A comparison on the corrosion properties of commercially pure titanium (CP Ti, UNS R50400) and TI-3Al-2.5V (Ti 325, UNS R56320) in seawater is made basing the results of crevice corrosion, U-bend and electrochemical tests. Both metals have about the same corrosion resistance in seawater at temperatures up to 200°C. They have excellent resistance to stress corrosion cracking in boiling seawater, even under the steel coupling condition and the presence of sulfide ions in seawater. Nevertheless, small differences have been found. CP Ti is more resistant to pitting than Ti 325 in seawater at 50°C, but is less resistant to crevice corrosion than Ti 325 in seawater at 96°C. The addition of 200 ppm fluoride ions has greatly promoted the susceptibility of CP Ti and Ti 325 to crevice corrosion in seawater. Finally, seawater velocity at 3.1 m/sec did not change the corrosion resistance of Ti 325 in seawater at 160°C.

Subject
Marine environments, Ions, Fluorides, Seawater, Crevices, U bends, Crevice corrosion, Metals, Pitting, Titanium, Corrosion resistance, Titanium alloys, Stress corrosion cracking
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1989
Association for Materials Protection and Performance (AMPP)
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