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Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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surface that received Treatment A. The only exception is Inhibitor II in specimen B2-3. One possible explanation for the absence of Inhibitor II in this analysis of B2-3 could be that the ion beam hit at not the cement paste but at the interior of an aggregate, since inhibitors mostly migrate within the cementitious material, but not aggregates. Inhibitors I and II were detected in all the treated concrete samples—two cores from the treated beams and one core from the treated underside of the plaza floor. Inhib- itor III was detected less consistently at var- ious depths. It was shown in all the surface specimens, and at 1.8 in depth in specimen B2-4 and at 3 in depth in U-6, but was absent in other specimens. Penetration depth data of Inhibitor I and Inhibitor II in concrete indicate that these inhibitors are present at the depth of embedded rebar ; they are available to be adsorbed onto the rebar surface to form a protective layer. This data corresponds to the XPS analysis of embedded rebar in topi- cally treated concrete.5 Representative mass spectra of Treat- ment B, of four concrete chips at different depths from core B1 (taken from the treated beam), and of a concrete chip taken from FIGURE 1. Mass spectra of Treatment A coated concrete at various depths casings. TABLE 3. INHIBITOR DETECTION AT VARIOUS DEPTHS (TREATMENT B) Specimens Inhibitor I Inhibitor II Inhibitor III B1-1 Yes Yes Yes B1-2 Yes Yes Yes B1-3 Yes Yes No B1-4 Yes Yes No B2-1 Yes Yes Yes B2-2 Yes Yes No B2-3 Yes No No B2-4 Yes Yes Yes U-1 Yes Yes Yes U-2 Yes Yes No U-3 Yes Yes No U-4 Yes Yes No U-5 Yes Yes No U-6 Yes Yes Yes Control No No No weeks after the topical treatment. This peak was not detected in untreated concrete (control) (Figure 1). Treatment B Treatment B contained a number of inhibitors. Inhibitor I manifested as a peak at m/z 62, Inhibitor II at 100.1, and Inhib- itor III at 90.1. Table 3 shows a summary of inhibitor detection at various concrete chips. DART-MS data in Table 3 shows that Inhibitor I and Inhibitor II were detected at all depths, as deep down as 3 in below the MIGRATING CORROSION INHIBITORS 10 JUNE 2016 MATERIALS PERFORMANCE CORTEC SUPPLEMENT TO MP

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