Anodizing
:
Anodizing
is an electrolytic passivation process used to increase the thickness of
the natural oxide layer on the surface of metal parts.
The process is called "anodizing" because the
part to be treated forms the anode electrode of an electrical
circuit. Anodizing increases corrosion resistance and wear resistance, and
provides better adhesion for paint primers and glues than does bare metal.
Anodic films can also be used for a number of cosmetic effects, either with
thick porous coatings that can absorb dyes or with thin transparent coatings
that add interference effects to reflected light.
Anodizing
is also used to prevent galling of threaded components and to make
dielectric films for electrolytic capacitors. Anodic films are most
commonly applied to protect aluminum alloys, although processes also exist
for titanium, zinc, magnesium, niobium, zirconium,
hafnium, and tantalum. Iron or carbon steel metal exfoliates
when oxidized under neutral or alkaline microelectrolytic conditions; i.e., theiron
oxide (actually "ferric hydroxide" or hydrated iron oxide,
also known as rust) forms by anoxic anodic pits and large cathodic
surface, these pits concentrate anions such as sulfate and chloride accelerating
the underlying metal to corrosion. Carbon flakes or nodules in iron or steel
with high carbon content (high carbon steel, cast iron) may cause an
electrolytic potential and interfere with coating or plating. Ferrous
metals are commonly anodized electrolytically in nitric acid, or by
treatment with red fuming nitric acid, to form hard black ferric
oxide. This oxide remains conformal even when plated on wire and the wire is
bent.
Anodization changes the microscopic texture of the
surface and changes the crystal structure of the metal near the
surface. Thick coatings are normally porous, so a sealing process is often
needed to achieve corrosion resistance. Anodized aluminium surfaces, for
example, are harder than aluminium but have low to moderate wear resistance
that can be improved with increasing thickness or by applying suitable sealing
substances. Anodic films are generally much stronger and more adherent than
most types of paint and metal plating, but also more brittle. This makes them
less likely to crack and peel from aging and wear, but more susceptible to
cracking from thermal stress.
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