Probabilistic Model for Marine Corrosion of Steel for Structural Reliability Assessment

The assessment of the remaining safe and serviceable life of deteriorating structures using structural reliability theory requires realistic models for corrosion. Using existing data it is shown that corrosion is a nonlinear function of time. A probabilistic model for "at-sea" immersion corrosion of mild and low alloy steels based on fundamental physiochemical corrosion mechanics is presented. The mean-value part of the model is made operational by calibrating its parameters to existing and new field data. A simple model for corrosion uncertainty is presented and its initial calibration discussed. More refined calibration awaits field data over practically significant seawater temperature ranges but particularly for lower temperature regimes. Extensions to the model and its application to other exposure regimes are outlined briefly.

[1]  C. P. Larrabee,et al.  Corrosion of Steels in Marine Atmospheres and in Sea Water , 1945 .

[2]  Richard D. Granata,et al.  Assessing Corrosion on Steel Structures Using Corrosion Coulometer , 1996 .

[3]  Bopinder S. Phull,et al.  Seawater Corrosivity Around The World: Results From Five Years of Testing , 1997 .

[4]  G. M. Ferrari,et al.  Development of high strength low alloy steels for marine applications: Part 1: Results of long term exposure tests on commercially available and experimental steels , 1986 .

[5]  Robert E. Melchers,et al.  Structural Reliability: Analysis and Prediction , 1987 .

[6]  J. F. Stanners,et al.  3.2 – Low-alloy Steels , 1994 .

[7]  C. R. Southwell,et al.  Part 3—Underwater Corrosion of Ten Structural Steels Corrosion of Metals in Tropical Environments , 1960 .

[8]  W. Hamilton,et al.  Biocorrosion: the action of sulphate-reducing bacteria , 1994 .

[9]  Robert E. Melchers,et al.  Modeling of Marine Immersion Corrosion for Mild and Low-Alloy Steels—Part 2: Uncertainty Estimation , 2003 .

[10]  M. Schumacher,et al.  Seawater corrosion handbook , 1979 .

[11]  Robert E. Melchers,et al.  Effect of Temperature on the Marine Immersion Corrosion of Carbon Steels , 2002 .

[12]  B. B. Chernov.  PREDICTING THE CORROSION OF STEELS IN SEA WATER FROM ITS PHYSICOCHEMICAL CHARACTERISTICS , 1990 .

[13]  M. Benarie,et al.  A general corrosion function in terms of atmospheric pollutant concentrations and rain pH , 1986 .

[14]  Robert E. Melchers,et al.  Modeling of Marine Corrosion of Steel Specimens , 1997 .

[15]  R. A. Legault,et al.  Kinetics of the Atmospheric Corrosion of Low-Alloy Steels in an Industrial Environment , 1975 .

[16]  Richard I. Ray,et al.  Relationship Between Corrosion and the Biological Sulfur Cycle: A Review , 2000 .

[17]  William H. Hartt,et al.  Sacrificial anode cathodic polarization of steel in seawater. Part 2: Design and data analysis , 1998 .

[18]  Francis L. LaQue,et al.  MARINE CORROSION--CAUSES AND PREVENTION , 1975 .

[19]  R. Melchers.  Modeling of Marine Immersion Corrosion for Mild and Low-Alloy Steels—Part 1: Phenomenological Model , 2003 .

[20]  C R Southwell,et al.  CORROSION OF METALS IN TROPICAL WATERS, STRUCTURAL FERROUS METALS , 1970 .

[21]  G. Kreysa,et al.  Dechema corrosion handbook : corrosive agents and their interaction with materials , 1987 .

[22]  Masayuki Tanimura,et al.  Corrosion Behavior of Low Alloy Steels in Sea Water , 1972 .

[23]  Robert E. Melchers.  Probabilistic Modelling of Marine Corrosion of Steel Specimens , 1995 .

[24]  C. P. Larrabee,et al.  Corrosion Resistance of High-Strength Low-Alloy Steels As Influenced by Composition and Environment , 1953 .

[25]  J. Crolet.  Mechanisms of uniform corrosion under corrosion deposits , 1993, Journal of Materials Science.

[26]  Denny A. Jones.  Principles and prevention of corrosion , 1991 .

[27]  U. R. Evans,et al.  The Corrosion and Oxidation of Metals: Scientific Principles and Practical Applications , 1960 .

[28]  R. Melchers.  Corrosion uncertainty modelling for steel structures , 1999 .