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Quite simply, can the individual joints and/or limbs of an Iron Golem (or any other metallic golem) be disabled or otherwise immobilized? Disable Device or Molecular Bonding would seem the two most likely methods.
Official WotC d20 sources are viable for my purposes as well.
There are lots of ways to immobilize creatures. For example a web spell does not allow spell resistance, so it will affect an iron golem normally. An alchemical tanglefoot bag will immobilize a creature on a failed save. There's also the traditional approach of grappling the golem (or summoning a monster to grapple the golem for you).
None of these methods are specifically targeted at a golem's limbs. I'm not aware of any official rules for targeting limbs; there appears to be a third-party supplement called Torn Asunder: Critical Hits which has rules for this, but I haven't read it.
If you can grapple and pin the golem, you might try gluing its arms together using sovereign glue. Some DMs might require that the golem be helpless for this to work (rather than merely pinned) but others might allow it.
I don't think Disable Device is a good approach here. Even if the DM allows you to treat a golem as a "device", the disable check would require at least 2d4 rounds, and it's probably not possible to make the check while the golem is moving around.
