Crevice corrosion of titanium in high temperature sodium chloride solutions was investigated, Corrosion occurred only in very restricted crevices and attack was greater the higher the salt concentration. It was shown that crevice corrosion occurs because of the development of a low ( ~1) pH in the solution within the crevice and is net specific to chloride solutions. Crevice attack was demonstrated in iodide, bromide and sulfate solutions.
An electrochemical polarization technique was used to determine the effect of temperature and hydrogen and chloride ion concentrations on the corrosion of titanium and to determine the corrosion characteristics of several titanium alloys. Results indicate that titanium alloys containing sufficient molybdenum, nickel, or palladium are more resistant to nonoxidizing acid solutions than commercially pure titanium and, therefore, should be more resistant to crevice corrosion.
