Anodize CleAning TesTs
Chart 2 – Inorganic Adsorption
ID
Chemistry
Conc.
pH
Temp.
Immersion Time
Color
G
Sanodal Gold 4N
20 g/L
5
140°F
10 min.
Gold
H
Step 1: K2Fe(CN)6 · 3H2O
10 g/L
70°F
2 min.
Step 2: FeNO3
10 g/L
70°F
2 min.
Blue
PRODUCTS FINISHING
— pfonline.com
Chart 3 - Inorganic Electro-Deposition
ID
I
J
K
Chemistry
30 g/L CuSO4 · 5H2O
10 g/L MgSO4 · 7H2O
6 g/L H2SO4
20 g/L Anodal Color TS-2
20 g/L H2SO4
20 g/L Anodal Color TS-2
20 g/L H2SO4
Voltage
Time
Color
18V AC
5 min.
Maroon
18V AC
3 min.
Bronze
18V AC
12 min.
Black
the world to produce bronze and black finishes for
exterior architectural components. Although limited in
color range, some variation can be achieved by varying
the coloring time and the metal deposited. In the case of
this experiment, tin was used to create a bronze and black
finish; copper was used to produce maroon.
Sealing Technologies
It is well known that without a quality seal, one cannot
expect a durable, fade-resistant finish. Technologies used
for sealing are highly varied. There are boiling seals, midtemperature seals and room temperature seals, usually
referred to as cold seals. Sequential processes, which
include duplex and high-barrier seals, have been used for
special applications that require enhanced corrosion or
alkali resistance.
Boiling seals can be nickel acetate-based or just purified
water. Hydration or swelling of the oxide is the primary
seal mechanism but if nickel is present, hydration is
accompanied by nickel precipitation to further improve
the seal quality, and in many cases, the fade resistance
of the colorant. Mid-temperature seals work on the same
principle, but these products contain surfactants that act
as a catalyst, allowing them to run at temperatures of as
much as 40°F below the boiling point.
Cold seal chemistries are based on nickel fluoride.
The seal mechanism includes the precipitation of nickel
compounds with the simultaneous reaction of fluoride
with available aluminum. The seal is usually completed
by dipping the part in hot water for a few minutes in order
Sterrad is a system that uses low-temperature
hydrogen peroxide gas plasma technology to sterilize
instruments and medical devices.
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