Inspectioneering
Explore this topic

Overview of CO2 Corrosion

CO2 Corrosion is a form of degradation that occurs when dissolved CO2 in condensate forms carbonic acid (H2CO3), which corrodes steels and low alloys to form an iron carbonate scale.  CO2 corrosion is most typically found in boiler condensate return systems that are not adequately treated with corrosion inhibitors. 

The rate of corrosion in materials affected by CO2 corrosion is dependant on several factors such as the concentration of CO2 in the environment, the operating conditions in which the components work, and the type of materials they are composed of. It’s also important to be aware of the water chemistry that is going on around the equipment; for example, alkaline water that has been de-aerated can build up incredibly high CO2 levels.

Water analysis is the best way to detect condensate problems that may lead to leaks in condensate return systems. Radiography or ultrasonic thickness measurements on the bottom of condensate piping and on the back side of elbows or other areas of higher velocity and/or turbulence may also detect localized thinning typical of condensate corrosion.  To better avoid CO2 corrosion, one should adequately treat condensate return systems with corrosion inhibitors and upgrade various affected components to 304 SS.

 

Is this definition incomplete? You can help by contributing to it.

Share this Topic

Articles about CO2 Corrosion

    Inspectioneering Journal

    Explore over 20 years of articles written by our team of subject matter experts.

    Company Directory

    Find relevant products, services, and technologies.

    Job Postings

    Discover job opportunities that match your skillset.

    Case Studies

    Learn from the experience of others in the industry.

    Event Calendar

    Find upcoming conferences, training sessions, online events, and more.

    Industry News

    Stay up-to-date with the latest inspection and asset integrity management news.

    Blog

    Read short articles and insights authored by industry experts.

    Acronyms

    Commonly used asset integrity management and inspection acronyms.

    Asset Intelligence Reports

    Download brief primers on various asset integrity management topics.

    Videos

    Watch educational and informative videos directly related to your profession.

    Expert Interviews

    Inspectioneering's archive of interviews with industry subject matter experts.