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Hot salt stress corrosion of titanium flanges and titanium alloy flanges

2021,09,02
Titanium flange despite good corrosion resistance, but in some environmental media may still be subject to corrosion and stress corrosion, which is more attention is first of all hot salt stress corrosion. Tests show that, in addition to pure titanium, almost all titanium flange in high temperature, stress and the presence of halides (such as NaF, NaCl, NaBr, NaI) under the working environment, have the same degree of hot salt stress corrosion tendency. For most alloys, hot salt stress corrosion sensitive temperature range must be 288-427 ℃. Corrosion tendency and alloy composition, processing history and other metallurgical factors, high alumina and high oxygen alloy and b processing or b treatment of coarse crystal Weiss organization is more sensitive to stress corrosion.
 
Hot salt stress corrosion caused by metal embrittlement is believed to be related to hydrogen embrittlement at high temperatures and stress, halide hydrolysis occurs, generating HCl gas, HCl further action with titanium, generating hydrogen, namely
NaCl ten H20-HCl ten NaOH
2HCl ten Ti-TiCl2 ten 2H
In addition to hot salt stress corrosion, titanium flange has red fuming nitric acid, N204, containing hydrochloric acid, sulfuric acid in methanol solution has a certain degree of stress corrosion tendency, when with sharp notch specimens for stress corrosion test, containing 3.5% NaCl aqueous solution may reduce the corrosion fracture life.
 
Titanium flange stress corrosion tendency and alloy composition and heat treatment related to increase the content of aluminum, tin, oxygen are metallurgical accelerated stress south corrosion. On the contrary, the alloy added b stabilizing elements, such as aluminum, vanadium, group, silver, etc. has the effect of alleviating stress corrosion. Titanium flange still have liquid metal embrittlement tendency such as molten cadmium and titanium contact will cause cadmium brittle, mercury out of a similar effect. Above 340 ℃, silver can promote TA7 and other alloys corrosion cracking.
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