Bronze disease
Bronze disease is an irreversible and nearly inexorable corrosion process that occurs when chlorides come into contact with bronze or other copper-bearing alloys . 
<triplet> Bronze disease <subj> corrosion <obj> instance of <subj> chloride <obj> has cause <subj> bronze <obj> made from material <triplet> bronze <subj> copper-bearing alloys <obj> subclass of