ChemInform Abstract: Initial Stages of Copper Corrosion in Humid Air Containing SO2 and NO2.
Abstract
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ChemInform Abstract
The presence of NO2 in humid air containing SO2 results in a considerable increase of corrosion of copper surfaces. This is due to the oxidation of SO2 by NO2 to form an acid sulfate electrolyte together with HNO2(g). By the acid sulfate the passivating Cu2O film is attacked and an electrochemical corrosion process starts. The redox reaction of SO2 and NO2 takes place only at high relative humidity (90% ). Significant amounts of S(IV)-O species are identified on the Cu surface after exposition to low SO2 concentrations, the nature of which is still unresolved. Several corrosion products are identified.
