Selection Of Corrosion Resistant Materials - Honeywell MagneW 3000 Plus Application Manual

Selection of Corrosion-
Resistant Materials
The corrosiveness of fluids used under
practical conditions may vary according
to the type and amount of impurities
present, the operating temperatures,
the variances in flow rate, and the
concentration of fluids.
Table 4—Characteristics of Wet Contact Materials
Material Main Component
Polyurethane rubber Polyurethane
Teflon PFA Tetrafluoroethyl
ene resin
Ceramic Alumina ceramic
Al O
2
Chloroprene rubber Chloroprene
SUS316L Cr : 17%
Ni
Mo : 2.25%
C
Fe : Remainder
Titanium Ti
Hastelloy C-276 Mo : 16%
Cr : 16%
Fe : 5%
W
Ni
12
Selection of Lining Materials
The lining materials for use in the
MagneW 3000 PLUS include Teflon
PFA, alumina ceramic, polyurethane
rubber, and chloroprene rubber. Their
general characteristics are shown in
Table 4.
Selection of Materials for Electrodes
and Wet Contact Rings
The general characteristics of electrode
materials is shown in Table 4.
Characteristics
Lining Materials
A synthetic elastic rubber. Excellent
abrasion resistance. Little chemical
resistance.
A synthetic polymer containing fluorine
(F) in the molecule. Resistant to almost
all chemicals except for high-
temperature fluorine, molten alkalis,
and some halogen compounds.
Excellent heat resistance together with
a low friction characteristic and non-
adhesiveness.
Excellent friction resistance. Suited for
: 99.7% high temperatures and high pressures.
3
Chemical resistance is slightly lower
than that of Teflon PFA. Weak to alkali
fluids.
The friction and chemical resistances
are almost comparable to those of
polyurethane rubber.
Electrode Materials
Resistant to corrosion in a weak alkali
: 13% or acidic atmosphere.
Unusable in inorganic and organic
: <0.03%
acids, chlorides, etc.
: >99.3% Resistant to corrosion in an oxidizing
atmosphere.
In particular, usable in the presence of
chlorine ions. Unusable in sulfuric acid,
nitric acid, etc.
(The empty-detection function of the
converter cannot be used.)
A wide range of uses since it is usable
in moderately oxidizing and reducing
atmospheres.
: 4%
Weak to sulfides, sulfuric acid, etc.
: Remainder
MagneW 3000 PLUS Specification and Application Guide
Selection of Ground Ring Material
The same material for ground rings as
for electrodes should be selected since
both come in contact with fluids.
Recommended Environment
Temperature: –40 to +50°C (–40 to
+122°F)
Pressure: 426 psi maximum
NOTE: Provides heat resistance in hot
atmospheres.
Temperature:
–40 to +100°C (–40 to +212°F) for
diameters 2.5 to 10 mm (0.1 to 0.4 in.)
–40 to +160°C (–40 to +320°F) for
diameters 15 to 200 mm (0.6 to 7.9 in.)
–40 to +100°C (–40 to +212°F) for
diameters 2.5 to 10 mm (0.1 to 0.4 in.)
Pressure: Refer to Table 5, page 15.
Temperature: –40 to +180°C
(–40 to +356°F)
2
Pressure: 1 to 40 kg/cm
14 psi maximum
Temperature: –10 to +70°C (14 to 158°F)
Pressure: 142 psi maximum
Water (tap and sewage) and weak alkalis
(such as caustic soda of 50% or less)
A variety of chloride solutions
(ammonium chloride, potassium
chloride, ferrous chloride, etc.), sea
water, etc.
A variety of organic and inorganic acids,
alkalis, etc.
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