"Anodizing creates an oxide layer around the metal to protect it from unsightly scratches, but it has limitations. Aluminum isn't quite as good as titanium at building an anodized layer, but the design makes matters worse. The sharp edges of the raised camera mount make the layer of oxidized material more susceptible to being scratched off, and its aluminum base makes the oxide layer more brittle."
"Owners of Apple's iPhone 17 Pro and Pro Max have been reporting that the shell of their pricey handsets is getting scratched up already, and the reason appears to be a shift to aluminum. The two handsets introduced at Apple's annual iPhone marketing event in September featured an anodized aluminum shell, rather than the titanium frame Apple has used in some past models."
Owners of iPhone 17 Pro and Pro Max units report early scratching on the handset shells, concentrated around the raised camera mounting on the rear. The two handsets use an anodized aluminum shell instead of the titanium frame used in some past models. Microscopic investigation by repairers shows the anodized oxide layer on aluminum is more brittle and more easily scratched off at the camera's sharp edge. The rest of the handset has smoother corners and is less prone to damage. Industry sources suggest geopolitical and supply issues with titanium influenced the material change.
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