NACE TM0294

Abstract

Scope: Accelerated testing of anodes for use in concrete is intended to provide an indication of an anode’s ability to perform satisfactorily for a specific number of years. Unfortunately, accelerated life testing cannot be conducted in concrete because testing at high-current levels results in premature failure of the concrete as the test electrolyte. Accelerated life testing must therefore be conducted in an aqueous solution.  Test Method Part A is designed to evaluate the anode material to an expected lifetime criterion, and is conducted over a period of at least 180 days. (See Section 3.)  Test Method Part B uses accelerated life testing to verify that anodes comprised of a Ti substrate, to which a mixed metal oxide (MMO) catalytic coating has been applied, meet minimum service-life requirements in accordance with the expected design life. The test is operated at higher current densities than the application’s design to accelerate the time to failure. (See Section 8.)  The minimum test period is 65 hours for anodes with an expected design life of 100 years at a maximum current density of 108 mA/m2 (10 mA/ft2). The minimum test period is 78 hours for anodes with an expected design life of 120 years at a maximum current density of 108 mA/m2 (10 mA/ft2).