Test Report
Study of 6NHCl CorrosiononCommercial 316SS, HastelloyC-22
andTrueTube
™
Variants
April 2004
TestingConducted by:
Bellefonte PA16823
St. LouisMO 63114
©2004O’BrienCorporation •QLT-TRTTCORR • 11AUG04
TestReport
Testingwas conducted todetermine the relative corrosion resistance ofHastelloyC-22, commercial 316LSS,
commercial tubewith fused silica coating, electropolishedTrueTubeEP, and electropolishedTrueTubeEPSwith a
deactivated
layer of bonded amorphous silicon applied viaCVD technology (Siltek™) provided byRestek
Corporation.
CorrosionTest Protocol andResults
The test specimenswere½”OD tubingwith 0.049”wall thickness. Theywere cut, faced and deburred to
approximately8” in length. Each samplewas rinsed inDIwater and blown dryusing 0.003
µ
m filteredN
2
gas.
The sampleswhereweighed and one endwas capped usingLDPETubeCaps. The sampleswhere then placed in a
tube holder and filledwith 6NHCl. The other end of the tubewas then capped using a tube cap that had a pinhole
in it to let the sample breath. The sampleswhere exposed to theHCl for 72 hours. During the exposure the samples
where agitated using vibration every8 hours. After the 72-hour period the sampleswhere drained rinsed and dried.
The final weightswhere then recorded. The tubing that was tested is listed as follows:
HastelloyC-22
Commercial Grade 316LTubing
Commercial Grade 316LTubingwith Fused SilicaCoating
ElectropolishedTrueTubeEPTubing
ElectropolishedTrueTubeEPTubingwith a SiltekCoating
Table 1CorrosionRates forTubingTested
Material
Weight Loss
(g)
CorrosionRate
(g/hr cm^2)
MPY
(mils per year)
Sample
Variance
HastelloyC-22
0.0075
1.69E-06
0.6733
0.001622
Commercial Grade 316LWeldedTubing
0.3085
6.93E-05
29.9400
0.640267
Commercial Grade 316LTubingwithFusedSilicaCoating
0.0492
1.1E-05
4.7567
13.19002
ElectropolishedTrueTubeEPTubing
0.1669
3.6E-05
16.5733
0.795022
TrueTube EPwithSiltekCoating (TrueTube EPS)
0.0031
6.65E-07
0.2867
0.000622
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lit. cat.#RPC-cor2
