Will titanium react with mild and/or stainless steel?

Discussion in 'Fiesta ST Engine Upgrades' started by Couldahadav8, Oct 17, 2014.

  1. Couldahadav8

    Couldahadav8 Active Member

    I was thinking of replacing section(s) of my exhaust with titanium exhaust pipe, but I am not sure whether it will react with steel. I was really hoping to just clamp a long straight section in to save some weight. Not planning to weld it. I have googled this, and the answer remains unclear to me. Seems aluminum pipe would have some definite issues (of multiple sorts) including corrosion, but I am still not sure about whether there is a steel-titanium reaction.

    Thanks in advance.

    Brent
     
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  3. WestcoastST

    WestcoastST Active Member

    You could get mild rusting of the steel where it contacts the titanium, depending on how you slip one over the other. If the titanium has a flared end so it sits outside of the steel, on both sides, there should be a little rust accumulating. More so if the titanium tube is the smaller tube in the two joints. Make sure you use stainless steel clamps or steel clamps, and you should be fine. Whether you have a problem or not in any galvanic couple depends on the amount of the two materials in contact, and how far away they are on the galvanic series. For example, aluminum rivets in a steel bulkhead will quickly corrode due to the ratio of the anode to the cathode sizes. Equal contact areas with materials closer together on the galvanic series, will not create as much corrosion. The only real reason for rusting will be moisture accumulation between the slip fit joints as the exhaust cools down.
     
    Couldahadav8 likes this.
  4. Couldahadav8

    Couldahadav8 Active Member

    Thanks for the info. I appreciate it.


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