Accelerated corrosion of MoO3-deposited copper

The accelerated oxidation kinetics of MoO3-deposited copper were studied in the temperature range of 480–700 °C in air. The accelerated oxidation followed the parabolic-rate law, indicating that the process was diffusion-controlled. Oxygen diffusion along liquid channels in the oxide scale was inferred to be the rate-limiting step in the overall mechanism. The rate constant increased from 9.2 × 10−6 to 3.8 × 10−5 kg2 m−4 s−1 with increasing the deposit mass from 0.3 to 0.9 kg m−2 at 700 °C.

► In this study, we have established the kinetics of accelerated corrosion of MoO3-deposited copper. ► A mechanism of the accelerated oxidation was developed. ► It was shown that the oxygen diffusion in the oxide scale is the rate-limiting step in the overall mechanism.