Non-carcinogenic, non-polluting sulfuric acid etchants for preparing aluminum surfaces for adhesive bonding

摘要

The invention provides a process and composition of low toxicity for preparing aluminum surfaces for adhesive bonding. According to the invention non-carcinogenic, non-polluting soluble metal salts generally, other than ferric sulfate disclosed in U.S. Pat. No. 4,212,701, when added in an effective amount to sulfuric acid, improve the adhesive bonding to aluminum when the aluminum is treated with such salt-sulfuric acid etchants prior to adhesive bonding.