Corrosion can cause unwanted degradation in metallic products or machine equipment, resulting in defects. Or it may simply be visually undesirable. In order to better assess corrosion and the specific mechanism by which it occurs, it is advantageous to understand the chemical process down to the smallest details – both in terms of speed and the compounds found. X-ray techniques can help map this process. They offer supporting insights at atomic and microscopic level that may aid solution strategies to counter corrosion and obtain more durable products.