Author(s)

M. Ahsan & Z. Gasem

Abstract

The main objective of this study is to examine the inhibition effect of chromate on corrosion fatigue crack growth in a super duplex stainless steel alloy. Corrosion fatigue crack propagation tests were performed for Zeron 100 in air, 3.5% NaCl, and in 3.5% NaCl inhibited with sodium chromate (Na2CrO4) using two chromate concentrations. Specimens were tested in the TL orientation. Results show that crack growth rates are enhanced in 3.5% NaCl solution relative to air over the entire range of ∆K tested. Addition of 0.02 M Na2CrO4 to 3.5% NaCl solution results in notable decreases in crack growth rates up to a specific value of ∆K above which crack growth rates approach values measured in pure 3.5% NaCl solution. When the chromate concentration is increased by ten fold, corrosion fatigue crack growth rates are markedly

Keywords