Materials Performance Supplements

CORTEC 2019

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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VAPOR PHASE CORROSION INHIBITORS TABLE 1 Inhibitor Combinations in the Study Additive ID Inhibitor Co 1(3%) + VCI Inhibitor (3%) Panel # Inhibitor Co 2(3%) + VCI Inhibitor (3%) Panel # Inhibitor Co 1 @ 5% Panel # Inhibitor Co 2 @ 5% Panel # VCI Inhibitor Panel # Inhibitor Co 1 A A+A2 1 A1+A2 1 A 1 A1 1 386 1 Inhibitor Co 1 B 2 2 2 2 2 Inhibitor Co 1 C 3 3 3 3 3 Inhibitor Co 1 D A+B2 1 A1+B2 1 B 1 B1 1 ECO386 1 2 2 2 2 2 Inhibitor Co 2 A1 3 3 3 3 3 Inhibitor Co 2 B1 A+C2 1 A1+C2 1 C 1 C1 1 Inhibitor Co 2 C1 2 2 2 2 Inhibitor Co 2 D1 3 3 3 3 A+D2 1 A1+D2 1 D 1 D1 1 Inhibitor Co 1 A2 2 2 2 2 Inhibitor Co 2 B2 3 3 3 3 Inhibitor Co 3 C2 B+A2 1 B1+A2 1 Inhibitor Co 4 D2 2 2 3 3 B+B2 1 B1+B2 1 DFT1.0-1.2 on all panels 2 2 3 3 B+C2 1 B1+C2 1 2 2 3 3 B+D2 1 B1+D2 1 2 2 3 3 C+A2 1 C1+A2 1 2 2 3 3 C+B2 1 C1+B2 1 2 2 3 3 C+C2 1 C1+C2 1 2 2 3 3 C+D2 1 C1+D2 1 2 2 3 3 D+A2 1 D1+A2 1 2 2 3 3 D+B2 1 D1+B2 1 2 2 3 3 D+C2 1 D1+C2 1 2 2 3 3 D+D2 1 D1+D2 1 2 2 3 3 ASTM B117 tests products in a 5% sodium chloride (NaCl) salt fog chamber with con- tinuous exposure as per the ASTM standard. Each coating was applied on cold-rolled steel (CRS) panels (SAE 1010), using a 0.40 drawdown bar. Dry film thicknesses (DFTs) yielded were 0.9 to 1.2 mils (23 to 30 µm). Each coating/inhibitor combination was applied in triplicate. Coated panels were air dried in lab conditions at an ambient tem- perature of 70 °F (20 °C) and 50% relative humidity for seven days before being placed into the B117 chamber. A matrix (Table 1) was designed to track the various coating/inhibitor combinations as follows: • Additive variables: ■ Eight different types of "tradi- tional" inhibitors containing zinc phosphates, calcium phosphates, strontium phosphates, etc. ◆ Products are typically added at a wt% (5%) of the total coating formula. ■ Four different types of VCIs con- taining proprietary blends of amine carboxylates. ◆ Products are typically added at a wt% (0.5 to 3%) of the total coating formula. For this exper- iment, they were added at 3%. • Coatings contained: ■ 32 combinations of traditional inhibitors and VCIs. ◆ Products were added at a reduced wt% (3%) of the total coating formula plus the VCIs at 3%. ■ Two combinations with VCIs ◆ Products were added to a wt% of 0.5 to 2.0% (Figure 2). Results The results shown in Table 2 were based on a visual inspection and rating. From the testing that was done, it is clear that VCIs are a viable solution for use as corrosion inhibi- tors in coatings. Figure 2 shows that VCIs by themselves have the ability to provide excel- lent corrosion protection. As evidenced, salt spray performance in many cases was matched by reducing the percentage of tradi- tional inhibitor used (recommended dosage of 5% by total formula weight to 3% by total 4 JUNE 2019 MATERIALS PERFORMANCE CORTEC SUPPLEMENT TO MP

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