An interesting paper published in » Engineering Failure Analysis » on www.sciencedirect.com, Volume 57, November 2015.
Lightning protection system elements need to be selected from materials which are resistant to corrosion and should be protected from fast degradation. However, over the time corrosion will take place in the presence of galvanically dissimilar metals in the same electrolyte (moisture)……
This paper presents the causes of corrosion and recent developments in minimising the corrosion associated with lightning protection and grounding systems.
A commercial gas velocity sensor used for flue gases monitoring was subject to severe corrosion failure. A combination of mechanisms was proposed including a dominating 5 severe dew point corrosion for both transducer and its covering, galvanic attack and an eventual hydrogen attack for the transducer side part. Recommendations were proposed to avoid a future severe damage to such type of sensor including an insulation between transducer and covering metals and an up-grade of the titanium alloy used.