[phys4phys] семинар Алексеј Рогов

[Rastko Vasilic]

Поштоване колегинице и колеге,

Са задовољством Вас позивам на семинар који ће 28. фебруара одржати др
Алексеј Рогов са Универзитета у Манчестеру. Семинар ће се одржати у
Плавој сали (3. спрат, соба 665) Физичког факултета са почетком у
12:15.

Title: The role of cathodic current in plasma electrolytic formation
of anodic coatings

Abstract: Although conventional anodising of aluminium under AC
polarisation has not demonstrated any benefits in respect to DC
processes, a significant effect of cathodic current was discovered in
high-voltage anodic processes, which are usually accompanied by
dielectric breakdown of the formed films. Such processes are known as
Microarc or Plasma electrolytic oxidations (MAO/PEO). In special
cases, local breakdowns (micro-discharges) may promote some
interesting coating morphology, however, avoiding the stochastic
micro-discharging may be beneficial for more predictable process
control, its efficiency, uniformity of the coating on electrodes of
complex shape, as well as for design of the affordable equipment. A
bipolar PEO, when anodic process alternated by cathodic pulses, may be
softened by extinguishing of the micro-discharges though maintaining
the coating growth rate and formation of the high-temperature phases.
However, control of the bipolar PEO processes is a challenge due to a
lack of its mechanistic understanding and difficulties in optimization
due to many controlling parameters. This talk summarises recent
studies on in-situ diagnostics of plasma electrolytic oxidation and
the role of cathodic current in the rational design of anodic coatings
on valve metals.


Срдачан поздрав,
Растко Василић
--
Dr Rastko Vasilic, professor
Faculty of Physics, University of Belgrade
Studentski trg 12-16, 11000 Belgrade
Serbia