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Hard anodizing is an electrolytic process that produces a thick anodic coating up to a minimum thickness of 50 microns and is performed after all components are completely machined. The result produces all exposed surfaces to have the aluminum surface component converted to an aluminum oxide base. This oxide is integral with the base metal, and will not chip or degradate even if the part is dented. Aluminum oxide is very hard and resists scratching. The rated hardness is 45 to 65 Rockwell C and demonstrates excellent salt fog resistance and chemical stability over a pH range of 4.5 to 8.5. However, strong acids and alkalis should be avoided.
Epoxy coating is
a deposit of epoxy powders on clean and sandblasted
surface base that provides extremely effective
protection against highly corrosive environments.
All epoxy coated parts are cured for a minimum
of 20 minutes at 210°C (346°F), with a
typical finish coating of 80 to
100 microns. All Max-Air epoxy coated parts have
undergone 1000 hours of salt fog testing with no
observable corrosion. Epoxy coating is recommended
where the application environment is strongly
aggressive. With the exception of particular solvents,
epoxy coating resists acids and alkali and also
is formulated to have excellent UV resistance.
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ENP is a hard, dense alloy
of nickel and phosphorus that is chemically impregnated in
the base metal. Nickel deposits are produced
by the chemical reduction of nickel without using electricity. The
coating is amorphous and uniform in thickness. Threads,
holes, exterior corners, flat surfaces, and all recesses
are uniformly impregnated. The coating is typically
20 to 30 microns; ENP has an excellent salt fog
resistance and is more resistant to alkaline exposure
than acid exposure. ENC is hard, lustrous and resistant
to incidental damage and is clearly an economic
alternative to stainless steel.
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