ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Langmuir-Blodgett films (LB) of hydroxamic amphiphiles were used as coating barriers on metalsurface against corrosion. Two long-chain hydroxamic acids [CH3(CH2)16CONHOH] monolayers inthe presence of some divalent cations (Ca2+, Mg2+, and Cu2+) have been studied at different pH ofthe subphase. The monolayer was characterized by surface pressure-area isotherms and visualizedby Brewster angle microscope (BAM).Compact Langmuir layers were deposited on copper surface, where the modified surfaces werecharacterized by contact angle measurement as well as by electrochemical techniques. Themorphology of LB coated copper surface was visualized by atomic force microscopy (AFM). Thecoated copper surfaces were tested in corrosive media at acidic and neutral pH. The results showthat the multi-molecular LB films of hydroxamic acid salts form good barriers against coppercorrosion. The comparison of these results with copper coated by LB layers without divalent cationsshows that the presence of divalent cations in the subphase increases the copper corrosioninhibition. The octadecanoyl hydroxamic acid (C18N) results in better and more stable monolayerwith cations in the subphase
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.537-538.9.pdf
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