Tudor Black Bay Bronze Bezel Corrosion Problem

Key Points from the Discussion

• The bezel inlay issue on the Tudor Black Bay Bronze is a classic example of galvanic corrosion, where two dissimilar metals (aluminum inlay and bronze case) in contact with an electrolyte like salt water cause the more reactive metal (aluminum) to corrode rapidly.
• Aluminum's natural corrosion resistance is compromised in high-chloride environments or when in direct contact with noble metals like copper oxide (from bronze), leading to a rapid oxidation-reduction reaction that forms aluminum oxide, seen as black spots and holes.
• Tudor should consider using alternative inlay materials like ceramic or a solid engraved bronze bezel, similar to Panerai or Oris, to prevent galvanic corrosion, and a product recall might be necessary given the widespread nature of the problem.
• The bronze alloy used in the Black Bay Bronze is likely CuAl10Fe3, chosen for its strength, corrosion resistance (for a copper alloy), and aesthetic balance, but it's still less resistant to saltwater corrosion than high-chromium stainless steels.
• The problem is likely due to the corroding bronze underneath the bezel disc affecting the disc itself, as bronze is not inherently corrosion-resistant, especially to acidic or alkaline substances found on human skin.
• While some owners have reported pristine Black Bay Bronze watches with a lovely patina even after extensive use in various conditions, the issue of salt water causing corrosion is a significant concern for a diver's watch.