What Are The Common Types Of Corrosion On GR5 Titanium Alloy?

1, crevice corrosion

In the metal component crevice or defects, due to electrolyte stagnation constitutes an electrochemical battery and cause local corrosion phenomenon, in neutral and acidic solution, titanium alloy crevice at the probability of contact corrosion is much greater than the alkaline solution, the contact corrosion does not occur in the entire surface of the crevice, but lead to local perforation damage.

2,Pitting phenomenon

Titanium in most salt solutions without pitting phenomenon, which occurs in non-aqueous solutions and boiling highly concentrated chloride solution, halogen ions in the solution of the titanium surface passivation film corrosion, and diffusion to the titanium internal pitting occurs, pitting aperture is smaller than its depth. Certain organic media will also be and titanium alloy pitting phenomenon in halogen solution, titanium alloy pitting in halogen solution generally occurs in high concentration and high temperature environment, in addition, in sulfide and chloride pitting requires specific conditions and limited.

3, Hydrogen embrittlement

Hydrogen embrittlement (HE), also known as hydrogen cracking or hydrogen damage, is one of the reasons for early failure of titanium alloys, titanium and its titanium alloy surface of the passivation film has a high strength, hydrogen embrittlement sensitivity increases with the intensity, so the passivation film hydrogen embrittlement is very sensitive.

4,Contact corrosion

The passivated oxide film on the surface of titanium promotes the titanium potential to move to a positive potential, which improves the resistance of titanium to corrosion by acidic and aqueous media. Due to the higher potential of the surface of titanium alloy, it is bound to cause contact corrosion with other metals in contact with the formation of electrochemical circuits and cause contact corrosion. Titanium alloys are susceptible to contact corrosion in the following two types of media:

Chemical composition

Mechanical Properties: Bar