Effect of Divalent Cations in Langmuir-Blodgett Films on the Protection of Copper
against Corrosion
|
| Journal |
Materials Science Forum (Volumes 537 - 538) |
| Volume |
Materials Science, Testing and Informatics III |
| Edited by |
J. Gyulai and P.J. Szabó |
| Pages |
9-16 |
| DOI |
10.4028/www.scientific.net/MSF.537-538.9 |
| Online since |
February, 2007 |
| Authors |
F. Al-Taher,
J. Telegdi,
Erika Kálmán
|
| Keywords |
Atomic Force Microscopy (AFM), Divalent Cations, Hydroxamic Acid, Langmuir Blodgett Films, Nanocoating |
| Abstract |
Langmuir-Blodgett films (LB) of hydroxamic amphiphiles were used as coating barriers on metal
surface against corrosion. Two long-chain hydroxamic acids [CH3(CH2)16CONHOH] monolayers in
the presence of some divalent cations (Ca2+, Mg2+, and Cu2+) have been studied at different pH of
the subphase. The monolayer was characterized by surface pressure-area isotherms and visualized
by Brewster angle microscope (BAM).
Compact Langmuir layers were deposited on copper surface, where the modified surfaces were
characterized by contact angle measurement as well as by electrochemical techniques. The
morphology of LB coated copper surface was visualized by atomic force microscopy (AFM). The
coated copper surfaces were tested in corrosive media at acidic and neutral pH. The results show
that the multi-molecular LB films of hydroxamic acid salts form good barriers against copper
corrosion. The comparison of these results with copper coated by LB layers without divalent cations
shows that the presence of divalent cations in the subphase increases the copper corrosion
inhibition. The octadecanoyl hydroxamic acid (C18N) results in better and more stable monolayer
with cations in the subphase. |
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