DISSOLVING AND REMOVING COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a dissolving and removing composition that has excellent dissolution rates of rust and scale and can also inhibit the corrosion of a metal matrix.SOLUTION: A dissolving and removing composition has (A) a base compound comprising phosphonic acid chelator of 0.1 mass% or more and 30 mass% or less and (B) a dissolution promoter comprising iron oxide having divalent iron of 0.010 mass% or more.SELECTED DRAWING: None