Etchants for glass films on metal substrates

摘要

An aqueous solution for etching a glass layer on a metal (aluminum) substrate without substantial attack on the metal. The solution comprises buffered hydrofluoric acid, sodium chloride, and either (a) a fluorocarbon surfactant capable of forming a protective thin film upon the aluminum, or (b) a 6-hydroxy alcohol (e.g., mannitol or sorbitol).