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.

More information : sciencedirect.com/science/article