Abstract

The atmospheric corrosion of mild steel is an extensive topic that has been studied by many authors in different regions throughout the world. This compilation paper incorporates relevant publications on the subject, in particular about the nature of atmospheric corrosion products, mechanisms of atmospheric corrosion and kinetics of the atmospheric corrosion process, paying special attention to two matters upon which relatively less information has been published: a) the morphology of steel corrosion products and corrosion product layers; and b) long-term atmospheric corrosion ( > 10 years).

Highlights

  • Nature of atmospheric corrosion productsIn addition to the above compounds, iron can form a number of different substances and be found in other minerals, some of which contain sulphur and can play a significant role in corrosion in urban and industrial atmospheres

  • La corrosión atmosférica del acero suave es un tema de gran amplitud que ha sido tratado por muchos autores en numerosas regiones del mundo

  • An aspect that has been relatively less studied is the morphology of the corrosion products that grow on the steel surface in the form of thin or thick films

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Summary

Nature of atmospheric corrosion products

In addition to the above compounds, iron can form a number of different substances and be found in other minerals, some of which contain sulphur and can play a significant role in corrosion in urban and industrial atmospheres. Such compounds include iron(II) sulphur heptahydrate (melanterite), tetrahydrate (rozenite) or monohydrate; and iron(III) sulphate or Fe(SO ). Iron chlorides and sulphates, which are soluble, are leached from the corrosion product layer by the action of rainwater, and their low residual concentration in the corrosion product layer makes them hard to detect

Dependence on environmental conditions
Morphology
MecHaNiSMS OF atMOSPHeric cOrrOSiON
Evans‘ model
Misawa’s model
Stratmann’s model
Schikorr’s model
Atmospheres polluted with SO2
Atmospheres polluted with chlorides
Nature of corrosion products
Morphology of corrosion layers
Stratification of the rust layer
Prediction of corrosion rates
Findings
FiNal cONSiDeratiONS

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