Study on corrosion resistance of aircraft conduit connector of T-31 titanium alloy at simulated service environment

Corrosion resistance, airproof and oilproof property of aircraft conduit connector of T-31 titanium alloy were studied at simulated service environment by a conduit connector corrosion experiment system. The behaviors of surface corrosion and stress corrosion of the connectors were evaluated and the corrosion mechanism was investigated. The slight pitting was found just at stress focus place. The stress corrosion sensitivity of the connector was not observed at experiment stress level. It was proved that corrosion medium infiltrated the hole of anodic oxidation film and made the alloy corrosion slightly. The susceptibility of galvanic corrosion of stainless steels 1Cr18Ni9Ti contacted with titanium alloy T-31 in 6% NaCl solution was studied. It was shown that the galvanic corrosion current of galvanic couple was very low. It was demonstrated that the stainless steels 1Crl8Ni9Ti could be used to make the aircraft conduit connected with the connector made with T-31.