My knowledge of inorganic chem is lacking, but my guess is that the sodium hypochlorite oxidizes the copper.
In any case, water/NaOCl is extremely corrosive to metals. So far as I know, industrial chlorine separations plants keep water content very low, or else need to build pipes out of expensive superalloys.
And just in case you have no idea what you're doing, for God's sake, don't put ammonia and bleach in there together.
Alchemy
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