Improving passivation of carbon steel in steam cycles of power plants with a film forming amine

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Different types of corrosion phenomena present a threat for economical, uninterrupted and safe operation of both conventional and nuclear power plants. Many types of corrosion damage are induced by impurities that tend to accumulate in crevices or beneath corrosion product deposits. Especially important phase for corrosion protection is during different transitions, shut-downs and at two-phase regions. Several efforts for decreasing general corrosion rate and thereby also corrosion product accumulation on power plant surfaces have been done by changing the plant water chemistry. One very promising protecting method is treating systems with film-forming amines (FFA), such as octadecylamine (ODA). FFAs form a thin, some nanometers in thickness, film on metallic surfaces. Application of ODA decreases the rate of flow assisted corrosion (FAC) in the feed water line and thus reduces the amount of iron oxide that is available for deposition. ODA has also been observed to decrease the amount of crevice corrosion and stress corrosion cracking by hindering the enrichment of chloride ions and changing electrochemical properties of the surface. Recent studies at VTT show that at high temperatures (T=228-300°C) under ammonia water chemistry, ODA reduces carbon steel corrosion rate by a factor of three and that the once-formed film also remains stable at surfaces at high temperatures.
    Original languageEnglish
    Title of host publicationBaltica X
    Subtitle of host publicationInternational Conference on Life Management and Maintenance for Power Plants
    EditorsPertti Auerkari
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages7
    ISBN (Electronic)978-951-38-8436-9, 978-951-38-8435-2
    Publication statusPublished - 2016
    MoE publication typeA4 Article in a conference publication
    EventBALTICA X - International Conference on Life Management and Maintenance for Power Plants - Cruise, Helsinki-Stockholm, Finland
    Duration: 7 Jun 20169 Jun 2016

    Publication series

    SeriesVTT Technology
    Volume261

    Conference

    ConferenceBALTICA X - International Conference on Life Management and Maintenance for Power Plants
    Abbreviated titleBaltica X
    CountryFinland
    CityHelsinki-Stockholm
    Period7/06/169/06/16

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  • Cite this

    Jäppinen, E., Saario, T., & Sipilä, K. (2016). Improving passivation of carbon steel in steam cycles of power plants with a film forming amine. In P. Auerkari (Ed.), Baltica X: International Conference on Life Management and Maintenance for Power Plants VTT Technical Research Centre of Finland. VTT Technology, Vol.. 261 http://www.vtt.fi/inf/pdf/technology/2016/T261.pdf