Corrosion is the most dangerous enemy of historic iron and steel structures. After a general introduction to the structural engineering aspects of corrosion, this paper will focus on the relation between corrosion and structural detailing. To provide insight into the most sensitive aspects in and around renovation and restoration and to be able to take adequate measures it is necessary to have some knowledge of the various types of corrosion. Cast iron, wrought iron and various types of steel behave differently from each other. Close attention should be paid to corrosion, especially in the places where different types of metal are in contact with each other. External factors such as relative humidity and air pollution also play a role. Usually corrosion is promoted by inadequate structural detailing because in earlier times little was known about this process. A summary of a number of important errors is presented. It may be necessary to carry out modifications during restoration or renovation. As many structures are important for historical and cultural reasons, adaptations should always be made in an honest and sympathetic way.
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