Metal diagnosis of heritage objects is a difficult task performed by conservators, mainly due to the fact that invasive techniques are not allowed on these artifacts. Therefore, conservators have developed diagnosis methods based on the observation of the corrosion forms of the objects. However, although these methods are useful to share a common representation of one specific object, they are very difficult to use to compare or search for objects presenting similar corrosion forms. To support the comparison of different objects, we propose a new support system built upon these methods. This paper presents an innovative way to use C-K theory in order to build an artifact in an interdisciplinary context. The resulting artifact integrates concepts and knowledge borrowed from both the conservation-restoration and the information systems fields.