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SUMMARY:Modelling the corrosion of steel infrastructure in marine environm
 ents for long-term reliability assessment - Prof Robert Melchers (Centre f
 or Infrastructure Performance and Reliability\, Newcastle University in Au
 stralia)
DTSTART:20070607T130000Z
DTEND:20070607T140000Z
UID:TALK7260@talks.cam.ac.uk
CONTACT:Nami Norman
DESCRIPTION:The assessment and prediction of the future life of new infras
 tructure and the remaining life of existing\, perhaps already corroding\, 
 infrastructure requires estimation of likely future deterioration of syste
 m strength and performance. This requires models for likely corrosion loss
  and for likely maximum pit depth. For reliability assessments such models
  should be probabilistic and allow for environmental influences and materi
 al properties. An overview will be given of recent research to develop hig
 h quality models based on fundamental characteristics of steel corrosion. 
 The models are complex non-linear functions of time since it has been show
 n that the controlling corrosion process changes from initiation to oxidat
 ion to bacterial-influenced corrosion. A constant ‘corrosion rate’ as 
 commonly assumed by engineers is seldom valid and can be very misleading. 
 The model applies to marine immersion\, tidal\, splash and coastal atmosph
 eric corrosion. For immersion corrosion the effects of water temperature\,
  dissolved oxygen levels\, nutrient pollution\, depth\, water velocity and
  water salinity are reviewed and the effect of small changes in steel comp
 osition outlined. 
LOCATION:Engineering Department - **LR3B** ** 2pm**
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