Galvanic Corrosion Prevention Coatings
Galvanic
corrosion resistant coatings are applied to protect materials such iron and
steel alloys against corrosion.
The coatings
act as sacrificial coatings and they will corrode preferentially slowly while
minimizing the corrosion occurring to the steel due the electrode potential
difference between these metals.
For
example, Thermal Spray Zinc (called TSZ) will protect carbon steel .
Dissimilar
metals and alloys have different electrode potentials and when into
contact in an electrolyte a galvanic solution (sea water), one metal acting as
anode and the other as cathode.
The
potential difference between the dissimilar metals or alloys is the driving
force to accelerate the corrosion attack on the anode member of the galvanic
couple.
Thermal spray coating process, has been used
on many components to work in sea water (SEAWATER is generally considered to be
a corrosive environment) including a wide range of structures, such, bridges, steel tower wind power generation,
offshore platform production units and many others.
The
technology has been proven to be far more effective corrosion protection than
paint systems for providing longer term protection.
