How does chloride deteriorate passive films? What modern techniques help describe the mechanisms of chloride attack?
You can look the works from I. Diez-Perez about studies on iron passive films.
http://jes.ecsdl.org/content/148/8/B307.abstract
and references therein
dear all
please see more work for 4 decads on passivity - please see my reviews appeared in CORROSION REVIEWS - my model of breakdown of passivity - figures
since 1990
dear all
model of passivity ( which i and D.D.Macdonald follow are poor xerox of the model of T.P.Hoar); If you access see the book by J.M.west on "corrosion processes and electro deposition"
no doubt you see the book by H.H.Uhlig ( see my book on modern advances in corrosion and its control with prof S.N.Banejee)
As for technique to see breakdown of passivity SEM is enough - I explain in simpler terms -Chlorides adsorb on the M-O weak sites, form chloro hydroxy metal soluble complexes - Insoluble complexes follow time dependent passivity - pit weak nucleate and grow at weaker sites - you can follow pit propagation currents using AVRAMI'S equations -See TWO and three dimensional growth equations used in Electrocystallisation
if you can access see my papers with M.Jayalakshmi in various journals
SEM-EDX, powder XRD and XPS techniques are good techniques to anlyze your problem....
dear Chaitanya Kumar Kanukula , he wants the mechanism - not techniques- techniques suggested by you are useless in the absence of good theory
Please
see old literature - dated back 1960's passivity breakdown is known
Respected Muralidharan sir,
As you know SEM-EDX, powder XRD, and more specifically XPS techniques are helpful for analysis of different corrosion products formed on metal surface. XPS will be very helpful to determine the valencies of metal and other elements. By knowing corrosion products formed and oxidation states of the elements by using this techniques only we can predict the mechanism. By considering our personal examination and results only we have to demonstrate the mechanism, instead of simply looking at literature. Ofcorse Literature reports are also helpful to support our results. But what we consider is our experimental approach and results.
sorry dear
have proposed something earth shaking? is it different from others?
please publish in Nature if so
We are yet to do something different from what is known earlier-we agree with them --only we do not differ - characterization techniques are like witnesses - some may be for or against - they are not actual players--
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