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Figure 8 shows the Tafel plots of the steel coupons coated with the water-based acrylic resin containing LIGNO-PANI™ (A) as well as the coupons coated with only the water-based acrylic resin (B). The LIGNOPANI™ containing coating exhibits not only a significant shift to a higher OCP, but also 28 B. C. BERRY AND T. VISWANATHAN a lower corrosion current which translates into a lower corrosion rate. 4 JlA, respectively. The lower corrosion rate as well as the increased OCP for A indicates that the passive oxide layer is probably inhibiting the electron transfer between the electrolyte and the metal.

Crystal sizes were determined based on the (311) peak. Crystal sizes were found to be from 33 to 45 nm for the magnetite. The crystal size for the hematite in the sample was found to be 105 nm. Magnetic susceptibilities using a vibrating sample magnetometer or a SQUID have not yet been determined. Measurements, however, have been made using a magnetic susceptibility balance. Since magnetic susceptibility balances cannot measure susceptibilities in the ferromagnetic range directly, an alternate method was used.

More positive, open circuit potential (OCP) than the water-based coating alone. Figure 8 shows the Tafel plots of the steel coupons coated with the water-based acrylic resin containing LIGNO-PANI™ (A) as well as the coupons coated with only the water-based acrylic resin (B). The LIGNOPANI™ containing coating exhibits not only a significant shift to a higher OCP, but also 28 B. C. BERRY AND T. VISWANATHAN a lower corrosion current which translates into a lower corrosion rate. 4 JlA, respectively.

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