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Sulphuric acid Anodizing
This form of anodizing yields coatings under 1 mil thick.
Although it offers mild abrasion resistance it is more durable
than chromic anodize. Like most anodizes corrosion resistance is
excellent. The most desirable feature of this form of anodizing
would be the excellent results from dyeing yielding deep and
rich colors.
Sulfuric anodizeis formed by using an
electrolytic solution of sulfuric acid at room temperature and a
current density of 15 to 22 Amps per square foot. The process
will run for 30 to 60 minutes depending on the alloy used. This
will produce a generally clear coating, depending on sealing, a
minimum of 8µm thick.
Properties:
Sulfuric anodizing provides for several
desirable qualities such as:
- Corrosion Resistance (336+ hours
salt spray resistance )
- Moderate Durability
- Excellent Dyability (yielding deep,
rich colors)
Sulfuric anodize coatings are often
sealed to enhance corrosion resistance. Hot water seals produce
the clearest sulfuric anodize while sodium dichromate yields a
yellow-green appearance but is generally a better seal.
Materials:
Sulfuric anodizing is rather tolerant
of aluminum alloys for anodizing with the exception of
high-silicon die-cast alloys such as 380. The less alloying
elements there are the higher the clarity and depth of color of
the anodize coating.
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start an anodizing unit
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