Corrosion protecion of steel pile

Corrosion protecion of steel pile - Corrosion and...

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Yoshikazu Akira, Dr. Eng. Researcher Port and Airport Research Institute Email: akira@pari.go.jp
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Independent Administrative Institution P ort and A irport R esearch I nstitute Aiming for technologies that can contribute to the world Its primary goal is facilitating the smooth and efficient construction of port and airports. Another major goal is researching, developing, and improving technologies for constructing ports and airports. Research fields (2006-2011) n Research on infrastructure for homeland security n Research for the creation of a comfortable and beautiful homeland n Research on infrastructures for a vigorous society and economy
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Independent Administrative Institution P ort and A irport R esearch I nstitute Materials group Long-term exposure test pier in Hasaki (1984~) Exposure test site in PARI (1964~) n Corrosion and corrosion protection of steel structures n Durability of materials n Maintenance of port and airport facilities n Others
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Contents n Corrosion of steel Ø Corrosion Mechanism of Steel Ø Corrosion of steel in under ground Environment Ø Corrosion of steel in marine environment n Corrosion Protection of steel Structures Ø Corrosion control using thickness allowance for corrosion Ø protection methods
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Port facilities - Landing pier
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Airport facilities - D runway in HANEDA airport 2020m 1100m http://www.pa.ktr.mlit.go.jp/haneda.html reclamation Pier (Jacket) Design service life: 100 years Cathodic protection (Galvanic anode method, Al Alloy) Stainless steel coating (PRE:44~, Thickness:0.4mm) Titanium Cover Corrosion Protection of Steel Structures
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Corrosion Mechanism of Steel (1) Fe(OH) 2 Fe(OH) 2 Neutrality environment Steel 2e - H 2 O+1/2O 2 2OH - 2e - 2OH - H 2 O+1/2O 2 Fe 2+ Fe 2+ anode cathode cathode
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Corrosion Mechanism of Steel (1) Fe(OH) 2 Fe(OH) 2 Neutrality environment Steel 2e - H 2 O+1/2O 2 2OH - 2e - 2OH - H 2 O+1/2O 2 Fe 2+ Fe 2+ anode cathode cathode Influence of environment Dissolved Oxygen Temperature Fluid velocity etc
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Deterioration case of steel pipe pile
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Corrosion environments and corrosion tendencies in marine environment Mean High Water Level (MHWL) Corrosion rate 2. Splash zone 1. Marine atmosphere (Without corrosion protection) < 0.1 mm/year 0.3 mm/year Concentrated Corrosion Occurrence at just below MLWL Mean Sea Level(MSL) Mean Low Water Level (MLWL) Depth 3. Tidal zone 4. Submerged zone 5. Below the Sea bottom Sea bottom 0.1-0.3 mm/year 0.1-0.2 mm/year 0.03 mm/year
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Mechanism of concentrated corrosion under marine environment Macro cell corrosion is caused by the difference of the Dissolved Oxygen (DO) concentration. Anode : Fe Fe 2+ + 2e - (Corrosion) Cathode : O 2 + 2H 2 O +4e - 4OH - Tidal zone Submerged zone DO : high DO : low Cathode Anode Splash zone
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Applicable protection methods for port steel structures Marine atmosphere Splash zone Protective co Tidal zone Submerged zone Below the sea bottom oating Cathodic protection M.L.W.L. -1m M.L.W.L.
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Corrosion protecion of steel pile - Corrosion and...

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