VTT ProperScan Materials Environment Corrosion in contact with surrounding environment Contact:

Transcription

1 VTT ProperScan Materials Environment Corrosion in contact with surrounding environment Contact: Leena Carpén, Pauliina Rajala,

2 Corrosion problems? Difficult conditions? Material damages? Changed process conditions? What material can be used? We can help you with sophisticated monitoring, field studies, testing and analysis Some of the most important methods, their applicability and benefits are presented in the following slides 16/06/2016 2

3 Water circuit Materials performance in water cycles Corrosion Fouling Heat transfer capability Affectivity of anti-foulants Applications Cooling water systems Process water cycles Domestic water systems 16/06/2016 3

4 Deposit monitoring Deposit formation under simulated systems Heat exchangers Real-time monitoring of deposits formation and properties Inorganic and organic fouling Applications: Cooling water cycles Domestic water cycles Fire water protection systems 16/06/2016 4

5 Crevice corrosion Crevice corrosion testing of different materials Crevice corrosion in various environments Electrochemical methods: Critical crevice temperature (CCT) Exposure specimens 16/06/2016 5

6 Pitting Materials susceptibly to pitting Electrochemical methods: Critical pitting potential (CPP) Critical pitting temperature (CPT) Exposure specimens 16/06/2016 6

7 Electrochemical monitoring What? Type of corrosion Corrosion rates Surface phenomena Where? Possibility to use modified atmospheres (i.e. anoxic) Stagnant water conditions or slow flow rate Applications Fire protection water systems Geological repositories 16/06/2016 7

8 Stress corrosion cracking (SCC) Stress corrosion cracking (SCC) studies in demanding industrial process environments Conventional and tailored testing methods for SCC 16/06/2016 8

9 Field studies On-line measurements with corrosion coupons, resistance-wire electrodes or electrochemical measurement techniques in plant provide in-process information on the corrosion behaviour of the components and structural materials. 16/06/2016 9

10 Microbiologically induced corrosion Identification and quantification of microbes in corrosion sites and surfaces Material performance in presence of microbes Microbial metabolites and their effect on corrosion Gene copies cm Microbes in corrosion pits on surface of carbon steel 1000 Bacterial 16S rrna 100 Sulphate reducers (dsrb) 10 Methanogens (mcra) 16/06/ CS drill hole ACS drill hole B

11 Surface analysis Various surface analyses applicable to failure sites in field conditions or laboratory experiments Ability to characterize surface deposits, corrosion products and morphology of surface Examples Stereo- and optical microscopy SEM, EDS XRD Surface roughness 16/06/

12 Publications P. Rajala, M. Raulio, L. Carpén, M. Vepsäläinen, E. Sohlberg, M. Bomberg: Microbially induced corrosion of carbon steel in deep groundwater environment. Frontiers in Microbiology 08/2015; 6. DOI: /fmicb L. Carpén, P. Rajala, M. Bomberg: Microbially Induced Corrosion in Deep Bedrock. Advanced Materials Research 01/2015; 1130: DOI: / P. Kinnunen, M. Bomberg, P. Rajala, L. Carpén: Industrial Views to Microbe-Metal Interactions in Sub-Arctic Conditions. Advanced Materials Research 01/2015; 1130: DOI: / H. Kutvonen, P. Rajala, L. Carpén, M. Bomberg: Nitrate and ammonia as nitrogen sources for deep subsurface microorganisms. Frontiers in Microbiology 11/2015; 6. DOI: /fmicb L. Carpén, P. Rajala, M. Vepsäläinen, M. Bomberg, M. Raulio: Microbial diversity and corrosion behaviour of carbon steel and stainless steel after one-year exposure in alkaline ground water. NACE 2014, San Antonio, Texas, USA; 03/2014 P. Rajala, L. Carpén, M. Vepsäläinen, M. Raulio, M. Bomberg: Microbially induced corrosion of carbon steel and stainless steel in alkaline ground water - composition and metabolic functionality of biofilm. Waste Management Conference 2014, Phoenix, Arizona, USA; 03/2014 L. Carpén, P. Rajala, M. Bomberg: Real-Time Electrochemical Measurements of Carbon Steel in Ground Water with Sulfate Reducing Bacteria Enrichment. The annual Waste Management Conference 2015, Phoenix, Arizona, USA; 03/2015 P. Rajala, L. Carpén, M. Raulio: SRB and methanogens in corrosion of steel in anaerobic water.. 19th International Corrosion Congress, Jeju, Republic of Korea; 11/2014 L. Carpén, P. Rajala, M. Vepsäläinen, M. Bomberg: Corrosion behaviour and biofilm formation on carbon steel and stainless steel in simulated repository environment. Eurocorr2013, Estoril, Portugal; 09/2013 L. Hilbert, L.Carpén, P. Moller, F. Fontenay, T. Mathiesen Unexpected corrosion of stainless steel in low chloride waters - microbial aspects. Nice, FR: EFC. Eurocorr The European Corrosion Congress, 6-10 September 2009, Nice, France P. Pohjanne, L. Carpén, T. Hakkarainen, P. Kinnunen A method to predict pitting corrosion of stainless steels in evaporative conditions. Journal of Constructional Steel Research, Vol. 64, No. 11, pp L. Carpén, Y. Miyano, T. Kaunisto, P. Pohjanne Tools and methods for detecting metal dissolution in potable water. The European Corrosion Congress Proceedings, Freiburg, Germany 9-13 September EFC Event Nr. 289, EFC Event Nr. 289, 12 s. L. Carpen, L. Raaska, K. Kujanpää, T. Hakkarainen Effects of Leptothrix discophora on the potential behavior of stainless steel. Materials and Corrosion, Vol. 54, No. 7, pp P. Uutela, K. Mattila, L. Carpén, L. Raaska, T. Hakkarainen, M. Salkinoja-Salonen Biogenic thiosulfate and oxalate in paper machine deposits connected to corrosion of stainless steels. International Biodeterioration & Biodegradation, Vol. 51, No. 1, pp K. Mattila, L. Carpén, L. Raaska, H-L. Alakomi, T. Hakkarainen, M. Salkinoja-Salonen, Mirja Impact of biological factors on the ennoblement of stainless steel in Baltic seawater. Journal of Industrial Microbiology & Biotechnology, Vol. 24, pp /06/

13 Contact persons at VTT: - Leena Carpén, leena.carpen@vtt.fi, Pauliina Rajala, pauliina.rajala@vtt.fi,