CORROSION AND ITS PROTECTION A Review paper

2015

Corrosion is one of the major reasons for wear and tear of equipments. It is also responsible for reducing the life of equipments. Many accidents occur because of failure of pipelines due to corrosion. There are many methods to minimize corrosion. Cathodic protection, use of inhibitors, use of anticorrosive coatings is few methods used for this purpose. The presence of moisture in the atmosphere favours the corrosion. Various investigators have carried out research on various aspects of corrosion. Humidity and temperature are two important parameters in addition to metal properties and chemicals involved in the process. Use of green inhibitors is new trend in corrosion control. The current review summarizes research carried out on corrosion and its control.

Jnl of Aust. Inst. Steel Construction, 1996

This paper looks at the factors which influence corrosion and how these influence corrosion control measures. The second part looks at coatings which can be used for corrosion protection of steel

Corrosion is degradation of material's properties due to interactions with environment. Like other natural hazards such as earthquakes or severe weather disturbances, corrosion can cause dangerous and expensive damage to everything from automobiles, home appliances, and drinking water systems, pipelines, bridges, and public buildings. The current work reviews the phenomenon, impact, forms, consequences and preventive measures of corrosion with special emphasis on corrosion of steel structures. Different techniques like coating, painting, plating and Cathodic Protection are also reviewed in the current work.

A very brief paper on Corrosion

Two methods of combating corrosion which are widely used in New Zealand are cathodic protection and chemical inhibitors. Both methods depend on controlling the charge on the metal surface, and this can be monitored by measuring the potential of the metal. The conditions needed to stop corrosion can then be predicted from an electrochemical phase diagram. Cathodic protection is effected by forcing the potential to a negative region where the metal is completely stable. This can be done by using a sacrificial anode made from a more reactive metal, or using an external power supply to change the amount of charge on the metal surface. Cathodic protection is well suited to steel structures in marine or underground environments. There is a class of chemical inhibitors which work by removing electrons from the metal, thereby pushing the potential into a positive region where an oxide film spontaneously forms. This results in a stable, passive surface with a very low corrosion rate. Industries apply this technology in processes where the inhibitor can be conveniently added without causing environmental or health problems.

1 DEFINITION AND IMPORTANCE OF CORROSION 2 ELECTROCHEMICAL MECHANISMS 3 THERMODYNAMICS: CORROSION TENDENCY AND ELECTRODE POTENTIALS 4 THERMODYNAMICS: POURBAIX DIAGRAMS 5 KINETICS: POLARIZATION AND CORROSION RATES 6 PASSIVITY 7 IRON AND STEEL 8 EFFECT OF STRESS 9 ATMOSPHERIC CORROSION 10 CORROSION IN SOILS 11 OXIDATION 12 STRAY-CURRENT CORROSION 13 CATHODIC PROTECTION 14 METALLIC COATINGS 15 INORGANIC COATINGS 16 ORGANIC COATINGS 17 INHIBITORS AND PASSIVATORS 18 TREATMENT OF WATER AND STEAM SYSTEMS 19 ALLOYING FOR CORROSION RESISTANCE; STAINLESS STEELS 20 COPPER AND COPPER ALLOYS 21 ALUMINUM AND ALUMINUM ALLOYS 22 MAGNESIUM AND MAGNESIUM ALLOYS 23 NICKEL AND NICKEL ALLOYS 24 COBALT AND COBALT ALLOYS 25 TITANIUM 26 ZIRCONIUM 27 TANTALUM 28 LEAD 29 APPENDIX

Environmental and Industrial Corrosion - Practical and Theoretical Aspects, 2012

Corrosion is the deterioration of materials by chemical interaction with their environment.

Environmental and Industrial Corrosion - Practical and Theoretical Aspects, 2012

2006

Acknowledgments xvi Suggested reading Keywords 9 Selection of materials for corrosive environment 9.1 Introduction 9.2 Factors affecting the performance of materials 9.3 The material selection process 9.4 Materials classification 9.5 Materials and fluid corrosivity 9.6 Ranking of performance of materials 9.7 Electrolyte factors 9.8 Corrosion indices 9.9 Iso-corrosion charts 9.10 Cost effectiveness 9.11 Selection of materials for corrosive environments 9.12 Corrosion characteristics of carbon and low alloy steels 9.13 Corrosion rate of carbon steel in seawater 9.14 Cast irons 9.15 Ductile and cast iron pipes 9.16 Stainless steels 9.17 Corrosion behavior of copper and copper alloys 9.18 Corrosion resistance of copper-base alloys in seawater 9.19 Aluminum and its alloys 9.20 Nickel and its alloys 9.21 Titanium and its alloys Questions References