Crevice corrosion properties of Ti-0.2 wt.% Pd alloy and pure Ti in hot 6% NaCl solution were investigated. Pure Ti specimens exhibited severe corrosion, while Ti-0.2% Pd alloy specimens were virtually immune to crevice corrosion in an accelerated tes...
Crevice corrosion properties of Ti-0.2 wt.% Pd alloy and pure Ti in hot 6% NaCl solution were investigated. Pure Ti specimens exhibited severe corrosion, while Ti-0.2% Pd alloy specimens were virtually immune to crevice corrosion in an accelerated test.
An electrochemical polarization technique was used to determine the effect of Pd-addition to Ti. It was found that Ti-0.2% Pd alloy retained passivity in an acid solution of the same concentration developed in the crevice. This result indicates that Pd acts as a cathodic depolarizer to shift the potential of Ti in the noble direction. It is therefore concluded that small addition, namely, 0.2% of Pd effectively improves the resistance of Ti to crevice corrosion in a hot brine.