ICDS12 International Conference DURABLE STRUCTURES: from construction to rehabilitation LNEC Lisbon Portugal 31 May - 1 June 2012 DURABLE STRUCTURES
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1 International Conference : from construction to rehabilitation Objective CORROSION PROTECTION OF STEEL STRUCTURES Scheme of presentation Introduction Corrosion protection systems: Paint systems Metallic coatings Conclusion Hugo Perneta, Maria João Correia and Manuela Salta Presentation of the most commonly used corrosion protection systems, identifying the most important factors for an effective protection of steel structures EN 12473:2000, General principles of cathodic protection in sea water. EN 14505:2005, of complex structures. EN 13174:2001, for harbour installations. Several parts of EN ISO 12944, Paints and varnishes Corrosion protection of steel structures by protective paint systems. Several parts of EN ISO 14713, Zinc coatings Guidelines and recommendations for the protection against corrosion of iron and steel structures. Several parts of EN ISO 8504, Preparation of steel substrates before application of paints and related products Surface preparation methods. CORROSION PROTECTION OF STEEL STRUCTURES 2
2 International Conference : from construction to rehabilitation Introduction Main deterioration mechanisms of steel structures: Corrosion Fatigue Corrosion may be prevented by: Steel isolation from the surrounding environment Design of the structure Action on the steel CORROSION PROTECTION OF STEEL STRUCTURES 3 Introduction Corrosion performance depends on: Type of metal or alloy and its microstructure Exposure conditions Corrosivity categories (ISO 9223 and EN ISO ): Atmospheric C1 very low C2 low C3 average C4 high C5 very high (marine and industrial) Water and soil Im1 fresh water Im2 sea or brackish water Im3 soils Matosinhos C4 Viana do Castelo C3 Leixões >C5 Lavos C4 Lumiar C3 Lisboa C3 Barreiro C3/C4 Sines >C5 Alto Rabagão C2 Macedo de Cavaleiros C2 Alfazina C3 CORROSION PROTECTION OF STEEL STRUCTURES 4 Maia >C5 Pego C2/C3 Seia C2 Vila Velha de Ródão C2/C3 Reguengos de Monsaraz C2
3 International Conference : from construction to rehabilitation CORROSION PROTECTION OF STEEL STRUCTURES 5 EN 12954:2001, of buried or immersed metallic structures. General principles and application for pipelines EN 14505:2005, of complex structures. EN 12473:2000, General principles of cathodic protection in sea water EN 13174:2001, for harbour installations EN 13509:2003, measurement techniques EN 50162:2004, Protection against corrosion by stray current from direct current systems. CORROSION PROTECTION OF STEEL STRUCTURES 6
4 International Conference : from construction to rehabilitation [1] Aapted from: (Viewed in 07/10/2011) CORROSION PROTECTION OF STEEL STRUCTURES 7 EN ISO 12944, Paints and varnishes Corrosion protection of steel structures by protective paint systems: Part 1: General introduction Part 2: Classification of environments Part 3: Design considerations Part 4: Types of surface and surface preparation Part 5: Protective systems. Part 6: Laboratory performance test methods. Part 7: Execution and supervision of paint work. Part 8: Development of specifications for new work and maintenance. [1] CORROSION PROTECTION OF STEEL STRUCTURES 8
5 International Conference : from construction to rehabilitation Hot dip galvanization Sherardizing Thermal spraying Electrodeposition Several parts of EN ISO 14713, Zinc coatings Guidelines and recommendations for the protection against corrosion of iron and steel structures EN 14616:2004, Thermal spraying Recommendations for thermal spraying EN ISO 2063:2005, Thermal spraying Metallic and other inorganic coatings Zinc, aluminium and their alloys Several parts of EN ISO 14922, Thermal spraying Quality requirements of thermally sprayed structures EN 1403:1998, Corrosion protection of metals Electrodeposited coatings Methods of specifying general requirements EN ISO 4042:1999, Fasteners Electroplated coatings PROTECTION OF STEEL STRUCTURES 9 Metallic coating Paint systems Duplex system Sinergic effect on durability Several parts of EN ISO 12944, Paints and varnishes Corrosion protection of steel structures by protective paint systems. Several parts of EN ISO 14713, Zinc coatings Guidelines and recommendations for the protection against corrosion of iron and steel structures EN 14616:2004, Thermal spraying Recommendations for thermal spraying EN ISO 2063:2005, Thermal spraying Metallic and other inorganic coatings Zinc, aluminium and their alloys Several parts of EN ISO 14922, Thermal spraying Quality requirements of thermally sprayed structures EN 1403:1998, Corrosion protection of metals Electrodeposited coatings Methods of specifying general requirements EN ISO 4042:1999, Fasteners Electroplated coatings CORROSION PROTECTION OF STEEL STRUCTURES 10
6 International Conference : from construction to rehabilitation PROTECTION OF STEEL STRUCTURES 11 PROTECTION OF STEEL STRUCTURES 12
7 International Conference : from construction to rehabilitation PROTECTION OF STEEL STRUCTURES 13 Dry abrasive Centrifugal Compressed-air Blast cleaning Wet abrasive Slurry Other application Sweep Vaccum or suctionhead Moistureinjection Compressedair Pressurizedliquid PROTECTION OF STEEL STRUCTURES 14 Spot Water
8 International Conference : from construction to rehabilitation PROTECTION OF STEEL STRUCTURES 15 Conclusion Main causes of corrosion: Design and construction errors Inadequate maintenance of the protection system Resulting from other deterioration processes CORROSION PROTECTION OF STEEL STRUCTURES 16
9 International Conference : from construction to rehabilitation Acknowledgments The information included in this presentation is developed in Duratinet Technical Guide Maintenance and Repair of Transport Infrastructure, Part III, Vol. 5, prepared within the ambit of project No. 049/2009 DURATINET - Durable Transport Infrastructures in the Atlantic Area Network, approved by the Atlantic Area Transnational Programme, co-financing by the ERDF. A summarized web version of Duratinet Technical Guide may also be found in the following address: CORROSION PROTECTION OF STEEL STRUCTURES 17
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