presence of BTA and Cl[minus] ions.

• OSTI ID: 6239612
• Journal Information: Corrosion (Houston); (United States), Vol. 49:6; ISSN 0010-9312
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER
CORROSION PROTECTION
CORROSION INHIBITORS
SYNERGISM
AZOLES
CHLORATES
ELECTROCHEMICAL CELLS
EXPERIMENTAL DATA
MIXTURES
PASSIVATION
PERFORMANCE TESTING
PH VALUE
POTASSIUM COMPOUNDS
POTENTIOMETRY
SCANNING ELECTRON MICROSCOPY
SODIUM CHLORIDES
SODIUM COMPOUNDS
THIOUREA
XANTHATES
ALKALI METAL COMPOUNDS
ANTITHYROID DRUGS
CARBONIC ACID DERIVATIVES
CHLORIDES
CHLORINE COMPOUNDS
DATA
DISPERSIONS
DRUGS
ELECTRON MICROSCOPY
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
HORMONE ANTAGONISTS
INFORMATION
METALS
MICROSCOPY
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
TESTING
THIOUREAS
TITRATION
TRANSITION ELEMENTS
360105* - Metals & Alloys- Corrosion & Erosion