Abstract
Abstract The effect of cerium boride (CeB6) addition on the stress corrosion cracking (SCC) susceptibility of Alloy 600 (UNS N06600) was investigated in a 40% sodium hydroxide (NaOH) solution at 315°C using slow strain rate tests (SSRT). Alloy 600, when strained at open-circuit potentials (OCP), failed completely in a pure ductile mode in the solution containing CeB6, while the alloy was susceptible to intergranular stress corrosion cracking (IGSCC) in pure 40% NaOH solution. Polarization curves were measured for the same conditions. The corrosion current densities were estimated using the four-point method and the linear polarization method. The corrosion current density of the alloy in the 40% NaOH solution was significantly decreased by the addition of CeB6 to the solution. The inhibition of IGSCC was attributed to the reduced corrosion current density.
Published Version
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