Corrosion behavior of a CuCrNiAl alloy in the presence of NaCl deposit

摘要

The corrosion behavior of a CuCrNiAl alloy with NaCl deposit at 700 and 900oC was studied by means of met-alloscope, XRD, SEM/EDX, and thermogravimetric analysis. The results indicated that the corrosion of the CuCrNiAl alloy beneath the NaCl deposit is severe; the corrosion production is loose and easy to scale off; the Cr phase is easier to erode than the Cu phase, and the contents of Cu and Cr decrease when the content of Ni increases in the matrix of the alloy be-neath the corrosion region. The effects of distortion on the corrosion of the CuCrNiAl alloy were discussed, and the accel-eration mechanisms of NaCl on the corrosion were also discussed.