Originally Posted by
grumpus
Using a chain in salty conditions, you need to regularly wash off the salt, displace/dry remaining moisture and add lubricant.
The OP had a failure due to lack of maintenance. And among these three pages of discussing chain construction and what to use to remove rust, grumpus has the countermeasure for the root cause of the problem.
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"It is the unknown around the corner that turns my wheels." -- Heinz Stücke