Two types of corrosion testing have been used
to verify the corrosion protection provided by this
protector system:
Salt Spray Test (ASTM B117)
The test fixture was composed of a properly
torqued nut and bolt on a flange with the protector
installed. It was subject to a 5% salt solution in a
salt fog cabinet according to ASTM B117 procedures.
After 90 days, the carbon steel nut and bolt were
both free of corrosion
Sour Gas Test (NACE TM 0177-96)
This test showed what protection was given by
this protector on a B7 stud in H2S
corrosion environment. The environment for the
exposure was a moist (100% relative humidity), in an
atmosphere containing H2S.
After 90 days, the carbon steel nut and bolt were
both free of corrosion.
Figure 2. The appearance of fasteners after a
90-day exposure in the ASTM B-117 salt spray test.
The fastener protected with the NUT-SEAL system is
the only one free of corrosion.
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