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Light microscopy, scanning electron microscopy and energy dispersive X-ray analysis were employed to identify the key factors responsible for the crevice-galvanic corrosion of shower curtain poles produced from EN AW-6060 alloy. The corrosion process has started between the aluminium poles and the metallized plastic hooks used to hang the shower curtains on the poles. The highly alkaline bathroom cleaning agent has penetrated between the aluminium profile and the plastic hooks leading to the dissolution of the unusually thin anodic oxide layer. The aluminium profile which has been stripped of its anodic oxide locally via crevice corrosion is then allowed to contact the Ni-, Cr- and Cubearing coating of the plastic hooks. The corrosion process has accelerated due to a galvanic couple effect as evidenced by the analysis of the corroded regions where Cu and Ni were abundant.

Crevice-Galvanic Corrosion in Aluminium Shower Curtain Poles