Yes, aluminum can oxidize over time, especially in coastal/saltwater environments. In normal outdoor use, the oxidation is usually cosmetic and slow, but galvanic corrosion between aluminum and stainless can occur in harsh wet/salty conditions.
For maximum long-term durability outdoors or near the ocean, many users upgrade to 316 stainless steel crimp sleeves/fittings instead of aluminum.
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The swage/crimp sleeves included in this kit are typically aluminum alloy, while the cable itself is 304 stainless steel. Aluminum sleeves are commonly used with stainless wire rope for light-to-medium duty applications like deck railings and garden trellises.
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