Photoemission study of the adsorption of benzotriazole on copper

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5585085

Fang, B S

A photoemission study was performed on the chemisorption of benzotriazole (BTA) on polycrystalline copper (clean and oxidized) surfaces to understand the corrosion inhibition mechanism. The energy distribution curves indicate benzotriazole bonding to copper through nitrogen lone pair orbitals. They also disagree with the models which suggest that the benzotriazole molecular plane is oriented parallel to the copper surface by showing a lack of ..pi..-d interaction. The observed chemisorption of benzotriazole on atomically clean copper surfaces at room temperature suggests that an oxide layer is not necessary for the adsorption of benzotriazole. No structural difference was observed in the photoemission studies on BTA-clean copper and BTA-cuprous oxide surface film. This result demonstrates the major role of the copper atom upon benzotriazole adsorption. A new model of the CuBTA chemisorbed structure is presented. The Cu-BTA polymer is formed by strong charge-transfer interactions between benzotriazole molecules instead of by BTA-Cu-BTA connections. It successfully interprets the experimental results from solubility and tarnish resistance tests on adsorbed films on copper surfaces. It also gives a reasonable explanation for the different inhibition coefficients among BTA-treated copper single crystal surfaces. Mechanisms are suggested for the benzotriazole inhibition mechanisms.

• Research Organization: Iowa State Univ. of Science and Technology, Ames (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5585085
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
400500* -- Photochemistry
AZOLES
BENZOTHIAZOLES
CHEMICAL REACTIONS
CHEMISORPTION
COPPER
CRYSTALS
ELEMENTS
EMISSION
HETEROCYCLIC COMPOUNDS
METALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHOTOEMISSION
POLYCRYSTALS
SECONDARY EMISSION
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
THIAZOLES
TRANSITION ELEMENTS