Corrosion behavior of CuCrNiAl alloy in HC1 solutions

The corrosion behavior of a CuCrNiAl alloy in HC1 solutions was studied by means of metallograph, XRD, SEM/EDX and TEM methods. The results show that in low concentration of HC1 solutions, Cu of CuCrNiAl alloy is more easily subject to corrsion than Cr; the dechromisation of the CuCrNiAl alloy occurs at a certain concentration of HC1 solutions, at the same time Al of CuCrNiAl alloy is subject to corrosion also. The dechromisation corrosion occurs initially at the interface between Cr phase and Cu phase, then it gradually extends Cr phase until Cr phase is dissolved completely. It is also revealed that the tendency of dechromisaion of the CuCrNiAl alloy increases with the increase in concentration and temperature of HC1 solutions.