The Effect of Temperature on the Breakdown and Repassivation Potentials of Welded Alloy 22 In 5 M CACI2 Page: 4 of 33
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quantify the effects of each of the secondary phase precipitates and carbides on corrosion
resistance were carried out, and as such, any analyses in that regard is beyond the scope of this
manuscript and are not addressed herein.
These manuscript reports in detail the observations of experiments performed in 5 M CaCl2 as a
function of temperature. It should be noted that these experiments compare the corrosion
susceptibilities of the base and weld metal as they would be present under service conditions. It
is by no means an exercise in predicting long term behavior of weld and base metal under long
term applications and should never be used as such.
5 M CaC2 was selected because of its very high Cl~ concentration, for use to probe the depths of
susceptibility of Alloy 22 to localized corrosion in a series of fast experiments. The MCA
configuration used in this work is optimized for the study of crevice corrosion as it provides 24
potential crevice generation sites on a surface area of less than 10 cm2. The temperature range of
study was between 45 and 120 "C ( 2 "C).
The material used in this study is Alloy 22 (N06022). The chemical compositions of the plates
as well as that of the filler metal (wire) used in the welding process appear in Table 1 as
documented by the supplier. The composition of the filler metal was analyzed for before it was
used in the welding process (Table 1). The compositions of the plates and filler metal are
consistent with ASTM-B 574 and ASTM-B 575 standards for rods (wires) and plates/sheets
respectively [28, 29]. The weld metal also meets the standard of ASME SFA5.14 for
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IIevbare, G.O. The Effect of Temperature on the Breakdown and Repassivation Potentials of Welded Alloy 22 In 5 M CACI2, report, July 5, 2006; Las Vegas, Nevada. (https://digital.library.unt.edu/ark:/67531/metadc879332/m1/4/: accessed June 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.