The authors consider the case of iron atmospheric corrosion to illustrate the possibility of developing a conservation diagnosis for a given material in a given environment. In the particular case of iron atmospheric corrosion, samples from the site of the Amiens Cathedral in the North of France have been characterised in order to identify the different phases constituting the corrosion product layers. The layers consist of a matrix of iron oxy-hydroxide goethite embedded with several ferrihydrite marblings. Other phases such as as lepidocrocite, maghemite and akaganeite are present in minor quantities. A degradation index is first defined from the phase proportions and from the intrinsic electrochemical properties of those phases. Further, the electrochemical reactivity of scratched rust powders has been studied to define a second degradation index. From these two degradation indices a first step towards a corrosion diagnosis method is proposed.
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